Greg Kroah-Hartman | b244131 | 2017-11-01 15:07:57 +0100 | [diff] [blame] | 1 | // SPDX-License-Identifier: GPL-2.0 |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 2 | #include <linux/mm.h> |
Davidlohr Bueso | 615d6e8 | 2014-04-07 15:37:25 -0700 | [diff] [blame] | 3 | #include <linux/vmacache.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | #include <linux/hugetlb.h> |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 5 | #include <linux/huge_mm.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 6 | #include <linux/mount.h> |
| 7 | #include <linux/seq_file.h> |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 8 | #include <linux/highmem.h> |
Kees Cook | 5096add | 2007-05-08 00:26:04 -0700 | [diff] [blame] | 9 | #include <linux/ptrace.h> |
Tejun Heo | 5a0e3ad | 2010-03-24 17:04:11 +0900 | [diff] [blame] | 10 | #include <linux/slab.h> |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 11 | #include <linux/pagemap.h> |
| 12 | #include <linux/mempolicy.h> |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 13 | #include <linux/rmap.h> |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 14 | #include <linux/swap.h> |
Ingo Molnar | 6e84f31 | 2017-02-08 18:51:29 +0100 | [diff] [blame] | 15 | #include <linux/sched/mm.h> |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 16 | #include <linux/swapops.h> |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 17 | #include <linux/mmu_notifier.h> |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 18 | #include <linux/page_idle.h> |
Vlastimil Babka | 6a15a37 | 2016-01-14 15:19:20 -0800 | [diff] [blame] | 19 | #include <linux/shmem_fs.h> |
Minchan Kim | b3a81d0 | 2017-08-10 15:24:15 -0700 | [diff] [blame] | 20 | #include <linux/uaccess.h> |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 21 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <asm/elf.h> |
Minchan Kim | b3a81d0 | 2017-08-10 15:24:15 -0700 | [diff] [blame] | 23 | #include <asm/tlb.h> |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 24 | #include <asm/tlbflush.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 25 | #include "internal.h" |
| 26 | |
Andrei Vagin | d1be35c | 2018-04-10 16:31:16 -0700 | [diff] [blame^] | 27 | #define SEQ_PUT_DEC(str, val) \ |
| 28 | seq_put_decimal_ull_width(m, str, (val) << (PAGE_SHIFT-10), 8) |
Eric W. Biederman | df5f831 | 2008-02-08 04:18:33 -0800 | [diff] [blame] | 29 | void task_mem(struct seq_file *m, struct mm_struct *mm) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | { |
Kirill A. Shutemov | af5b0f6 | 2017-11-15 17:35:40 -0800 | [diff] [blame] | 31 | unsigned long text, lib, swap, anon, file, shmem; |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 32 | unsigned long hiwater_vm, total_vm, hiwater_rss, total_rss; |
| 33 | |
Jerome Marchand | 8cee852 | 2016-01-14 15:19:29 -0800 | [diff] [blame] | 34 | anon = get_mm_counter(mm, MM_ANONPAGES); |
| 35 | file = get_mm_counter(mm, MM_FILEPAGES); |
| 36 | shmem = get_mm_counter(mm, MM_SHMEMPAGES); |
| 37 | |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 38 | /* |
| 39 | * Note: to minimize their overhead, mm maintains hiwater_vm and |
| 40 | * hiwater_rss only when about to *lower* total_vm or rss. Any |
| 41 | * collector of these hiwater stats must therefore get total_vm |
| 42 | * and rss too, which will usually be the higher. Barriers? not |
| 43 | * worth the effort, such snapshots can always be inconsistent. |
| 44 | */ |
| 45 | hiwater_vm = total_vm = mm->total_vm; |
| 46 | if (hiwater_vm < mm->hiwater_vm) |
| 47 | hiwater_vm = mm->hiwater_vm; |
Jerome Marchand | 8cee852 | 2016-01-14 15:19:29 -0800 | [diff] [blame] | 48 | hiwater_rss = total_rss = anon + file + shmem; |
Hugh Dickins | 365e9c87 | 2005-10-29 18:16:18 -0700 | [diff] [blame] | 49 | if (hiwater_rss < mm->hiwater_rss) |
| 50 | hiwater_rss = mm->hiwater_rss; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 51 | |
Konstantin Khlebnikov | 8526d84 | 2018-01-31 16:17:22 -0800 | [diff] [blame] | 52 | /* split executable areas between text and lib */ |
| 53 | text = PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK); |
| 54 | text = min(text, mm->exec_vm << PAGE_SHIFT); |
| 55 | lib = (mm->exec_vm << PAGE_SHIFT) - text; |
| 56 | |
KAMEZAWA Hiroyuki | b084d43 | 2010-03-05 13:41:42 -0800 | [diff] [blame] | 57 | swap = get_mm_counter(mm, MM_SWAPENTS); |
Andrei Vagin | d1be35c | 2018-04-10 16:31:16 -0700 | [diff] [blame^] | 58 | SEQ_PUT_DEC("VmPeak:\t", hiwater_vm); |
| 59 | SEQ_PUT_DEC(" kB\nVmSize:\t", total_vm); |
| 60 | SEQ_PUT_DEC(" kB\nVmLck:\t", mm->locked_vm); |
| 61 | SEQ_PUT_DEC(" kB\nVmPin:\t", mm->pinned_vm); |
| 62 | SEQ_PUT_DEC(" kB\nVmHWM:\t", hiwater_rss); |
| 63 | SEQ_PUT_DEC(" kB\nVmRSS:\t", total_rss); |
| 64 | SEQ_PUT_DEC(" kB\nRssAnon:\t", anon); |
| 65 | SEQ_PUT_DEC(" kB\nRssFile:\t", file); |
| 66 | SEQ_PUT_DEC(" kB\nRssShmem:\t", shmem); |
| 67 | SEQ_PUT_DEC(" kB\nVmData:\t", mm->data_vm); |
| 68 | SEQ_PUT_DEC(" kB\nVmStk:\t", mm->stack_vm); |
| 69 | seq_put_decimal_ull_width(m, |
| 70 | " kB\nVmExe:\t", text >> 10, 8); |
| 71 | seq_put_decimal_ull_width(m, |
| 72 | " kB\nVmLib:\t", lib >> 10, 8); |
| 73 | seq_put_decimal_ull_width(m, |
| 74 | " kB\nVmPTE:\t", mm_pgtables_bytes(mm) >> 10, 8); |
| 75 | SEQ_PUT_DEC(" kB\nVmSwap:\t", swap); |
| 76 | seq_puts(m, " kB\n"); |
Naoya Horiguchi | 5d317b2 | 2015-11-05 18:47:14 -0800 | [diff] [blame] | 77 | hugetlb_report_usage(m, mm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 78 | } |
Andrei Vagin | d1be35c | 2018-04-10 16:31:16 -0700 | [diff] [blame^] | 79 | #undef SEQ_PUT_DEC |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 80 | |
| 81 | unsigned long task_vsize(struct mm_struct *mm) |
| 82 | { |
| 83 | return PAGE_SIZE * mm->total_vm; |
| 84 | } |
| 85 | |
Alexey Dobriyan | a2ade7b | 2011-01-12 17:00:32 -0800 | [diff] [blame] | 86 | unsigned long task_statm(struct mm_struct *mm, |
| 87 | unsigned long *shared, unsigned long *text, |
| 88 | unsigned long *data, unsigned long *resident) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 89 | { |
Jerome Marchand | eca56ff | 2016-01-14 15:19:26 -0800 | [diff] [blame] | 90 | *shared = get_mm_counter(mm, MM_FILEPAGES) + |
| 91 | get_mm_counter(mm, MM_SHMEMPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | *text = (PAGE_ALIGN(mm->end_code) - (mm->start_code & PAGE_MASK)) |
| 93 | >> PAGE_SHIFT; |
Konstantin Khlebnikov | 8463833 | 2016-01-14 15:22:07 -0800 | [diff] [blame] | 94 | *data = mm->data_vm + mm->stack_vm; |
KAMEZAWA Hiroyuki | d559db0 | 2010-03-05 13:41:39 -0800 | [diff] [blame] | 95 | *resident = *shared + get_mm_counter(mm, MM_ANONPAGES); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 96 | return mm->total_vm; |
| 97 | } |
| 98 | |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 99 | #ifdef CONFIG_NUMA |
| 100 | /* |
Oleg Nesterov | 498f237 | 2014-10-09 15:27:52 -0700 | [diff] [blame] | 101 | * Save get_task_policy() for show_numa_map(). |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 102 | */ |
| 103 | static void hold_task_mempolicy(struct proc_maps_private *priv) |
| 104 | { |
| 105 | struct task_struct *task = priv->task; |
| 106 | |
| 107 | task_lock(task); |
Oleg Nesterov | 498f237 | 2014-10-09 15:27:52 -0700 | [diff] [blame] | 108 | priv->task_mempolicy = get_task_policy(task); |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 109 | mpol_get(priv->task_mempolicy); |
| 110 | task_unlock(task); |
| 111 | } |
| 112 | static void release_task_mempolicy(struct proc_maps_private *priv) |
| 113 | { |
| 114 | mpol_put(priv->task_mempolicy); |
| 115 | } |
| 116 | #else |
| 117 | static void hold_task_mempolicy(struct proc_maps_private *priv) |
| 118 | { |
| 119 | } |
| 120 | static void release_task_mempolicy(struct proc_maps_private *priv) |
| 121 | { |
| 122 | } |
| 123 | #endif |
| 124 | |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 125 | static void vma_stop(struct proc_maps_private *priv) |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 126 | { |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 127 | struct mm_struct *mm = priv->mm; |
| 128 | |
| 129 | release_task_mempolicy(priv); |
| 130 | up_read(&mm->mmap_sem); |
| 131 | mmput(mm); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 132 | } |
| 133 | |
Oleg Nesterov | ad2a00e | 2014-10-09 15:25:39 -0700 | [diff] [blame] | 134 | static struct vm_area_struct * |
| 135 | m_next_vma(struct proc_maps_private *priv, struct vm_area_struct *vma) |
| 136 | { |
| 137 | if (vma == priv->tail_vma) |
| 138 | return NULL; |
| 139 | return vma->vm_next ?: priv->tail_vma; |
| 140 | } |
| 141 | |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 142 | static void m_cache_vma(struct seq_file *m, struct vm_area_struct *vma) |
| 143 | { |
| 144 | if (m->count < m->size) /* vma is copied successfully */ |
Robert Ho | 855af07 | 2016-10-07 17:02:36 -0700 | [diff] [blame] | 145 | m->version = m_next_vma(m->private, vma) ? vma->vm_end : -1UL; |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 146 | } |
| 147 | |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 148 | static void *m_start(struct seq_file *m, loff_t *ppos) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 149 | { |
| 150 | struct proc_maps_private *priv = m->private; |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 151 | unsigned long last_addr = m->version; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 152 | struct mm_struct *mm; |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 153 | struct vm_area_struct *vma; |
| 154 | unsigned int pos = *ppos; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 155 | |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 156 | /* See m_cache_vma(). Zero at the start or after lseek. */ |
| 157 | if (last_addr == -1UL) |
| 158 | return NULL; |
| 159 | |
Oleg Nesterov | 2c03376 | 2014-10-09 15:25:51 -0700 | [diff] [blame] | 160 | priv->task = get_proc_task(priv->inode); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 161 | if (!priv->task) |
Al Viro | ec6fd8a | 2011-02-15 22:22:54 -0500 | [diff] [blame] | 162 | return ERR_PTR(-ESRCH); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 163 | |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 164 | mm = priv->mm; |
Vegard Nossum | 388f793 | 2017-02-27 14:30:13 -0800 | [diff] [blame] | 165 | if (!mm || !mmget_not_zero(mm)) |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 166 | return NULL; |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 167 | |
Oleg Nesterov | 00f89d2 | 2009-07-10 03:27:38 +0200 | [diff] [blame] | 168 | down_read(&mm->mmap_sem); |
KAMEZAWA Hiroyuki | 9e78144 | 2012-10-19 17:00:55 +0900 | [diff] [blame] | 169 | hold_task_mempolicy(priv); |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 170 | priv->tail_vma = get_gate_vma(mm); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 171 | |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 172 | if (last_addr) { |
Robert Ho | 855af07 | 2016-10-07 17:02:36 -0700 | [diff] [blame] | 173 | vma = find_vma(mm, last_addr - 1); |
| 174 | if (vma && vma->vm_start <= last_addr) |
| 175 | vma = m_next_vma(priv, vma); |
| 176 | if (vma) |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 177 | return vma; |
| 178 | } |
| 179 | |
| 180 | m->version = 0; |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 181 | if (pos < mm->map_count) { |
Oleg Nesterov | 557c2d8 | 2014-10-09 15:25:43 -0700 | [diff] [blame] | 182 | for (vma = mm->mmap; pos; pos--) { |
| 183 | m->version = vma->vm_start; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 184 | vma = vma->vm_next; |
Oleg Nesterov | 557c2d8 | 2014-10-09 15:25:43 -0700 | [diff] [blame] | 185 | } |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 186 | return vma; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 187 | } |
| 188 | |
Oleg Nesterov | 557c2d8 | 2014-10-09 15:25:43 -0700 | [diff] [blame] | 189 | /* we do not bother to update m->version in this case */ |
Oleg Nesterov | 0c25532 | 2014-10-09 15:25:36 -0700 | [diff] [blame] | 190 | if (pos == mm->map_count && priv->tail_vma) |
| 191 | return priv->tail_vma; |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 192 | |
| 193 | vma_stop(priv); |
| 194 | return NULL; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 195 | } |
| 196 | |
| 197 | static void *m_next(struct seq_file *m, void *v, loff_t *pos) |
| 198 | { |
| 199 | struct proc_maps_private *priv = m->private; |
Oleg Nesterov | ad2a00e | 2014-10-09 15:25:39 -0700 | [diff] [blame] | 200 | struct vm_area_struct *next; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 201 | |
| 202 | (*pos)++; |
Oleg Nesterov | ad2a00e | 2014-10-09 15:25:39 -0700 | [diff] [blame] | 203 | next = m_next_vma(priv, v); |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 204 | if (!next) |
| 205 | vma_stop(priv); |
| 206 | return next; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 207 | } |
| 208 | |
| 209 | static void m_stop(struct seq_file *m, void *v) |
| 210 | { |
| 211 | struct proc_maps_private *priv = m->private; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 212 | |
Oleg Nesterov | 59b4bf1 | 2014-10-09 15:25:28 -0700 | [diff] [blame] | 213 | if (!IS_ERR_OR_NULL(v)) |
| 214 | vma_stop(priv); |
Oleg Nesterov | 0d5f5f4 | 2014-10-09 15:25:32 -0700 | [diff] [blame] | 215 | if (priv->task) { |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 216 | put_task_struct(priv->task); |
Oleg Nesterov | 0d5f5f4 | 2014-10-09 15:25:32 -0700 | [diff] [blame] | 217 | priv->task = NULL; |
| 218 | } |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 219 | } |
| 220 | |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 221 | static int proc_maps_open(struct inode *inode, struct file *file, |
| 222 | const struct seq_operations *ops, int psize) |
| 223 | { |
| 224 | struct proc_maps_private *priv = __seq_open_private(file, ops, psize); |
| 225 | |
| 226 | if (!priv) |
| 227 | return -ENOMEM; |
| 228 | |
Oleg Nesterov | 2c03376 | 2014-10-09 15:25:51 -0700 | [diff] [blame] | 229 | priv->inode = inode; |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 230 | priv->mm = proc_mem_open(inode, PTRACE_MODE_READ); |
| 231 | if (IS_ERR(priv->mm)) { |
| 232 | int err = PTR_ERR(priv->mm); |
| 233 | |
| 234 | seq_release_private(inode, file); |
| 235 | return err; |
| 236 | } |
| 237 | |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 238 | return 0; |
| 239 | } |
| 240 | |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 241 | static int proc_map_release(struct inode *inode, struct file *file) |
| 242 | { |
| 243 | struct seq_file *seq = file->private_data; |
| 244 | struct proc_maps_private *priv = seq->private; |
| 245 | |
| 246 | if (priv->mm) |
| 247 | mmdrop(priv->mm); |
| 248 | |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 249 | kfree(priv->rollup); |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 250 | return seq_release_private(inode, file); |
| 251 | } |
| 252 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 253 | static int do_maps_open(struct inode *inode, struct file *file, |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 254 | const struct seq_operations *ops) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 255 | { |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 256 | return proc_maps_open(inode, file, ops, |
| 257 | sizeof(struct proc_maps_private)); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 258 | } |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 259 | |
Johannes Weiner | 65376df | 2016-02-02 16:57:29 -0800 | [diff] [blame] | 260 | /* |
| 261 | * Indicate if the VMA is a stack for the given task; for |
| 262 | * /proc/PID/maps that is the stack of the main task. |
| 263 | */ |
Michal Hocko | 1240ea0 | 2017-09-08 16:13:35 -0700 | [diff] [blame] | 264 | static int is_stack(struct vm_area_struct *vma) |
Oleg Nesterov | 58cb654 | 2014-10-09 15:25:54 -0700 | [diff] [blame] | 265 | { |
Andy Lutomirski | b18cb64 | 2016-09-30 10:58:57 -0700 | [diff] [blame] | 266 | /* |
| 267 | * We make no effort to guess what a given thread considers to be |
| 268 | * its "stack". It's not even well-defined for programs written |
| 269 | * languages like Go. |
| 270 | */ |
| 271 | return vma->vm_start <= vma->vm_mm->start_stack && |
| 272 | vma->vm_end >= vma->vm_mm->start_stack; |
Oleg Nesterov | 58cb654 | 2014-10-09 15:25:54 -0700 | [diff] [blame] | 273 | } |
| 274 | |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 275 | static void show_vma_header_prefix(struct seq_file *m, |
| 276 | unsigned long start, unsigned long end, |
| 277 | vm_flags_t flags, unsigned long long pgoff, |
| 278 | dev_t dev, unsigned long ino) |
| 279 | { |
| 280 | seq_setwidth(m, 25 + sizeof(void *) * 6 - 1); |
Andrei Vagin | 0e3dc01 | 2018-04-10 16:30:44 -0700 | [diff] [blame] | 281 | seq_put_hex_ll(m, NULL, start, 8); |
| 282 | seq_put_hex_ll(m, "-", end, 8); |
| 283 | seq_putc(m, ' '); |
| 284 | seq_putc(m, flags & VM_READ ? 'r' : '-'); |
| 285 | seq_putc(m, flags & VM_WRITE ? 'w' : '-'); |
| 286 | seq_putc(m, flags & VM_EXEC ? 'x' : '-'); |
| 287 | seq_putc(m, flags & VM_MAYSHARE ? 's' : 'p'); |
| 288 | seq_put_hex_ll(m, " ", pgoff, 8); |
| 289 | seq_put_hex_ll(m, " ", MAJOR(dev), 2); |
| 290 | seq_put_hex_ll(m, ":", MINOR(dev), 2); |
| 291 | seq_put_decimal_ull(m, " ", ino); |
| 292 | seq_putc(m, ' '); |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 293 | } |
| 294 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 295 | static void |
| 296 | show_map_vma(struct seq_file *m, struct vm_area_struct *vma, int is_pid) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 297 | { |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 298 | struct mm_struct *mm = vma->vm_mm; |
| 299 | struct file *file = vma->vm_file; |
KOSAKI Motohiro | ca16d14 | 2011-05-26 19:16:19 +0900 | [diff] [blame] | 300 | vm_flags_t flags = vma->vm_flags; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | unsigned long ino = 0; |
KAMEZAWA Hiroyuki | 6260a4b | 2009-04-06 19:00:30 -0700 | [diff] [blame] | 302 | unsigned long long pgoff = 0; |
Mikulas Patocka | a09a79f | 2011-05-09 13:01:09 +0200 | [diff] [blame] | 303 | unsigned long start, end; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | dev_t dev = 0; |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 305 | const char *name = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 306 | |
| 307 | if (file) { |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 308 | struct inode *inode = file_inode(vma->vm_file); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | dev = inode->i_sb->s_dev; |
| 310 | ino = inode->i_ino; |
KAMEZAWA Hiroyuki | 6260a4b | 2009-04-06 19:00:30 -0700 | [diff] [blame] | 311 | pgoff = ((loff_t)vma->vm_pgoff) << PAGE_SHIFT; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 312 | } |
| 313 | |
Linus Torvalds | d782437 | 2010-08-15 11:35:52 -0700 | [diff] [blame] | 314 | start = vma->vm_start; |
Mikulas Patocka | a09a79f | 2011-05-09 13:01:09 +0200 | [diff] [blame] | 315 | end = vma->vm_end; |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 316 | show_vma_header_prefix(m, start, end, flags, pgoff, dev, ino); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 317 | |
| 318 | /* |
| 319 | * Print the dentry name for named mappings, and a |
| 320 | * special [heap] marker for the heap: |
| 321 | */ |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 322 | if (file) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 323 | seq_pad(m, ' '); |
Miklos Szeredi | 2726d56 | 2015-06-19 10:30:28 +0200 | [diff] [blame] | 324 | seq_file_path(m, file, "\n"); |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 325 | goto done; |
| 326 | } |
| 327 | |
Andy Lutomirski | 78d683e | 2014-05-19 15:58:32 -0700 | [diff] [blame] | 328 | if (vma->vm_ops && vma->vm_ops->name) { |
| 329 | name = vma->vm_ops->name(vma); |
| 330 | if (name) |
| 331 | goto done; |
| 332 | } |
| 333 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 334 | name = arch_vma_name(vma); |
| 335 | if (!name) { |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 336 | if (!mm) { |
| 337 | name = "[vdso]"; |
| 338 | goto done; |
| 339 | } |
| 340 | |
| 341 | if (vma->vm_start <= mm->brk && |
| 342 | vma->vm_end >= mm->start_brk) { |
| 343 | name = "[heap]"; |
| 344 | goto done; |
| 345 | } |
| 346 | |
Michal Hocko | 1240ea0 | 2017-09-08 16:13:35 -0700 | [diff] [blame] | 347 | if (is_stack(vma)) |
Johannes Weiner | 65376df | 2016-02-02 16:57:29 -0800 | [diff] [blame] | 348 | name = "[stack]"; |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 349 | } |
| 350 | |
| 351 | done: |
| 352 | if (name) { |
Tetsuo Handa | 652586d | 2013-11-14 14:31:57 -0800 | [diff] [blame] | 353 | seq_pad(m, ' '); |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 354 | seq_puts(m, name); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 355 | } |
| 356 | seq_putc(m, '\n'); |
Joe Korty | 7c88db0 | 2008-10-16 15:27:09 +0400 | [diff] [blame] | 357 | } |
| 358 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 359 | static int show_map(struct seq_file *m, void *v, int is_pid) |
Joe Korty | 7c88db0 | 2008-10-16 15:27:09 +0400 | [diff] [blame] | 360 | { |
Oleg Nesterov | ebb6cdd | 2014-10-09 15:25:34 -0700 | [diff] [blame] | 361 | show_map_vma(m, v, is_pid); |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 362 | m_cache_vma(m, v); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 363 | return 0; |
| 364 | } |
| 365 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 366 | static int show_pid_map(struct seq_file *m, void *v) |
| 367 | { |
| 368 | return show_map(m, v, 1); |
| 369 | } |
| 370 | |
| 371 | static int show_tid_map(struct seq_file *m, void *v) |
| 372 | { |
| 373 | return show_map(m, v, 0); |
| 374 | } |
| 375 | |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 376 | static const struct seq_operations proc_pid_maps_op = { |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 377 | .start = m_start, |
| 378 | .next = m_next, |
| 379 | .stop = m_stop, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 380 | .show = show_pid_map |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 381 | }; |
| 382 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 383 | static const struct seq_operations proc_tid_maps_op = { |
| 384 | .start = m_start, |
| 385 | .next = m_next, |
| 386 | .stop = m_stop, |
| 387 | .show = show_tid_map |
| 388 | }; |
| 389 | |
| 390 | static int pid_maps_open(struct inode *inode, struct file *file) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 391 | { |
| 392 | return do_maps_open(inode, file, &proc_pid_maps_op); |
| 393 | } |
| 394 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 395 | static int tid_maps_open(struct inode *inode, struct file *file) |
| 396 | { |
| 397 | return do_maps_open(inode, file, &proc_tid_maps_op); |
| 398 | } |
| 399 | |
| 400 | const struct file_operations proc_pid_maps_operations = { |
| 401 | .open = pid_maps_open, |
| 402 | .read = seq_read, |
| 403 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 404 | .release = proc_map_release, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 405 | }; |
| 406 | |
| 407 | const struct file_operations proc_tid_maps_operations = { |
| 408 | .open = tid_maps_open, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 409 | .read = seq_read, |
| 410 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 411 | .release = proc_map_release, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 412 | }; |
| 413 | |
| 414 | /* |
| 415 | * Proportional Set Size(PSS): my share of RSS. |
| 416 | * |
| 417 | * PSS of a process is the count of pages it has in memory, where each |
| 418 | * page is divided by the number of processes sharing it. So if a |
| 419 | * process has 1000 pages all to itself, and 1000 shared with one other |
| 420 | * process, its PSS will be 1500. |
| 421 | * |
| 422 | * To keep (accumulated) division errors low, we adopt a 64bit |
| 423 | * fixed-point pss counter to minimize division errors. So (pss >> |
| 424 | * PSS_SHIFT) would be the real byte count. |
| 425 | * |
| 426 | * A shift of 12 before division means (assuming 4K page size): |
| 427 | * - 1M 3-user-pages add up to 8KB errors; |
| 428 | * - supports mapcount up to 2^24, or 16M; |
| 429 | * - supports PSS up to 2^52 bytes, or 4PB. |
| 430 | */ |
| 431 | #define PSS_SHIFT 12 |
| 432 | |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 433 | #ifdef CONFIG_PROC_PAGE_MONITOR |
Peter Zijlstra | 214e471 | 2008-04-28 02:12:55 -0700 | [diff] [blame] | 434 | struct mem_size_stats { |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 435 | bool first; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 436 | unsigned long resident; |
| 437 | unsigned long shared_clean; |
| 438 | unsigned long shared_dirty; |
| 439 | unsigned long private_clean; |
| 440 | unsigned long private_dirty; |
| 441 | unsigned long referenced; |
Nikanth Karthikesan | b40d4f8 | 2010-10-27 15:34:10 -0700 | [diff] [blame] | 442 | unsigned long anonymous; |
Shaohua Li | cf8496e | 2017-05-03 14:52:42 -0700 | [diff] [blame] | 443 | unsigned long lazyfree; |
Dave Hansen | 4031a21 | 2011-03-22 16:33:01 -0700 | [diff] [blame] | 444 | unsigned long anonymous_thp; |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 445 | unsigned long shmem_thp; |
Peter Zijlstra | 214e471 | 2008-04-28 02:12:55 -0700 | [diff] [blame] | 446 | unsigned long swap; |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 447 | unsigned long shared_hugetlb; |
| 448 | unsigned long private_hugetlb; |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 449 | unsigned long first_vma_start; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 450 | u64 pss; |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 451 | u64 pss_locked; |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 452 | u64 swap_pss; |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 453 | bool check_shmem_swap; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 454 | }; |
| 455 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 456 | static void smaps_account(struct mem_size_stats *mss, struct page *page, |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 457 | bool compound, bool young, bool dirty) |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 458 | { |
Kirill A. Shutemov | f4be615 | 2016-01-20 14:58:12 -0800 | [diff] [blame] | 459 | int i, nr = compound ? 1 << compound_order(page) : 1; |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 460 | unsigned long size = nr * PAGE_SIZE; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 461 | |
Shaohua Li | cf8496e | 2017-05-03 14:52:42 -0700 | [diff] [blame] | 462 | if (PageAnon(page)) { |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 463 | mss->anonymous += size; |
Shaohua Li | cf8496e | 2017-05-03 14:52:42 -0700 | [diff] [blame] | 464 | if (!PageSwapBacked(page) && !dirty && !PageDirty(page)) |
| 465 | mss->lazyfree += size; |
| 466 | } |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 467 | |
| 468 | mss->resident += size; |
| 469 | /* Accumulate the size in pages that have been accessed. */ |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 470 | if (young || page_is_young(page) || PageReferenced(page)) |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 471 | mss->referenced += size; |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 472 | |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 473 | /* |
| 474 | * page_count(page) == 1 guarantees the page is mapped exactly once. |
| 475 | * If any subpage of the compound page mapped with PTE it would elevate |
| 476 | * page_count(). |
| 477 | */ |
| 478 | if (page_count(page) == 1) { |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 479 | if (dirty || PageDirty(page)) |
| 480 | mss->private_dirty += size; |
| 481 | else |
| 482 | mss->private_clean += size; |
| 483 | mss->pss += (u64)size << PSS_SHIFT; |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 484 | return; |
| 485 | } |
| 486 | |
| 487 | for (i = 0; i < nr; i++, page++) { |
| 488 | int mapcount = page_mapcount(page); |
| 489 | |
| 490 | if (mapcount >= 2) { |
| 491 | if (dirty || PageDirty(page)) |
| 492 | mss->shared_dirty += PAGE_SIZE; |
| 493 | else |
| 494 | mss->shared_clean += PAGE_SIZE; |
| 495 | mss->pss += (PAGE_SIZE << PSS_SHIFT) / mapcount; |
| 496 | } else { |
| 497 | if (dirty || PageDirty(page)) |
| 498 | mss->private_dirty += PAGE_SIZE; |
| 499 | else |
| 500 | mss->private_clean += PAGE_SIZE; |
| 501 | mss->pss += PAGE_SIZE << PSS_SHIFT; |
| 502 | } |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 503 | } |
| 504 | } |
| 505 | |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 506 | #ifdef CONFIG_SHMEM |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 507 | static int smaps_pte_hole(unsigned long addr, unsigned long end, |
| 508 | struct mm_walk *walk) |
| 509 | { |
| 510 | struct mem_size_stats *mss = walk->private; |
| 511 | |
Vlastimil Babka | 48131e0 | 2016-01-14 15:19:23 -0800 | [diff] [blame] | 512 | mss->swap += shmem_partial_swap_usage( |
| 513 | walk->vma->vm_file->f_mapping, addr, end); |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 514 | |
| 515 | return 0; |
| 516 | } |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 517 | #endif |
| 518 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 519 | static void smaps_pte_entry(pte_t *pte, unsigned long addr, |
| 520 | struct mm_walk *walk) |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 521 | { |
| 522 | struct mem_size_stats *mss = walk->private; |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 523 | struct vm_area_struct *vma = walk->vma; |
Konstantin Khlebnikov | b1d4d9e | 2012-05-31 16:26:20 -0700 | [diff] [blame] | 524 | struct page *page = NULL; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 525 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 526 | if (pte_present(*pte)) { |
| 527 | page = vm_normal_page(vma, addr, *pte); |
| 528 | } else if (is_swap_pte(*pte)) { |
| 529 | swp_entry_t swpent = pte_to_swp_entry(*pte); |
Konstantin Khlebnikov | b1d4d9e | 2012-05-31 16:26:20 -0700 | [diff] [blame] | 530 | |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 531 | if (!non_swap_entry(swpent)) { |
| 532 | int mapcount; |
| 533 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 534 | mss->swap += PAGE_SIZE; |
Minchan Kim | 8334b96 | 2015-09-08 15:00:24 -0700 | [diff] [blame] | 535 | mapcount = swp_swapcount(swpent); |
| 536 | if (mapcount >= 2) { |
| 537 | u64 pss_delta = (u64)PAGE_SIZE << PSS_SHIFT; |
| 538 | |
| 539 | do_div(pss_delta, mapcount); |
| 540 | mss->swap_pss += pss_delta; |
| 541 | } else { |
| 542 | mss->swap_pss += (u64)PAGE_SIZE << PSS_SHIFT; |
| 543 | } |
| 544 | } else if (is_migration_entry(swpent)) |
Konstantin Khlebnikov | b1d4d9e | 2012-05-31 16:26:20 -0700 | [diff] [blame] | 545 | page = migration_entry_to_page(swpent); |
Jérôme Glisse | 5042db4 | 2017-09-08 16:11:43 -0700 | [diff] [blame] | 546 | else if (is_device_private_entry(swpent)) |
| 547 | page = device_private_entry_to_page(swpent); |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 548 | } else if (unlikely(IS_ENABLED(CONFIG_SHMEM) && mss->check_shmem_swap |
| 549 | && pte_none(*pte))) { |
Vlastimil Babka | 48131e0 | 2016-01-14 15:19:23 -0800 | [diff] [blame] | 550 | page = find_get_entry(vma->vm_file->f_mapping, |
| 551 | linear_page_index(vma, addr)); |
| 552 | if (!page) |
| 553 | return; |
| 554 | |
| 555 | if (radix_tree_exceptional_entry(page)) |
| 556 | mss->swap += PAGE_SIZE; |
| 557 | else |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 558 | put_page(page); |
Vlastimil Babka | 48131e0 | 2016-01-14 15:19:23 -0800 | [diff] [blame] | 559 | |
| 560 | return; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 561 | } |
| 562 | |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 563 | if (!page) |
| 564 | return; |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 565 | |
| 566 | smaps_account(mss, page, false, pte_young(*pte), pte_dirty(*pte)); |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 567 | } |
| 568 | |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 569 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 570 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, |
| 571 | struct mm_walk *walk) |
| 572 | { |
| 573 | struct mem_size_stats *mss = walk->private; |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 574 | struct vm_area_struct *vma = walk->vma; |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 575 | struct page *page; |
| 576 | |
| 577 | /* FOLL_DUMP will return -EFAULT on huge zero page */ |
| 578 | page = follow_trans_huge_pmd(vma, addr, pmd, FOLL_DUMP); |
| 579 | if (IS_ERR_OR_NULL(page)) |
| 580 | return; |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 581 | if (PageAnon(page)) |
| 582 | mss->anonymous_thp += HPAGE_PMD_SIZE; |
| 583 | else if (PageSwapBacked(page)) |
| 584 | mss->shmem_thp += HPAGE_PMD_SIZE; |
Dan Williams | ca120cf | 2016-09-03 10:38:03 -0700 | [diff] [blame] | 585 | else if (is_zone_device_page(page)) |
| 586 | /* pass */; |
Kirill A. Shutemov | 65c4537 | 2016-07-26 15:26:10 -0700 | [diff] [blame] | 587 | else |
| 588 | VM_BUG_ON_PAGE(1, page); |
Kirill A. Shutemov | afd9883 | 2016-01-15 16:52:13 -0800 | [diff] [blame] | 589 | smaps_account(mss, page, true, pmd_young(*pmd), pmd_dirty(*pmd)); |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 590 | } |
| 591 | #else |
| 592 | static void smaps_pmd_entry(pmd_t *pmd, unsigned long addr, |
| 593 | struct mm_walk *walk) |
| 594 | { |
| 595 | } |
| 596 | #endif |
| 597 | |
Matt Mackall | b3ae5ac | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 598 | static int smaps_pte_range(pmd_t *pmd, unsigned long addr, unsigned long end, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 599 | struct mm_walk *walk) |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 600 | { |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 601 | struct vm_area_struct *vma = walk->vma; |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 602 | pte_t *pte; |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 603 | spinlock_t *ptl; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 604 | |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 605 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 606 | if (ptl) { |
Zi Yan | 84c3fc4 | 2017-09-08 16:11:01 -0700 | [diff] [blame] | 607 | if (pmd_present(*pmd)) |
| 608 | smaps_pmd_entry(pmd, addr, walk); |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 609 | spin_unlock(ptl); |
David Rientjes | 1403830 | 2017-09-08 16:13:41 -0700 | [diff] [blame] | 610 | goto out; |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 611 | } |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 612 | |
| 613 | if (pmd_trans_unstable(pmd)) |
David Rientjes | 1403830 | 2017-09-08 16:13:41 -0700 | [diff] [blame] | 614 | goto out; |
Dave Hansen | 22e057c | 2011-03-22 16:33:00 -0700 | [diff] [blame] | 615 | /* |
| 616 | * The mmap_sem held all the way back in m_start() is what |
| 617 | * keeps khugepaged out of here and from collapsing things |
| 618 | * in here. |
| 619 | */ |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 620 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
Dave Hansen | ae11c4d | 2011-03-22 16:32:58 -0700 | [diff] [blame] | 621 | for (; addr != end; pte++, addr += PAGE_SIZE) |
Kirill A. Shutemov | c164e03 | 2014-12-10 15:44:36 -0800 | [diff] [blame] | 622 | smaps_pte_entry(pte, addr, walk); |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 623 | pte_unmap_unlock(pte - 1, ptl); |
David Rientjes | 1403830 | 2017-09-08 16:13:41 -0700 | [diff] [blame] | 624 | out: |
Hugh Dickins | 705e87c | 2005-10-29 18:16:27 -0700 | [diff] [blame] | 625 | cond_resched(); |
Matt Mackall | b3ae5ac | 2008-02-04 22:29:01 -0800 | [diff] [blame] | 626 | return 0; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 627 | } |
| 628 | |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 629 | static void show_smap_vma_flags(struct seq_file *m, struct vm_area_struct *vma) |
| 630 | { |
| 631 | /* |
| 632 | * Don't forget to update Documentation/ on changes. |
| 633 | */ |
| 634 | static const char mnemonics[BITS_PER_LONG][2] = { |
| 635 | /* |
| 636 | * In case if we meet a flag we don't know about. |
| 637 | */ |
| 638 | [0 ... (BITS_PER_LONG-1)] = "??", |
| 639 | |
| 640 | [ilog2(VM_READ)] = "rd", |
| 641 | [ilog2(VM_WRITE)] = "wr", |
| 642 | [ilog2(VM_EXEC)] = "ex", |
| 643 | [ilog2(VM_SHARED)] = "sh", |
| 644 | [ilog2(VM_MAYREAD)] = "mr", |
| 645 | [ilog2(VM_MAYWRITE)] = "mw", |
| 646 | [ilog2(VM_MAYEXEC)] = "me", |
| 647 | [ilog2(VM_MAYSHARE)] = "ms", |
| 648 | [ilog2(VM_GROWSDOWN)] = "gd", |
| 649 | [ilog2(VM_PFNMAP)] = "pf", |
| 650 | [ilog2(VM_DENYWRITE)] = "dw", |
Qiaowei Ren | 4aae7e4 | 2014-11-14 07:18:25 -0800 | [diff] [blame] | 651 | #ifdef CONFIG_X86_INTEL_MPX |
| 652 | [ilog2(VM_MPX)] = "mp", |
| 653 | #endif |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 654 | [ilog2(VM_LOCKED)] = "lo", |
| 655 | [ilog2(VM_IO)] = "io", |
| 656 | [ilog2(VM_SEQ_READ)] = "sr", |
| 657 | [ilog2(VM_RAND_READ)] = "rr", |
| 658 | [ilog2(VM_DONTCOPY)] = "dc", |
| 659 | [ilog2(VM_DONTEXPAND)] = "de", |
| 660 | [ilog2(VM_ACCOUNT)] = "ac", |
| 661 | [ilog2(VM_NORESERVE)] = "nr", |
| 662 | [ilog2(VM_HUGETLB)] = "ht", |
Jan Kara | b6fb293 | 2017-11-01 16:36:41 +0100 | [diff] [blame] | 663 | [ilog2(VM_SYNC)] = "sf", |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 664 | [ilog2(VM_ARCH_1)] = "ar", |
Rik van Riel | d2cd9ed | 2017-09-06 16:25:15 -0700 | [diff] [blame] | 665 | [ilog2(VM_WIPEONFORK)] = "wf", |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 666 | [ilog2(VM_DONTDUMP)] = "dd", |
Naoya Horiguchi | ec8e41a | 2013-11-12 15:07:49 -0800 | [diff] [blame] | 667 | #ifdef CONFIG_MEM_SOFT_DIRTY |
| 668 | [ilog2(VM_SOFTDIRTY)] = "sd", |
| 669 | #endif |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 670 | [ilog2(VM_MIXEDMAP)] = "mm", |
| 671 | [ilog2(VM_HUGEPAGE)] = "hg", |
| 672 | [ilog2(VM_NOHUGEPAGE)] = "nh", |
| 673 | [ilog2(VM_MERGEABLE)] = "mg", |
Andrea Arcangeli | 16ba6f8 | 2015-09-04 15:46:17 -0700 | [diff] [blame] | 674 | [ilog2(VM_UFFD_MISSING)]= "um", |
| 675 | [ilog2(VM_UFFD_WP)] = "uw", |
Dave Hansen | c1192f8 | 2016-02-12 13:02:27 -0800 | [diff] [blame] | 676 | #ifdef CONFIG_X86_INTEL_MEMORY_PROTECTION_KEYS |
| 677 | /* These come out via ProtectionKey: */ |
| 678 | [ilog2(VM_PKEY_BIT0)] = "", |
| 679 | [ilog2(VM_PKEY_BIT1)] = "", |
| 680 | [ilog2(VM_PKEY_BIT2)] = "", |
| 681 | [ilog2(VM_PKEY_BIT3)] = "", |
| 682 | #endif |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 683 | }; |
| 684 | size_t i; |
| 685 | |
| 686 | seq_puts(m, "VmFlags: "); |
| 687 | for (i = 0; i < BITS_PER_LONG; i++) { |
Dave Hansen | c1192f8 | 2016-02-12 13:02:27 -0800 | [diff] [blame] | 688 | if (!mnemonics[i][0]) |
| 689 | continue; |
Cyrill Gorcunov | 834f82e | 2012-12-17 16:03:13 -0800 | [diff] [blame] | 690 | if (vma->vm_flags & (1UL << i)) { |
| 691 | seq_printf(m, "%c%c ", |
| 692 | mnemonics[i][0], mnemonics[i][1]); |
| 693 | } |
| 694 | } |
| 695 | seq_putc(m, '\n'); |
| 696 | } |
| 697 | |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 698 | #ifdef CONFIG_HUGETLB_PAGE |
| 699 | static int smaps_hugetlb_range(pte_t *pte, unsigned long hmask, |
| 700 | unsigned long addr, unsigned long end, |
| 701 | struct mm_walk *walk) |
| 702 | { |
| 703 | struct mem_size_stats *mss = walk->private; |
| 704 | struct vm_area_struct *vma = walk->vma; |
| 705 | struct page *page = NULL; |
| 706 | |
| 707 | if (pte_present(*pte)) { |
| 708 | page = vm_normal_page(vma, addr, *pte); |
| 709 | } else if (is_swap_pte(*pte)) { |
| 710 | swp_entry_t swpent = pte_to_swp_entry(*pte); |
| 711 | |
| 712 | if (is_migration_entry(swpent)) |
| 713 | page = migration_entry_to_page(swpent); |
Jérôme Glisse | 5042db4 | 2017-09-08 16:11:43 -0700 | [diff] [blame] | 714 | else if (is_device_private_entry(swpent)) |
| 715 | page = device_private_entry_to_page(swpent); |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 716 | } |
| 717 | if (page) { |
| 718 | int mapcount = page_mapcount(page); |
| 719 | |
| 720 | if (mapcount >= 2) |
| 721 | mss->shared_hugetlb += huge_page_size(hstate_vma(vma)); |
| 722 | else |
| 723 | mss->private_hugetlb += huge_page_size(hstate_vma(vma)); |
| 724 | } |
| 725 | return 0; |
| 726 | } |
| 727 | #endif /* HUGETLB_PAGE */ |
| 728 | |
Dave Hansen | c1192f8 | 2016-02-12 13:02:27 -0800 | [diff] [blame] | 729 | void __weak arch_show_smap(struct seq_file *m, struct vm_area_struct *vma) |
| 730 | { |
| 731 | } |
| 732 | |
Andrei Vagin | d1be35c | 2018-04-10 16:31:16 -0700 | [diff] [blame^] | 733 | #define SEQ_PUT_DEC(str, val) \ |
| 734 | seq_put_decimal_ull_width(m, str, (val) >> 10, 8) |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 735 | static int show_smap(struct seq_file *m, void *v, int is_pid) |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 736 | { |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 737 | struct proc_maps_private *priv = m->private; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 738 | struct vm_area_struct *vma = v; |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 739 | struct mem_size_stats mss_stack; |
| 740 | struct mem_size_stats *mss; |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 741 | struct mm_walk smaps_walk = { |
| 742 | .pmd_entry = smaps_pte_range, |
Naoya Horiguchi | 25ee01a | 2015-11-05 18:47:11 -0800 | [diff] [blame] | 743 | #ifdef CONFIG_HUGETLB_PAGE |
| 744 | .hugetlb_entry = smaps_hugetlb_range, |
| 745 | #endif |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 746 | .mm = vma->vm_mm, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 747 | }; |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 748 | int ret = 0; |
| 749 | bool rollup_mode; |
| 750 | bool last_vma; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 751 | |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 752 | if (priv->rollup) { |
| 753 | rollup_mode = true; |
| 754 | mss = priv->rollup; |
| 755 | if (mss->first) { |
| 756 | mss->first_vma_start = vma->vm_start; |
| 757 | mss->first = false; |
| 758 | } |
| 759 | last_vma = !m_next_vma(priv, vma); |
| 760 | } else { |
| 761 | rollup_mode = false; |
| 762 | memset(&mss_stack, 0, sizeof(mss_stack)); |
| 763 | mss = &mss_stack; |
| 764 | } |
| 765 | |
| 766 | smaps_walk.private = mss; |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 767 | |
| 768 | #ifdef CONFIG_SHMEM |
| 769 | if (vma->vm_file && shmem_mapping(vma->vm_file->f_mapping)) { |
Vlastimil Babka | 6a15a37 | 2016-01-14 15:19:20 -0800 | [diff] [blame] | 770 | /* |
| 771 | * For shared or readonly shmem mappings we know that all |
| 772 | * swapped out pages belong to the shmem object, and we can |
| 773 | * obtain the swap value much more efficiently. For private |
| 774 | * writable mappings, we might have COW pages that are |
| 775 | * not affected by the parent swapped out pages of the shmem |
| 776 | * object, so we have to distinguish them during the page walk. |
| 777 | * Unless we know that the shmem object (or the part mapped by |
| 778 | * our VMA) has no swapped out pages at all. |
| 779 | */ |
| 780 | unsigned long shmem_swapped = shmem_swap_usage(vma); |
| 781 | |
| 782 | if (!shmem_swapped || (vma->vm_flags & VM_SHARED) || |
| 783 | !(vma->vm_flags & VM_WRITE)) { |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 784 | mss->swap = shmem_swapped; |
Vlastimil Babka | 6a15a37 | 2016-01-14 15:19:20 -0800 | [diff] [blame] | 785 | } else { |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 786 | mss->check_shmem_swap = true; |
Vlastimil Babka | 6a15a37 | 2016-01-14 15:19:20 -0800 | [diff] [blame] | 787 | smaps_walk.pte_hole = smaps_pte_hole; |
| 788 | } |
Vlastimil Babka | c261e7d9 | 2016-01-14 15:19:17 -0800 | [diff] [blame] | 789 | } |
| 790 | #endif |
| 791 | |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 792 | /* mmap_sem is held in m_start */ |
Naoya Horiguchi | 14eb6fd | 2015-02-11 15:27:43 -0800 | [diff] [blame] | 793 | walk_page_vma(vma, &smaps_walk); |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 794 | if (vma->vm_flags & VM_LOCKED) |
| 795 | mss->pss_locked += mss->pss; |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 796 | |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 797 | if (!rollup_mode) { |
| 798 | show_map_vma(m, vma, is_pid); |
| 799 | } else if (last_vma) { |
| 800 | show_vma_header_prefix( |
| 801 | m, mss->first_vma_start, vma->vm_end, 0, 0, 0, 0); |
| 802 | seq_pad(m, ' '); |
| 803 | seq_puts(m, "[rollup]\n"); |
| 804 | } else { |
| 805 | ret = SEQ_SKIP; |
| 806 | } |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 807 | |
Andrei Vagin | d1be35c | 2018-04-10 16:31:16 -0700 | [diff] [blame^] | 808 | if (!rollup_mode) { |
| 809 | SEQ_PUT_DEC("Size: ", vma->vm_end - vma->vm_start); |
| 810 | SEQ_PUT_DEC(" kB\nKernelPageSize: ", vma_kernel_pagesize(vma)); |
| 811 | SEQ_PUT_DEC(" kB\nMMUPageSize: ", vma_mmu_pagesize(vma)); |
| 812 | seq_puts(m, " kB\n"); |
| 813 | } |
Matt Mackall | 4752c36 | 2008-02-04 22:29:02 -0800 | [diff] [blame] | 814 | |
Andrei Vagin | d1be35c | 2018-04-10 16:31:16 -0700 | [diff] [blame^] | 815 | if (!rollup_mode || last_vma) { |
| 816 | SEQ_PUT_DEC("Rss: ", mss->resident); |
| 817 | SEQ_PUT_DEC(" kB\nPss: ", mss->pss >> PSS_SHIFT); |
| 818 | SEQ_PUT_DEC(" kB\nShared_Clean: ", mss->shared_clean); |
| 819 | SEQ_PUT_DEC(" kB\nShared_Dirty: ", mss->shared_dirty); |
| 820 | SEQ_PUT_DEC(" kB\nPrivate_Clean: ", mss->private_clean); |
| 821 | SEQ_PUT_DEC(" kB\nPrivate_Dirty: ", mss->private_dirty); |
| 822 | SEQ_PUT_DEC(" kB\nReferenced: ", mss->referenced); |
| 823 | SEQ_PUT_DEC(" kB\nAnonymous: ", mss->anonymous); |
| 824 | SEQ_PUT_DEC(" kB\nLazyFree: ", mss->lazyfree); |
| 825 | SEQ_PUT_DEC(" kB\nAnonHugePages: ", mss->anonymous_thp); |
| 826 | SEQ_PUT_DEC(" kB\nShmemPmdMapped: ", mss->shmem_thp); |
| 827 | SEQ_PUT_DEC(" kB\nShared_Hugetlb: ", mss->shared_hugetlb); |
| 828 | seq_put_decimal_ull_width(m, " kB\nPrivate_Hugetlb: ", |
| 829 | mss->private_hugetlb >> 10, 7); |
| 830 | SEQ_PUT_DEC(" kB\nSwap: ", mss->swap); |
| 831 | SEQ_PUT_DEC(" kB\nSwapPss: ", |
| 832 | mss->swap_pss >> PSS_SHIFT); |
| 833 | SEQ_PUT_DEC(" kB\nLocked: ", mss->pss >> PSS_SHIFT); |
| 834 | seq_puts(m, " kB\n"); |
| 835 | } |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 836 | if (!rollup_mode) { |
| 837 | arch_show_smap(m, vma); |
| 838 | show_smap_vma_flags(m, vma); |
| 839 | } |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 840 | m_cache_vma(m, vma); |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 841 | return ret; |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 842 | } |
Andrei Vagin | d1be35c | 2018-04-10 16:31:16 -0700 | [diff] [blame^] | 843 | #undef SEQ_PUT_DEC |
Mauricio Lin | e070ad4 | 2005-09-03 15:55:10 -0700 | [diff] [blame] | 844 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 845 | static int show_pid_smap(struct seq_file *m, void *v) |
| 846 | { |
| 847 | return show_smap(m, v, 1); |
| 848 | } |
| 849 | |
| 850 | static int show_tid_smap(struct seq_file *m, void *v) |
| 851 | { |
| 852 | return show_smap(m, v, 0); |
| 853 | } |
| 854 | |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 855 | static const struct seq_operations proc_pid_smaps_op = { |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 856 | .start = m_start, |
| 857 | .next = m_next, |
| 858 | .stop = m_stop, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 859 | .show = show_pid_smap |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 860 | }; |
| 861 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 862 | static const struct seq_operations proc_tid_smaps_op = { |
| 863 | .start = m_start, |
| 864 | .next = m_next, |
| 865 | .stop = m_stop, |
| 866 | .show = show_tid_smap |
| 867 | }; |
| 868 | |
| 869 | static int pid_smaps_open(struct inode *inode, struct file *file) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 870 | { |
| 871 | return do_maps_open(inode, file, &proc_pid_smaps_op); |
| 872 | } |
| 873 | |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 874 | static int pid_smaps_rollup_open(struct inode *inode, struct file *file) |
| 875 | { |
| 876 | struct seq_file *seq; |
| 877 | struct proc_maps_private *priv; |
| 878 | int ret = do_maps_open(inode, file, &proc_pid_smaps_op); |
| 879 | |
| 880 | if (ret < 0) |
| 881 | return ret; |
| 882 | seq = file->private_data; |
| 883 | priv = seq->private; |
| 884 | priv->rollup = kzalloc(sizeof(*priv->rollup), GFP_KERNEL); |
| 885 | if (!priv->rollup) { |
| 886 | proc_map_release(inode, file); |
| 887 | return -ENOMEM; |
| 888 | } |
| 889 | priv->rollup->first = true; |
| 890 | return 0; |
| 891 | } |
| 892 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 893 | static int tid_smaps_open(struct inode *inode, struct file *file) |
| 894 | { |
| 895 | return do_maps_open(inode, file, &proc_tid_smaps_op); |
| 896 | } |
| 897 | |
| 898 | const struct file_operations proc_pid_smaps_operations = { |
| 899 | .open = pid_smaps_open, |
| 900 | .read = seq_read, |
| 901 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 902 | .release = proc_map_release, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 903 | }; |
| 904 | |
Daniel Colascione | 493b0e9 | 2017-09-06 16:25:08 -0700 | [diff] [blame] | 905 | const struct file_operations proc_pid_smaps_rollup_operations = { |
| 906 | .open = pid_smaps_rollup_open, |
| 907 | .read = seq_read, |
| 908 | .llseek = seq_lseek, |
| 909 | .release = proc_map_release, |
| 910 | }; |
| 911 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 912 | const struct file_operations proc_tid_smaps_operations = { |
| 913 | .open = tid_smaps_open, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 914 | .read = seq_read, |
| 915 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 916 | .release = proc_map_release, |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 917 | }; |
| 918 | |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 919 | enum clear_refs_types { |
| 920 | CLEAR_REFS_ALL = 1, |
| 921 | CLEAR_REFS_ANON, |
| 922 | CLEAR_REFS_MAPPED, |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 923 | CLEAR_REFS_SOFT_DIRTY, |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 924 | CLEAR_REFS_MM_HIWATER_RSS, |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 925 | CLEAR_REFS_LAST, |
| 926 | }; |
| 927 | |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 928 | struct clear_refs_private { |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 929 | enum clear_refs_types type; |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 930 | }; |
| 931 | |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 932 | #ifdef CONFIG_MEM_SOFT_DIRTY |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 933 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
| 934 | unsigned long addr, pte_t *pte) |
| 935 | { |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 936 | /* |
| 937 | * The soft-dirty tracker uses #PF-s to catch writes |
| 938 | * to pages, so write-protect the pte as well. See the |
| 939 | * Documentation/vm/soft-dirty.txt for full description |
| 940 | * of how soft-dirty works. |
| 941 | */ |
| 942 | pte_t ptent = *pte; |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 943 | |
| 944 | if (pte_present(ptent)) { |
Laurent Dufour | 326c259 | 2015-11-05 18:49:21 -0800 | [diff] [blame] | 945 | ptent = ptep_modify_prot_start(vma->vm_mm, addr, pte); |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 946 | ptent = pte_wrprotect(ptent); |
Martin Schwidefsky | a7b7617 | 2015-04-22 14:20:47 +0200 | [diff] [blame] | 947 | ptent = pte_clear_soft_dirty(ptent); |
Laurent Dufour | 326c259 | 2015-11-05 18:49:21 -0800 | [diff] [blame] | 948 | ptep_modify_prot_commit(vma->vm_mm, addr, pte, ptent); |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 949 | } else if (is_swap_pte(ptent)) { |
| 950 | ptent = pte_swp_clear_soft_dirty(ptent); |
Laurent Dufour | 326c259 | 2015-11-05 18:49:21 -0800 | [diff] [blame] | 951 | set_pte_at(vma->vm_mm, addr, pte, ptent); |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 952 | } |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 953 | } |
Laurent Dufour | 5d3875a | 2015-11-05 18:49:24 -0800 | [diff] [blame] | 954 | #else |
| 955 | static inline void clear_soft_dirty(struct vm_area_struct *vma, |
| 956 | unsigned long addr, pte_t *pte) |
| 957 | { |
| 958 | } |
| 959 | #endif |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 960 | |
Laurent Dufour | 5d3875a | 2015-11-05 18:49:24 -0800 | [diff] [blame] | 961 | #if defined(CONFIG_MEM_SOFT_DIRTY) && defined(CONFIG_TRANSPARENT_HUGEPAGE) |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 962 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
| 963 | unsigned long addr, pmd_t *pmdp) |
| 964 | { |
Kirill A. Shutemov | a3cf988 | 2018-01-31 16:18:20 -0800 | [diff] [blame] | 965 | pmd_t old, pmd = *pmdp; |
Kirill A. Shutemov | 5b7abea | 2017-04-13 14:56:28 -0700 | [diff] [blame] | 966 | |
Naoya Horiguchi | ab6e3d0 | 2017-09-08 16:11:04 -0700 | [diff] [blame] | 967 | if (pmd_present(pmd)) { |
| 968 | /* See comment in change_huge_pmd() */ |
Kirill A. Shutemov | a3cf988 | 2018-01-31 16:18:20 -0800 | [diff] [blame] | 969 | old = pmdp_invalidate(vma, addr, pmdp); |
| 970 | if (pmd_dirty(old)) |
Naoya Horiguchi | ab6e3d0 | 2017-09-08 16:11:04 -0700 | [diff] [blame] | 971 | pmd = pmd_mkdirty(pmd); |
Kirill A. Shutemov | a3cf988 | 2018-01-31 16:18:20 -0800 | [diff] [blame] | 972 | if (pmd_young(old)) |
Naoya Horiguchi | ab6e3d0 | 2017-09-08 16:11:04 -0700 | [diff] [blame] | 973 | pmd = pmd_mkyoung(pmd); |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 974 | |
Naoya Horiguchi | ab6e3d0 | 2017-09-08 16:11:04 -0700 | [diff] [blame] | 975 | pmd = pmd_wrprotect(pmd); |
| 976 | pmd = pmd_clear_soft_dirty(pmd); |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 977 | |
Naoya Horiguchi | ab6e3d0 | 2017-09-08 16:11:04 -0700 | [diff] [blame] | 978 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); |
| 979 | } else if (is_migration_entry(pmd_to_swp_entry(pmd))) { |
| 980 | pmd = pmd_swp_clear_soft_dirty(pmd); |
| 981 | set_pmd_at(vma->vm_mm, addr, pmdp, pmd); |
| 982 | } |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 983 | } |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 984 | #else |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 985 | static inline void clear_soft_dirty_pmd(struct vm_area_struct *vma, |
| 986 | unsigned long addr, pmd_t *pmdp) |
| 987 | { |
| 988 | } |
| 989 | #endif |
| 990 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 991 | static int clear_refs_pte_range(pmd_t *pmd, unsigned long addr, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 992 | unsigned long end, struct mm_walk *walk) |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 993 | { |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 994 | struct clear_refs_private *cp = walk->private; |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 995 | struct vm_area_struct *vma = walk->vma; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 996 | pte_t *pte, ptent; |
| 997 | spinlock_t *ptl; |
| 998 | struct page *page; |
| 999 | |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 1000 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 1001 | if (ptl) { |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 1002 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
| 1003 | clear_soft_dirty_pmd(vma, addr, pmd); |
| 1004 | goto out; |
| 1005 | } |
| 1006 | |
Zi Yan | 84c3fc4 | 2017-09-08 16:11:01 -0700 | [diff] [blame] | 1007 | if (!pmd_present(*pmd)) |
| 1008 | goto out; |
| 1009 | |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 1010 | page = pmd_page(*pmd); |
| 1011 | |
| 1012 | /* Clear accessed and referenced bits. */ |
| 1013 | pmdp_test_and_clear_young(vma, addr, pmd); |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 1014 | test_and_clear_page_young(page); |
Kirill A. Shutemov | 7d5b3bf | 2015-02-11 15:28:08 -0800 | [diff] [blame] | 1015 | ClearPageReferenced(page); |
| 1016 | out: |
| 1017 | spin_unlock(ptl); |
| 1018 | return 0; |
| 1019 | } |
| 1020 | |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 1021 | if (pmd_trans_unstable(pmd)) |
| 1022 | return 0; |
Dave Hansen | 0331932 | 2011-03-22 16:32:56 -0700 | [diff] [blame] | 1023 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1024 | pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); |
| 1025 | for (; addr != end; pte++, addr += PAGE_SIZE) { |
| 1026 | ptent = *pte; |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1027 | |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1028 | if (cp->type == CLEAR_REFS_SOFT_DIRTY) { |
| 1029 | clear_soft_dirty(vma, addr, pte); |
| 1030 | continue; |
| 1031 | } |
| 1032 | |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 1033 | if (!pte_present(ptent)) |
| 1034 | continue; |
| 1035 | |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1036 | page = vm_normal_page(vma, addr, ptent); |
| 1037 | if (!page) |
| 1038 | continue; |
| 1039 | |
| 1040 | /* Clear accessed and referenced bits. */ |
| 1041 | ptep_test_and_clear_young(vma, addr, pte); |
Vladimir Davydov | 33c3fc7 | 2015-09-09 15:35:45 -0700 | [diff] [blame] | 1042 | test_and_clear_page_young(page); |
Matt Mackall | a619879 | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1043 | ClearPageReferenced(page); |
| 1044 | } |
| 1045 | pte_unmap_unlock(pte - 1, ptl); |
| 1046 | cond_resched(); |
| 1047 | return 0; |
| 1048 | } |
| 1049 | |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 1050 | static int clear_refs_test_walk(unsigned long start, unsigned long end, |
| 1051 | struct mm_walk *walk) |
| 1052 | { |
| 1053 | struct clear_refs_private *cp = walk->private; |
| 1054 | struct vm_area_struct *vma = walk->vma; |
| 1055 | |
Naoya Horiguchi | 48684a6 | 2015-02-11 15:28:06 -0800 | [diff] [blame] | 1056 | if (vma->vm_flags & VM_PFNMAP) |
| 1057 | return 1; |
| 1058 | |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 1059 | /* |
| 1060 | * Writing 1 to /proc/pid/clear_refs affects all pages. |
| 1061 | * Writing 2 to /proc/pid/clear_refs only affects anonymous pages. |
| 1062 | * Writing 3 to /proc/pid/clear_refs only affects file mapped pages. |
| 1063 | * Writing 4 to /proc/pid/clear_refs affects all pages. |
| 1064 | */ |
| 1065 | if (cp->type == CLEAR_REFS_ANON && vma->vm_file) |
| 1066 | return 1; |
| 1067 | if (cp->type == CLEAR_REFS_MAPPED && !vma->vm_file) |
| 1068 | return 1; |
| 1069 | return 0; |
| 1070 | } |
| 1071 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1072 | static ssize_t clear_refs_write(struct file *file, const char __user *buf, |
| 1073 | size_t count, loff_t *ppos) |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1074 | { |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1075 | struct task_struct *task; |
Vincent Li | fb92a4b | 2009-09-22 16:45:36 -0700 | [diff] [blame] | 1076 | char buffer[PROC_NUMBUF]; |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1077 | struct mm_struct *mm; |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1078 | struct vm_area_struct *vma; |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 1079 | enum clear_refs_types type; |
Minchan Kim | b3a81d0 | 2017-08-10 15:24:15 -0700 | [diff] [blame] | 1080 | struct mmu_gather tlb; |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 1081 | int itype; |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1082 | int rv; |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1083 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1084 | memset(buffer, 0, sizeof(buffer)); |
| 1085 | if (count > sizeof(buffer) - 1) |
| 1086 | count = sizeof(buffer) - 1; |
| 1087 | if (copy_from_user(buffer, buf, count)) |
| 1088 | return -EFAULT; |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 1089 | rv = kstrtoint(strstrip(buffer), 10, &itype); |
Alexey Dobriyan | 0a8cb8e | 2011-05-26 16:25:50 -0700 | [diff] [blame] | 1090 | if (rv < 0) |
| 1091 | return rv; |
Pavel Emelyanov | 040fa02 | 2013-07-03 15:01:16 -0700 | [diff] [blame] | 1092 | type = (enum clear_refs_types)itype; |
| 1093 | if (type < CLEAR_REFS_ALL || type >= CLEAR_REFS_LAST) |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1094 | return -EINVAL; |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1095 | |
Al Viro | 496ad9a | 2013-01-23 17:07:38 -0500 | [diff] [blame] | 1096 | task = get_proc_task(file_inode(file)); |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1097 | if (!task) |
| 1098 | return -ESRCH; |
| 1099 | mm = get_task_mm(task); |
| 1100 | if (mm) { |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 1101 | struct clear_refs_private cp = { |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1102 | .type = type, |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 1103 | }; |
Andrew Morton | 20cbc97 | 2008-07-05 12:29:05 -0700 | [diff] [blame] | 1104 | struct mm_walk clear_refs_walk = { |
| 1105 | .pmd_entry = clear_refs_pte_range, |
Naoya Horiguchi | 5c64f52 | 2015-02-11 15:27:46 -0800 | [diff] [blame] | 1106 | .test_walk = clear_refs_test_walk, |
Andrew Morton | 20cbc97 | 2008-07-05 12:29:05 -0700 | [diff] [blame] | 1107 | .mm = mm, |
Pavel Emelyanov | af9de7e | 2013-07-03 15:01:18 -0700 | [diff] [blame] | 1108 | .private = &cp, |
Andrew Morton | 20cbc97 | 2008-07-05 12:29:05 -0700 | [diff] [blame] | 1109 | }; |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1110 | |
| 1111 | if (type == CLEAR_REFS_MM_HIWATER_RSS) { |
Michal Hocko | 4e80153 | 2016-05-23 16:25:45 -0700 | [diff] [blame] | 1112 | if (down_write_killable(&mm->mmap_sem)) { |
| 1113 | count = -EINTR; |
| 1114 | goto out_mm; |
| 1115 | } |
| 1116 | |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1117 | /* |
| 1118 | * Writing 5 to /proc/pid/clear_refs resets the peak |
| 1119 | * resident set size to this mm's current rss value. |
| 1120 | */ |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1121 | reset_mm_hiwater_rss(mm); |
| 1122 | up_write(&mm->mmap_sem); |
| 1123 | goto out_mm; |
| 1124 | } |
| 1125 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1126 | down_read(&mm->mmap_sem); |
Minchan Kim | b3a81d0 | 2017-08-10 15:24:15 -0700 | [diff] [blame] | 1127 | tlb_gather_mmu(&tlb, mm, 0, -1); |
Peter Feiner | 64e45507 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 1128 | if (type == CLEAR_REFS_SOFT_DIRTY) { |
| 1129 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 1130 | if (!(vma->vm_flags & VM_SOFTDIRTY)) |
| 1131 | continue; |
| 1132 | up_read(&mm->mmap_sem); |
Michal Hocko | 4e80153 | 2016-05-23 16:25:45 -0700 | [diff] [blame] | 1133 | if (down_write_killable(&mm->mmap_sem)) { |
| 1134 | count = -EINTR; |
| 1135 | goto out_mm; |
| 1136 | } |
Peter Feiner | 64e45507 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 1137 | for (vma = mm->mmap; vma; vma = vma->vm_next) { |
| 1138 | vma->vm_flags &= ~VM_SOFTDIRTY; |
| 1139 | vma_set_page_prot(vma); |
| 1140 | } |
| 1141 | downgrade_write(&mm->mmap_sem); |
| 1142 | break; |
| 1143 | } |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1144 | mmu_notifier_invalidate_range_start(mm, 0, -1); |
Peter Feiner | 64e45507 | 2014-10-13 15:55:46 -0700 | [diff] [blame] | 1145 | } |
James Morse | 0f30206 | 2016-10-07 17:00:06 -0700 | [diff] [blame] | 1146 | walk_page_range(0, mm->highest_vm_end, &clear_refs_walk); |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1147 | if (type == CLEAR_REFS_SOFT_DIRTY) |
| 1148 | mmu_notifier_invalidate_range_end(mm, 0, -1); |
Minchan Kim | b3a81d0 | 2017-08-10 15:24:15 -0700 | [diff] [blame] | 1149 | tlb_finish_mmu(&tlb, 0, -1); |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1150 | up_read(&mm->mmap_sem); |
Petr Cermak | 695f055 | 2015-02-12 15:01:00 -0800 | [diff] [blame] | 1151 | out_mm: |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1152 | mmput(mm); |
| 1153 | } |
| 1154 | put_task_struct(task); |
Vincent Li | fb92a4b | 2009-09-22 16:45:36 -0700 | [diff] [blame] | 1155 | |
| 1156 | return count; |
David Rientjes | b813e93 | 2007-05-06 14:49:24 -0700 | [diff] [blame] | 1157 | } |
| 1158 | |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1159 | const struct file_operations proc_clear_refs_operations = { |
| 1160 | .write = clear_refs_write, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1161 | .llseek = noop_llseek, |
Matt Mackall | f248dcb | 2008-02-04 22:29:03 -0800 | [diff] [blame] | 1162 | }; |
| 1163 | |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1164 | typedef struct { |
| 1165 | u64 pme; |
| 1166 | } pagemap_entry_t; |
| 1167 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1168 | struct pagemapread { |
yonghua zheng | 8c82962 | 2013-08-13 16:01:03 -0700 | [diff] [blame] | 1169 | int pos, len; /* units: PM_ENTRY_BYTES, not bytes */ |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1170 | pagemap_entry_t *buffer; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1171 | bool show_pfn; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1172 | }; |
| 1173 | |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1174 | #define PAGEMAP_WALK_SIZE (PMD_SIZE) |
| 1175 | #define PAGEMAP_WALK_MASK (PMD_MASK) |
| 1176 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1177 | #define PM_ENTRY_BYTES sizeof(pagemap_entry_t) |
| 1178 | #define PM_PFRAME_BITS 55 |
| 1179 | #define PM_PFRAME_MASK GENMASK_ULL(PM_PFRAME_BITS - 1, 0) |
| 1180 | #define PM_SOFT_DIRTY BIT_ULL(55) |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1181 | #define PM_MMAP_EXCLUSIVE BIT_ULL(56) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1182 | #define PM_FILE BIT_ULL(61) |
| 1183 | #define PM_SWAP BIT_ULL(62) |
| 1184 | #define PM_PRESENT BIT_ULL(63) |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1185 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1186 | #define PM_END_OF_BUFFER 1 |
| 1187 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1188 | static inline pagemap_entry_t make_pme(u64 frame, u64 flags) |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1189 | { |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1190 | return (pagemap_entry_t) { .pme = (frame & PM_PFRAME_MASK) | flags }; |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1191 | } |
| 1192 | |
| 1193 | static int add_to_pagemap(unsigned long addr, pagemap_entry_t *pme, |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1194 | struct pagemapread *pm) |
| 1195 | { |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1196 | pm->buffer[pm->pos++] = *pme; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1197 | if (pm->pos >= pm->len) |
Thomas Tuttle | aae8679 | 2008-06-05 22:46:31 -0700 | [diff] [blame] | 1198 | return PM_END_OF_BUFFER; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1199 | return 0; |
| 1200 | } |
| 1201 | |
| 1202 | static int pagemap_pte_hole(unsigned long start, unsigned long end, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1203 | struct mm_walk *walk) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1204 | { |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1205 | struct pagemapread *pm = walk->private; |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1206 | unsigned long addr = start; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1207 | int err = 0; |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1208 | |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1209 | while (addr < end) { |
| 1210 | struct vm_area_struct *vma = find_vma(walk->mm, addr); |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1211 | pagemap_entry_t pme = make_pme(0, 0); |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1212 | /* End of address space hole, which we mark as non-present. */ |
| 1213 | unsigned long hole_end; |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1214 | |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1215 | if (vma) |
| 1216 | hole_end = min(end, vma->vm_start); |
| 1217 | else |
| 1218 | hole_end = end; |
| 1219 | |
| 1220 | for (; addr < hole_end; addr += PAGE_SIZE) { |
| 1221 | err = add_to_pagemap(addr, &pme, pm); |
| 1222 | if (err) |
| 1223 | goto out; |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1224 | } |
| 1225 | |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1226 | if (!vma) |
| 1227 | break; |
| 1228 | |
| 1229 | /* Addresses in the VMA. */ |
| 1230 | if (vma->vm_flags & VM_SOFTDIRTY) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1231 | pme = make_pme(0, PM_SOFT_DIRTY); |
Peter Feiner | 87e6d49 | 2014-09-25 16:05:18 -0700 | [diff] [blame] | 1232 | for (; addr < min(end, vma->vm_end); addr += PAGE_SIZE) { |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1233 | err = add_to_pagemap(addr, &pme, pm); |
| 1234 | if (err) |
| 1235 | goto out; |
| 1236 | } |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1237 | } |
Peter Feiner | 68b5a65 | 2014-08-06 16:08:09 -0700 | [diff] [blame] | 1238 | out: |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1239 | return err; |
| 1240 | } |
| 1241 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1242 | static pagemap_entry_t pte_to_pagemap_entry(struct pagemapread *pm, |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1243 | struct vm_area_struct *vma, unsigned long addr, pte_t pte) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1244 | { |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1245 | u64 frame = 0, flags = 0; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1246 | struct page *page = NULL; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1247 | |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1248 | if (pte_present(pte)) { |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1249 | if (pm->show_pfn) |
| 1250 | frame = pte_pfn(pte); |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1251 | flags |= PM_PRESENT; |
Jérôme Glisse | df6ad69 | 2017-09-08 16:12:24 -0700 | [diff] [blame] | 1252 | page = _vm_normal_page(vma, addr, pte, true); |
Cyrill Gorcunov | e9cdd6e | 2013-10-16 13:46:53 -0700 | [diff] [blame] | 1253 | if (pte_soft_dirty(pte)) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1254 | flags |= PM_SOFT_DIRTY; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1255 | } else if (is_swap_pte(pte)) { |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 1256 | swp_entry_t entry; |
| 1257 | if (pte_swp_soft_dirty(pte)) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1258 | flags |= PM_SOFT_DIRTY; |
Cyrill Gorcunov | 179ef71 | 2013-08-13 16:00:49 -0700 | [diff] [blame] | 1259 | entry = pte_to_swp_entry(pte); |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1260 | frame = swp_type(entry) | |
| 1261 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1262 | flags |= PM_SWAP; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1263 | if (is_migration_entry(entry)) |
| 1264 | page = migration_entry_to_page(entry); |
Jérôme Glisse | 5042db4 | 2017-09-08 16:11:43 -0700 | [diff] [blame] | 1265 | |
| 1266 | if (is_device_private_entry(entry)) |
| 1267 | page = device_private_entry_to_page(entry); |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1268 | } |
| 1269 | |
| 1270 | if (page && !PageAnon(page)) |
| 1271 | flags |= PM_FILE; |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1272 | if (page && page_mapcount(page) == 1) |
| 1273 | flags |= PM_MMAP_EXCLUSIVE; |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1274 | if (vma->vm_flags & VM_SOFTDIRTY) |
| 1275 | flags |= PM_SOFT_DIRTY; |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1276 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1277 | return make_pme(frame, flags); |
Dave Hansen | bcf8039 | 2008-06-12 15:21:48 -0700 | [diff] [blame] | 1278 | } |
| 1279 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1280 | static int pagemap_pmd_range(pmd_t *pmdp, unsigned long addr, unsigned long end, |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1281 | struct mm_walk *walk) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1282 | { |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1283 | struct vm_area_struct *vma = walk->vma; |
Dave Hansen | 2165009 | 2008-06-12 15:21:47 -0700 | [diff] [blame] | 1284 | struct pagemapread *pm = walk->private; |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 1285 | spinlock_t *ptl; |
Konstantin Khlebnikov | 05fbf35 | 2015-02-11 15:27:31 -0800 | [diff] [blame] | 1286 | pte_t *pte, *orig_pte; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1287 | int err = 0; |
| 1288 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1289 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 1290 | ptl = pmd_trans_huge_lock(pmdp, vma); |
| 1291 | if (ptl) { |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1292 | u64 flags = 0, frame = 0; |
| 1293 | pmd_t pmd = *pmdp; |
Zi Yan | 84c3fc4 | 2017-09-08 16:11:01 -0700 | [diff] [blame] | 1294 | struct page *page = NULL; |
Pavel Emelyanov | 0f8975e | 2013-07-03 15:01:20 -0700 | [diff] [blame] | 1295 | |
Huang Ying | b83d7e4 | 2017-11-02 15:59:34 -0700 | [diff] [blame] | 1296 | if (vma->vm_flags & VM_SOFTDIRTY) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1297 | flags |= PM_SOFT_DIRTY; |
Cyrill Gorcunov | d9104d1 | 2013-09-11 14:22:24 -0700 | [diff] [blame] | 1298 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1299 | if (pmd_present(pmd)) { |
Zi Yan | 84c3fc4 | 2017-09-08 16:11:01 -0700 | [diff] [blame] | 1300 | page = pmd_page(pmd); |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1301 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1302 | flags |= PM_PRESENT; |
Huang Ying | b83d7e4 | 2017-11-02 15:59:34 -0700 | [diff] [blame] | 1303 | if (pmd_soft_dirty(pmd)) |
| 1304 | flags |= PM_SOFT_DIRTY; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1305 | if (pm->show_pfn) |
| 1306 | frame = pmd_pfn(pmd) + |
| 1307 | ((addr & ~PMD_MASK) >> PAGE_SHIFT); |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1308 | } |
Zi Yan | 84c3fc4 | 2017-09-08 16:11:01 -0700 | [diff] [blame] | 1309 | #ifdef CONFIG_ARCH_ENABLE_THP_MIGRATION |
| 1310 | else if (is_swap_pmd(pmd)) { |
| 1311 | swp_entry_t entry = pmd_to_swp_entry(pmd); |
| 1312 | |
| 1313 | frame = swp_type(entry) | |
| 1314 | (swp_offset(entry) << MAX_SWAPFILES_SHIFT); |
| 1315 | flags |= PM_SWAP; |
Huang Ying | b83d7e4 | 2017-11-02 15:59:34 -0700 | [diff] [blame] | 1316 | if (pmd_swp_soft_dirty(pmd)) |
| 1317 | flags |= PM_SOFT_DIRTY; |
Zi Yan | 84c3fc4 | 2017-09-08 16:11:01 -0700 | [diff] [blame] | 1318 | VM_BUG_ON(!is_pmd_migration_entry(pmd)); |
| 1319 | page = migration_entry_to_page(entry); |
| 1320 | } |
| 1321 | #endif |
| 1322 | |
| 1323 | if (page && page_mapcount(page) == 1) |
| 1324 | flags |= PM_MMAP_EXCLUSIVE; |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1325 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1326 | for (; addr != end; addr += PAGE_SIZE) { |
| 1327 | pagemap_entry_t pme = make_pme(frame, flags); |
| 1328 | |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1329 | err = add_to_pagemap(addr, &pme, pm); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1330 | if (err) |
| 1331 | break; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1332 | if (pm->show_pfn && (flags & PM_PRESENT)) |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1333 | frame++; |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1334 | } |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 1335 | spin_unlock(ptl); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1336 | return err; |
Naoya Horiguchi | 5aaabe8 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1337 | } |
| 1338 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1339 | if (pmd_trans_unstable(pmdp)) |
Andrea Arcangeli | 45f83ce | 2012-03-28 14:42:40 -0700 | [diff] [blame] | 1340 | return 0; |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1341 | #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ |
Dave Hansen | bcf8039 | 2008-06-12 15:21:48 -0700 | [diff] [blame] | 1342 | |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1343 | /* |
| 1344 | * We can assume that @vma always points to a valid one and @end never |
| 1345 | * goes beyond vma->vm_end. |
| 1346 | */ |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1347 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmdp, addr, &ptl); |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1348 | for (; addr < end; pte++, addr += PAGE_SIZE) { |
| 1349 | pagemap_entry_t pme; |
Peter Feiner | 81d0fa6 | 2014-10-09 15:28:32 -0700 | [diff] [blame] | 1350 | |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1351 | pme = pte_to_pagemap_entry(pm, vma, addr, *pte); |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1352 | err = add_to_pagemap(addr, &pme, pm); |
Konstantin Khlebnikov | 05fbf35 | 2015-02-11 15:27:31 -0800 | [diff] [blame] | 1353 | if (err) |
Peter Feiner | 81d0fa6 | 2014-10-09 15:28:32 -0700 | [diff] [blame] | 1354 | break; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1355 | } |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1356 | pte_unmap_unlock(orig_pte, ptl); |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1357 | |
| 1358 | cond_resched(); |
| 1359 | |
| 1360 | return err; |
| 1361 | } |
| 1362 | |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1363 | #ifdef CONFIG_HUGETLB_PAGE |
Naoya Horiguchi | 116354d | 2010-04-06 14:35:04 -0700 | [diff] [blame] | 1364 | /* This function walks within one hugetlb entry in the single call */ |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1365 | static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask, |
Naoya Horiguchi | 116354d | 2010-04-06 14:35:04 -0700 | [diff] [blame] | 1366 | unsigned long addr, unsigned long end, |
| 1367 | struct mm_walk *walk) |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1368 | { |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1369 | struct pagemapread *pm = walk->private; |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1370 | struct vm_area_struct *vma = walk->vma; |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1371 | u64 flags = 0, frame = 0; |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1372 | int err = 0; |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1373 | pte_t pte; |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1374 | |
Naoya Horiguchi | f995ece | 2015-02-11 15:27:48 -0800 | [diff] [blame] | 1375 | if (vma->vm_flags & VM_SOFTDIRTY) |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1376 | flags |= PM_SOFT_DIRTY; |
Cyrill Gorcunov | d9104d1 | 2013-09-11 14:22:24 -0700 | [diff] [blame] | 1377 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1378 | pte = huge_ptep_get(ptep); |
| 1379 | if (pte_present(pte)) { |
| 1380 | struct page *page = pte_page(pte); |
| 1381 | |
| 1382 | if (!PageAnon(page)) |
| 1383 | flags |= PM_FILE; |
| 1384 | |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1385 | if (page_mapcount(page) == 1) |
| 1386 | flags |= PM_MMAP_EXCLUSIVE; |
| 1387 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1388 | flags |= PM_PRESENT; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1389 | if (pm->show_pfn) |
| 1390 | frame = pte_pfn(pte) + |
| 1391 | ((addr & ~hmask) >> PAGE_SHIFT); |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1392 | } |
| 1393 | |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1394 | for (; addr != end; addr += PAGE_SIZE) { |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1395 | pagemap_entry_t pme = make_pme(frame, flags); |
| 1396 | |
Naoya Horiguchi | 092b50b | 2012-03-21 16:33:59 -0700 | [diff] [blame] | 1397 | err = add_to_pagemap(addr, &pme, pm); |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1398 | if (err) |
| 1399 | return err; |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1400 | if (pm->show_pfn && (flags & PM_PRESENT)) |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1401 | frame++; |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1402 | } |
| 1403 | |
| 1404 | cond_resched(); |
| 1405 | |
| 1406 | return err; |
| 1407 | } |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1408 | #endif /* HUGETLB_PAGE */ |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1409 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1410 | /* |
| 1411 | * /proc/pid/pagemap - an array mapping virtual pages to pfns |
| 1412 | * |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1413 | * For each page in the address space, this file contains one 64-bit entry |
| 1414 | * consisting of the following: |
| 1415 | * |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1416 | * Bits 0-54 page frame number (PFN) if present |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1417 | * Bits 0-4 swap type if swapped |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1418 | * Bits 5-54 swap offset if swapped |
Konstantin Khlebnikov | deb9454 | 2015-09-08 15:00:02 -0700 | [diff] [blame] | 1419 | * Bit 55 pte is soft-dirty (see Documentation/vm/soft-dirty.txt) |
Konstantin Khlebnikov | 77bb499 | 2015-09-08 15:00:10 -0700 | [diff] [blame] | 1420 | * Bit 56 page exclusively mapped |
| 1421 | * Bits 57-60 zero |
Konstantin Khlebnikov | 052fb0d | 2012-05-31 16:26:19 -0700 | [diff] [blame] | 1422 | * Bit 61 page is file-page or shared-anon |
Hans Rosenfeld | f16278c | 2008-03-21 18:46:59 -0500 | [diff] [blame] | 1423 | * Bit 62 page swapped |
| 1424 | * Bit 63 page present |
| 1425 | * |
| 1426 | * If the page is not present but in swap, then the PFN contains an |
| 1427 | * encoding of the swap file number and the page's offset into the |
| 1428 | * swap. Unmapped pages return a null PFN. This allows determining |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1429 | * precisely which pages are mapped (or in swap) and comparing mapped |
| 1430 | * pages between processes. |
| 1431 | * |
| 1432 | * Efficient users of this interface will use /proc/pid/maps to |
| 1433 | * determine which areas of memory are actually mapped and llseek to |
| 1434 | * skip over unmapped regions. |
| 1435 | */ |
| 1436 | static ssize_t pagemap_read(struct file *file, char __user *buf, |
| 1437 | size_t count, loff_t *ppos) |
| 1438 | { |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1439 | struct mm_struct *mm = file->private_data; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1440 | struct pagemapread pm; |
Alexey Dobriyan | ee1e6ab | 2008-07-21 14:21:36 -0700 | [diff] [blame] | 1441 | struct mm_walk pagemap_walk = {}; |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1442 | unsigned long src; |
| 1443 | unsigned long svpfn; |
| 1444 | unsigned long start_vaddr; |
| 1445 | unsigned long end_vaddr; |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1446 | int ret = 0, copied = 0; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1447 | |
Vegard Nossum | 388f793 | 2017-02-27 14:30:13 -0800 | [diff] [blame] | 1448 | if (!mm || !mmget_not_zero(mm)) |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1449 | goto out; |
| 1450 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1451 | ret = -EINVAL; |
| 1452 | /* file position must be aligned */ |
Thomas Tuttle | aae8679 | 2008-06-05 22:46:31 -0700 | [diff] [blame] | 1453 | if ((*ppos % PM_ENTRY_BYTES) || (count % PM_ENTRY_BYTES)) |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1454 | goto out_mm; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1455 | |
| 1456 | ret = 0; |
Vitaly Mayatskikh | 0816178 | 2009-04-30 15:08:18 -0700 | [diff] [blame] | 1457 | if (!count) |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1458 | goto out_mm; |
Vitaly Mayatskikh | 0816178 | 2009-04-30 15:08:18 -0700 | [diff] [blame] | 1459 | |
Konstantin Khlebnikov | 1c90308 | 2015-09-08 15:00:07 -0700 | [diff] [blame] | 1460 | /* do not disclose physical addresses: attack vector */ |
| 1461 | pm.show_pfn = file_ns_capable(file, &init_user_ns, CAP_SYS_ADMIN); |
| 1462 | |
yonghua zheng | 8c82962 | 2013-08-13 16:01:03 -0700 | [diff] [blame] | 1463 | pm.len = (PAGEMAP_WALK_SIZE >> PAGE_SHIFT); |
Michal Hocko | 0ee931c | 2017-09-13 16:28:29 -0700 | [diff] [blame] | 1464 | pm.buffer = kmalloc(pm.len * PM_ENTRY_BYTES, GFP_KERNEL); |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1465 | ret = -ENOMEM; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1466 | if (!pm.buffer) |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1467 | goto out_mm; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1468 | |
Konstantin Khlebnikov | 356515e | 2015-09-08 15:00:04 -0700 | [diff] [blame] | 1469 | pagemap_walk.pmd_entry = pagemap_pmd_range; |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1470 | pagemap_walk.pte_hole = pagemap_pte_hole; |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1471 | #ifdef CONFIG_HUGETLB_PAGE |
Naoya Horiguchi | 5dc3764 | 2009-12-14 18:00:01 -0800 | [diff] [blame] | 1472 | pagemap_walk.hugetlb_entry = pagemap_hugetlb_range; |
Naoya Horiguchi | 1a5cb81 | 2010-05-24 14:32:12 -0700 | [diff] [blame] | 1473 | #endif |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1474 | pagemap_walk.mm = mm; |
| 1475 | pagemap_walk.private = ± |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1476 | |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1477 | src = *ppos; |
| 1478 | svpfn = src / PM_ENTRY_BYTES; |
| 1479 | start_vaddr = svpfn << PAGE_SHIFT; |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1480 | end_vaddr = mm->task_size; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1481 | |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1482 | /* watch out for wraparound */ |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1483 | if (svpfn > mm->task_size >> PAGE_SHIFT) |
Andrew Morton | 5d7e0d2 | 2008-07-05 01:02:01 -0700 | [diff] [blame] | 1484 | start_vaddr = end_vaddr; |
| 1485 | |
| 1486 | /* |
| 1487 | * The odds are that this will stop walking way |
| 1488 | * before end_vaddr, because the length of the |
| 1489 | * user buffer is tracked in "pm", and the walk |
| 1490 | * will stop when we hit the end of the buffer. |
| 1491 | */ |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1492 | ret = 0; |
| 1493 | while (count && (start_vaddr < end_vaddr)) { |
| 1494 | int len; |
| 1495 | unsigned long end; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1496 | |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1497 | pm.pos = 0; |
Naoya Horiguchi | ea251c1 | 2010-11-24 12:57:13 -0800 | [diff] [blame] | 1498 | end = (start_vaddr + PAGEMAP_WALK_SIZE) & PAGEMAP_WALK_MASK; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1499 | /* overflow ? */ |
| 1500 | if (end < start_vaddr || end > end_vaddr) |
| 1501 | end = end_vaddr; |
| 1502 | down_read(&mm->mmap_sem); |
| 1503 | ret = walk_page_range(start_vaddr, end, &pagemap_walk); |
| 1504 | up_read(&mm->mmap_sem); |
| 1505 | start_vaddr = end; |
| 1506 | |
| 1507 | len = min(count, PM_ENTRY_BYTES * pm.pos); |
Dan Carpenter | 309361e0 | 2010-04-06 13:45:39 +0300 | [diff] [blame] | 1508 | if (copy_to_user(buf, pm.buffer, len)) { |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1509 | ret = -EFAULT; |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1510 | goto out_free; |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1511 | } |
| 1512 | copied += len; |
| 1513 | buf += len; |
| 1514 | count -= len; |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1515 | } |
KAMEZAWA Hiroyuki | d82ef02 | 2010-04-02 09:11:29 +0900 | [diff] [blame] | 1516 | *ppos += copied; |
| 1517 | if (!ret || ret == PM_END_OF_BUFFER) |
| 1518 | ret = copied; |
| 1519 | |
KOSAKI Motohiro | 98bc93e | 2011-05-26 16:25:53 -0700 | [diff] [blame] | 1520 | out_free: |
| 1521 | kfree(pm.buffer); |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1522 | out_mm: |
| 1523 | mmput(mm); |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1524 | out: |
| 1525 | return ret; |
| 1526 | } |
| 1527 | |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1528 | static int pagemap_open(struct inode *inode, struct file *file) |
| 1529 | { |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1530 | struct mm_struct *mm; |
| 1531 | |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1532 | mm = proc_mem_open(inode, PTRACE_MODE_READ); |
| 1533 | if (IS_ERR(mm)) |
| 1534 | return PTR_ERR(mm); |
| 1535 | file->private_data = mm; |
| 1536 | return 0; |
| 1537 | } |
| 1538 | |
| 1539 | static int pagemap_release(struct inode *inode, struct file *file) |
| 1540 | { |
| 1541 | struct mm_struct *mm = file->private_data; |
| 1542 | |
| 1543 | if (mm) |
| 1544 | mmdrop(mm); |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1545 | return 0; |
| 1546 | } |
| 1547 | |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1548 | const struct file_operations proc_pagemap_operations = { |
| 1549 | .llseek = mem_lseek, /* borrow this */ |
| 1550 | .read = pagemap_read, |
Pavel Emelyanov | 541c237 | 2013-07-03 15:01:22 -0700 | [diff] [blame] | 1551 | .open = pagemap_open, |
Konstantin Khlebnikov | a06db75 | 2015-09-08 14:59:59 -0700 | [diff] [blame] | 1552 | .release = pagemap_release, |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1553 | }; |
Matt Mackall | 1e88328 | 2008-02-04 22:29:07 -0800 | [diff] [blame] | 1554 | #endif /* CONFIG_PROC_PAGE_MONITOR */ |
Matt Mackall | 85863e4 | 2008-02-04 22:29:04 -0800 | [diff] [blame] | 1555 | |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1556 | #ifdef CONFIG_NUMA |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1557 | |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1558 | struct numa_maps { |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1559 | unsigned long pages; |
| 1560 | unsigned long anon; |
| 1561 | unsigned long active; |
| 1562 | unsigned long writeback; |
| 1563 | unsigned long mapcount_max; |
| 1564 | unsigned long dirty; |
| 1565 | unsigned long swapcache; |
| 1566 | unsigned long node[MAX_NUMNODES]; |
| 1567 | }; |
| 1568 | |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1569 | struct numa_maps_private { |
| 1570 | struct proc_maps_private proc_maps; |
| 1571 | struct numa_maps md; |
| 1572 | }; |
| 1573 | |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1574 | static void gather_stats(struct page *page, struct numa_maps *md, int pte_dirty, |
| 1575 | unsigned long nr_pages) |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1576 | { |
| 1577 | int count = page_mapcount(page); |
| 1578 | |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1579 | md->pages += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1580 | if (pte_dirty || PageDirty(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1581 | md->dirty += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1582 | |
| 1583 | if (PageSwapCache(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1584 | md->swapcache += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1585 | |
| 1586 | if (PageActive(page) || PageUnevictable(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1587 | md->active += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1588 | |
| 1589 | if (PageWriteback(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1590 | md->writeback += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1591 | |
| 1592 | if (PageAnon(page)) |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1593 | md->anon += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1594 | |
| 1595 | if (count > md->mapcount_max) |
| 1596 | md->mapcount_max = count; |
| 1597 | |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1598 | md->node[page_to_nid(page)] += nr_pages; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1599 | } |
| 1600 | |
Dave Hansen | 3200a8a | 2011-09-20 15:19:39 -0700 | [diff] [blame] | 1601 | static struct page *can_gather_numa_stats(pte_t pte, struct vm_area_struct *vma, |
| 1602 | unsigned long addr) |
| 1603 | { |
| 1604 | struct page *page; |
| 1605 | int nid; |
| 1606 | |
| 1607 | if (!pte_present(pte)) |
| 1608 | return NULL; |
| 1609 | |
| 1610 | page = vm_normal_page(vma, addr, pte); |
| 1611 | if (!page) |
| 1612 | return NULL; |
| 1613 | |
| 1614 | if (PageReserved(page)) |
| 1615 | return NULL; |
| 1616 | |
| 1617 | nid = page_to_nid(page); |
Lai Jiangshan | 4ff1b2c | 2012-12-12 13:51:25 -0800 | [diff] [blame] | 1618 | if (!node_isset(nid, node_states[N_MEMORY])) |
Dave Hansen | 3200a8a | 2011-09-20 15:19:39 -0700 | [diff] [blame] | 1619 | return NULL; |
| 1620 | |
| 1621 | return page; |
| 1622 | } |
| 1623 | |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1624 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
| 1625 | static struct page *can_gather_numa_stats_pmd(pmd_t pmd, |
| 1626 | struct vm_area_struct *vma, |
| 1627 | unsigned long addr) |
| 1628 | { |
| 1629 | struct page *page; |
| 1630 | int nid; |
| 1631 | |
| 1632 | if (!pmd_present(pmd)) |
| 1633 | return NULL; |
| 1634 | |
| 1635 | page = vm_normal_page_pmd(vma, addr, pmd); |
| 1636 | if (!page) |
| 1637 | return NULL; |
| 1638 | |
| 1639 | if (PageReserved(page)) |
| 1640 | return NULL; |
| 1641 | |
| 1642 | nid = page_to_nid(page); |
| 1643 | if (!node_isset(nid, node_states[N_MEMORY])) |
| 1644 | return NULL; |
| 1645 | |
| 1646 | return page; |
| 1647 | } |
| 1648 | #endif |
| 1649 | |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1650 | static int gather_pte_stats(pmd_t *pmd, unsigned long addr, |
| 1651 | unsigned long end, struct mm_walk *walk) |
| 1652 | { |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1653 | struct numa_maps *md = walk->private; |
| 1654 | struct vm_area_struct *vma = walk->vma; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1655 | spinlock_t *ptl; |
| 1656 | pte_t *orig_pte; |
| 1657 | pte_t *pte; |
| 1658 | |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1659 | #ifdef CONFIG_TRANSPARENT_HUGEPAGE |
Kirill A. Shutemov | b6ec57f | 2016-01-21 16:40:25 -0800 | [diff] [blame] | 1660 | ptl = pmd_trans_huge_lock(pmd, vma); |
| 1661 | if (ptl) { |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1662 | struct page *page; |
| 1663 | |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1664 | page = can_gather_numa_stats_pmd(*pmd, vma, addr); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1665 | if (page) |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1666 | gather_stats(page, md, pmd_dirty(*pmd), |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1667 | HPAGE_PMD_SIZE/PAGE_SIZE); |
Kirill A. Shutemov | bf92915 | 2013-11-14 14:30:54 -0800 | [diff] [blame] | 1668 | spin_unlock(ptl); |
Naoya Horiguchi | 025c5b2 | 2012-03-21 16:33:57 -0700 | [diff] [blame] | 1669 | return 0; |
Dave Hansen | 32ef438 | 2011-09-20 15:19:41 -0700 | [diff] [blame] | 1670 | } |
| 1671 | |
Andrea Arcangeli | 1a5a990 | 2012-03-21 16:33:42 -0700 | [diff] [blame] | 1672 | if (pmd_trans_unstable(pmd)) |
| 1673 | return 0; |
Gerald Schaefer | 28093f9 | 2016-04-28 16:18:35 -0700 | [diff] [blame] | 1674 | #endif |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1675 | orig_pte = pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); |
| 1676 | do { |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1677 | struct page *page = can_gather_numa_stats(*pte, vma, addr); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1678 | if (!page) |
| 1679 | continue; |
Dave Hansen | eb4866d | 2011-09-20 15:19:38 -0700 | [diff] [blame] | 1680 | gather_stats(page, md, pte_dirty(*pte), 1); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1681 | |
| 1682 | } while (pte++, addr += PAGE_SIZE, addr != end); |
| 1683 | pte_unmap_unlock(orig_pte, ptl); |
Hugh Dickins | a66c0410 | 2016-12-12 16:44:47 -0800 | [diff] [blame] | 1684 | cond_resched(); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1685 | return 0; |
| 1686 | } |
| 1687 | #ifdef CONFIG_HUGETLB_PAGE |
Naoya Horiguchi | 632fd60 | 2015-02-11 15:27:51 -0800 | [diff] [blame] | 1688 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1689 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
| 1690 | { |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1691 | pte_t huge_pte = huge_ptep_get(pte); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1692 | struct numa_maps *md; |
| 1693 | struct page *page; |
| 1694 | |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1695 | if (!pte_present(huge_pte)) |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1696 | return 0; |
| 1697 | |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1698 | page = pte_page(huge_pte); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1699 | if (!page) |
| 1700 | return 0; |
| 1701 | |
| 1702 | md = walk->private; |
Michael Holzheu | 5c2ff95 | 2016-02-02 16:57:26 -0800 | [diff] [blame] | 1703 | gather_stats(page, md, pte_dirty(huge_pte), 1); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1704 | return 0; |
| 1705 | } |
| 1706 | |
| 1707 | #else |
Naoya Horiguchi | 632fd60 | 2015-02-11 15:27:51 -0800 | [diff] [blame] | 1708 | static int gather_hugetlb_stats(pte_t *pte, unsigned long hmask, |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1709 | unsigned long addr, unsigned long end, struct mm_walk *walk) |
| 1710 | { |
| 1711 | return 0; |
| 1712 | } |
| 1713 | #endif |
| 1714 | |
| 1715 | /* |
| 1716 | * Display pages allocated per node and memory policy via /proc. |
| 1717 | */ |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1718 | static int show_numa_map(struct seq_file *m, void *v, int is_pid) |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1719 | { |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1720 | struct numa_maps_private *numa_priv = m->private; |
| 1721 | struct proc_maps_private *proc_priv = &numa_priv->proc_maps; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1722 | struct vm_area_struct *vma = v; |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1723 | struct numa_maps *md = &numa_priv->md; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1724 | struct file *file = vma->vm_file; |
| 1725 | struct mm_struct *mm = vma->vm_mm; |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1726 | struct mm_walk walk = { |
| 1727 | .hugetlb_entry = gather_hugetlb_stats, |
| 1728 | .pmd_entry = gather_pte_stats, |
| 1729 | .private = md, |
| 1730 | .mm = mm, |
| 1731 | }; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1732 | struct mempolicy *pol; |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 1733 | char buffer[64]; |
| 1734 | int nid; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1735 | |
| 1736 | if (!mm) |
| 1737 | return 0; |
| 1738 | |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1739 | /* Ensure we start with an empty set of numa_maps statistics. */ |
| 1740 | memset(md, 0, sizeof(*md)); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1741 | |
Oleg Nesterov | 498f237 | 2014-10-09 15:27:52 -0700 | [diff] [blame] | 1742 | pol = __get_vma_policy(vma, vma->vm_start); |
| 1743 | if (pol) { |
| 1744 | mpol_to_str(buffer, sizeof(buffer), pol); |
| 1745 | mpol_cond_put(pol); |
| 1746 | } else { |
| 1747 | mpol_to_str(buffer, sizeof(buffer), proc_priv->task_mempolicy); |
| 1748 | } |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1749 | |
| 1750 | seq_printf(m, "%08lx %s", vma->vm_start, buffer); |
| 1751 | |
| 1752 | if (file) { |
Fabian Frederick | 17c2b4e | 2014-06-06 14:37:03 -0700 | [diff] [blame] | 1753 | seq_puts(m, " file="); |
Miklos Szeredi | 2726d56 | 2015-06-19 10:30:28 +0200 | [diff] [blame] | 1754 | seq_file_path(m, file, "\n\t= "); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1755 | } else if (vma->vm_start <= mm->brk && vma->vm_end >= mm->start_brk) { |
Fabian Frederick | 17c2b4e | 2014-06-06 14:37:03 -0700 | [diff] [blame] | 1756 | seq_puts(m, " heap"); |
Michal Hocko | 1240ea0 | 2017-09-08 16:13:35 -0700 | [diff] [blame] | 1757 | } else if (is_stack(vma)) { |
Johannes Weiner | 65376df | 2016-02-02 16:57:29 -0800 | [diff] [blame] | 1758 | seq_puts(m, " stack"); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1759 | } |
| 1760 | |
Andrew Morton | fc360bd | 2011-10-31 17:06:32 -0700 | [diff] [blame] | 1761 | if (is_vm_hugetlb_page(vma)) |
Fabian Frederick | 17c2b4e | 2014-06-06 14:37:03 -0700 | [diff] [blame] | 1762 | seq_puts(m, " huge"); |
Andrew Morton | fc360bd | 2011-10-31 17:06:32 -0700 | [diff] [blame] | 1763 | |
Naoya Horiguchi | d85f4d6 | 2015-02-11 15:27:54 -0800 | [diff] [blame] | 1764 | /* mmap_sem is held by m_start */ |
| 1765 | walk_page_vma(vma, &walk); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1766 | |
| 1767 | if (!md->pages) |
| 1768 | goto out; |
| 1769 | |
| 1770 | if (md->anon) |
| 1771 | seq_printf(m, " anon=%lu", md->anon); |
| 1772 | |
| 1773 | if (md->dirty) |
| 1774 | seq_printf(m, " dirty=%lu", md->dirty); |
| 1775 | |
| 1776 | if (md->pages != md->anon && md->pages != md->dirty) |
| 1777 | seq_printf(m, " mapped=%lu", md->pages); |
| 1778 | |
| 1779 | if (md->mapcount_max > 1) |
| 1780 | seq_printf(m, " mapmax=%lu", md->mapcount_max); |
| 1781 | |
| 1782 | if (md->swapcache) |
| 1783 | seq_printf(m, " swapcache=%lu", md->swapcache); |
| 1784 | |
| 1785 | if (md->active < md->pages && !is_vm_hugetlb_page(vma)) |
| 1786 | seq_printf(m, " active=%lu", md->active); |
| 1787 | |
| 1788 | if (md->writeback) |
| 1789 | seq_printf(m, " writeback=%lu", md->writeback); |
| 1790 | |
David Rientjes | 948927e | 2013-11-12 15:07:28 -0800 | [diff] [blame] | 1791 | for_each_node_state(nid, N_MEMORY) |
| 1792 | if (md->node[nid]) |
| 1793 | seq_printf(m, " N%d=%lu", nid, md->node[nid]); |
Rafael Aquini | 198d159 | 2015-02-12 15:01:08 -0800 | [diff] [blame] | 1794 | |
| 1795 | seq_printf(m, " kernelpagesize_kB=%lu", vma_kernel_pagesize(vma) >> 10); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1796 | out: |
| 1797 | seq_putc(m, '\n'); |
Oleg Nesterov | b8c20a9 | 2014-10-09 15:25:41 -0700 | [diff] [blame] | 1798 | m_cache_vma(m, vma); |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1799 | return 0; |
| 1800 | } |
Stephen Wilson | 5b52fc8 | 2011-05-24 17:12:49 -0700 | [diff] [blame] | 1801 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1802 | static int show_pid_numa_map(struct seq_file *m, void *v) |
| 1803 | { |
| 1804 | return show_numa_map(m, v, 1); |
| 1805 | } |
| 1806 | |
| 1807 | static int show_tid_numa_map(struct seq_file *m, void *v) |
| 1808 | { |
| 1809 | return show_numa_map(m, v, 0); |
| 1810 | } |
| 1811 | |
Jan Engelhardt | 03a4482 | 2008-02-08 04:21:19 -0800 | [diff] [blame] | 1812 | static const struct seq_operations proc_pid_numa_maps_op = { |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1813 | .start = m_start, |
| 1814 | .next = m_next, |
| 1815 | .stop = m_stop, |
| 1816 | .show = show_pid_numa_map, |
Christoph Lameter | 6e21c8f | 2005-09-03 15:54:45 -0700 | [diff] [blame] | 1817 | }; |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1818 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1819 | static const struct seq_operations proc_tid_numa_maps_op = { |
| 1820 | .start = m_start, |
| 1821 | .next = m_next, |
| 1822 | .stop = m_stop, |
| 1823 | .show = show_tid_numa_map, |
| 1824 | }; |
| 1825 | |
| 1826 | static int numa_maps_open(struct inode *inode, struct file *file, |
| 1827 | const struct seq_operations *ops) |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1828 | { |
Oleg Nesterov | 4db7d0e | 2014-10-09 15:25:21 -0700 | [diff] [blame] | 1829 | return proc_maps_open(inode, file, ops, |
| 1830 | sizeof(struct numa_maps_private)); |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1831 | } |
| 1832 | |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1833 | static int pid_numa_maps_open(struct inode *inode, struct file *file) |
| 1834 | { |
| 1835 | return numa_maps_open(inode, file, &proc_pid_numa_maps_op); |
| 1836 | } |
| 1837 | |
| 1838 | static int tid_numa_maps_open(struct inode *inode, struct file *file) |
| 1839 | { |
| 1840 | return numa_maps_open(inode, file, &proc_tid_numa_maps_op); |
| 1841 | } |
| 1842 | |
| 1843 | const struct file_operations proc_pid_numa_maps_operations = { |
| 1844 | .open = pid_numa_maps_open, |
| 1845 | .read = seq_read, |
| 1846 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 1847 | .release = proc_map_release, |
Siddhesh Poyarekar | b764375 | 2012-03-21 16:34:04 -0700 | [diff] [blame] | 1848 | }; |
| 1849 | |
| 1850 | const struct file_operations proc_tid_numa_maps_operations = { |
| 1851 | .open = tid_numa_maps_open, |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1852 | .read = seq_read, |
| 1853 | .llseek = seq_lseek, |
Oleg Nesterov | 29a40ac | 2014-10-09 15:25:26 -0700 | [diff] [blame] | 1854 | .release = proc_map_release, |
Eric W. Biederman | 662795d | 2006-06-26 00:25:48 -0700 | [diff] [blame] | 1855 | }; |
Stephen Wilson | f69ff94 | 2011-05-24 17:12:47 -0700 | [diff] [blame] | 1856 | #endif /* CONFIG_NUMA */ |