mm: kill vma flag VM_RESERVED and mm->reserved_vm counter
A long time ago, in v2.4, VM_RESERVED kept swapout process off VMA,
currently it lost original meaning but still has some effects:
| effect | alternative flags
-+------------------------+---------------------------------------------
1| account as reserved_vm | VM_IO
2| skip in core dump | VM_IO, VM_DONTDUMP
3| do not merge or expand | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP
4| do not mlock | VM_IO, VM_DONTEXPAND, VM_HUGETLB, VM_PFNMAP
This patch removes reserved_vm counter from mm_struct. Seems like nobody
cares about it, it does not exported into userspace directly, it only
reduces total_vm showed in proc.
Thus VM_RESERVED can be replaced with VM_IO or pair VM_DONTEXPAND | VM_DONTDUMP.
remap_pfn_range() and io_remap_pfn_range() set VM_IO|VM_DONTEXPAND|VM_DONTDUMP.
remap_vmalloc_range() set VM_DONTEXPAND | VM_DONTDUMP.
[akpm@linux-foundation.org: drivers/vfio/pci/vfio_pci.c fixup]
Signed-off-by: Konstantin Khlebnikov <khlebnikov@openvz.org>
Cc: Alexander Viro <viro@zeniv.linux.org.uk>
Cc: Carsten Otte <cotte@de.ibm.com>
Cc: Chris Metcalf <cmetcalf@tilera.com>
Cc: Cyrill Gorcunov <gorcunov@openvz.org>
Cc: Eric Paris <eparis@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Hugh Dickins <hughd@google.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: James Morris <james.l.morris@oracle.com>
Cc: Jason Baron <jbaron@redhat.com>
Cc: Kentaro Takeda <takedakn@nttdata.co.jp>
Cc: Matt Helsley <matthltc@us.ibm.com>
Cc: Nick Piggin <npiggin@kernel.dk>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Robert Richter <robert.richter@amd.com>
Cc: Suresh Siddha <suresh.b.siddha@intel.com>
Cc: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Cc: Venkatesh Pallipadi <venki@google.com>
Acked-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/drivers/video/68328fb.c b/drivers/video/68328fb.c
index a425d65..fa44fbe 100644
--- a/drivers/video/68328fb.c
+++ b/drivers/video/68328fb.c
@@ -400,7 +400,7 @@
#ifndef MMU
/* this is uClinux (no MMU) specific code */
- vma->vm_flags |= VM_RESERVED;
+ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
vma->vm_start = videomemory;
return 0;
diff --git a/drivers/video/aty/atyfb_base.c b/drivers/video/aty/atyfb_base.c
index 3f2e8c1..868932f 100644
--- a/drivers/video/aty/atyfb_base.c
+++ b/drivers/video/aty/atyfb_base.c
@@ -1942,8 +1942,7 @@
off = vma->vm_pgoff << PAGE_SHIFT;
size = vma->vm_end - vma->vm_start;
- /* To stop the swapper from even considering these pages. */
- vma->vm_flags |= (VM_IO | VM_RESERVED);
+ /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
if (((vma->vm_pgoff == 0) && (size == info->fix.smem_len)) ||
((off == info->fix.smem_len) && (size == PAGE_SIZE)))
diff --git a/drivers/video/fb-puv3.c b/drivers/video/fb-puv3.c
index 60a787f..7d106f1f 100644
--- a/drivers/video/fb-puv3.c
+++ b/drivers/video/fb-puv3.c
@@ -653,9 +653,8 @@
vma->vm_page_prot))
return -EAGAIN;
- vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
+ /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
return 0;
-
}
static struct fb_ops unifb_ops = {
diff --git a/drivers/video/fb_defio.c b/drivers/video/fb_defio.c
index 64cda56..88cad6b 100644
--- a/drivers/video/fb_defio.c
+++ b/drivers/video/fb_defio.c
@@ -166,7 +166,7 @@
static int fb_deferred_io_mmap(struct fb_info *info, struct vm_area_struct *vma)
{
vma->vm_ops = &fb_deferred_io_vm_ops;
- vma->vm_flags |= ( VM_RESERVED | VM_DONTEXPAND );
+ vma->vm_flags |= VM_DONTEXPAND | VM_DONTDUMP;
if (!(info->flags & FBINFO_VIRTFB))
vma->vm_flags |= VM_IO;
vma->vm_private_data = info;
diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c
index 0dff12a..3ff0105 100644
--- a/drivers/video/fbmem.c
+++ b/drivers/video/fbmem.c
@@ -1410,8 +1410,7 @@
return -EINVAL;
off += start;
vma->vm_pgoff = off >> PAGE_SHIFT;
- /* This is an IO map - tell maydump to skip this VMA */
- vma->vm_flags |= VM_IO | VM_RESERVED;
+ /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by io_remap_pfn_range()*/
vma->vm_page_prot = vm_get_page_prot(vma->vm_flags);
fb_pgprotect(file, vma, off);
if (io_remap_pfn_range(vma, vma->vm_start, off >> PAGE_SHIFT,
diff --git a/drivers/video/gbefb.c b/drivers/video/gbefb.c
index 7e7b7a9..05e2a8a 100644
--- a/drivers/video/gbefb.c
+++ b/drivers/video/gbefb.c
@@ -1024,7 +1024,7 @@
pgprot_val(vma->vm_page_prot) =
pgprot_fb(pgprot_val(vma->vm_page_prot));
- vma->vm_flags |= VM_IO | VM_RESERVED;
+ /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
/* look for the starting tile */
tile = &gbe_tiles.cpu[offset >> TILE_SHIFT];
diff --git a/drivers/video/omap2/omapfb/omapfb-main.c b/drivers/video/omap2/omapfb/omapfb-main.c
index 3c39aa8..15373f4 100644
--- a/drivers/video/omap2/omapfb/omapfb-main.c
+++ b/drivers/video/omap2/omapfb/omapfb-main.c
@@ -1128,7 +1128,7 @@
DBG("user mmap region start %lx, len %d, off %lx\n", start, len, off);
vma->vm_pgoff = off >> PAGE_SHIFT;
- vma->vm_flags |= VM_IO | VM_RESERVED;
+ /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
vma->vm_page_prot = pgprot_writecombine(vma->vm_page_prot);
vma->vm_ops = &mmap_user_ops;
vma->vm_private_data = rg;
diff --git a/drivers/video/sbuslib.c b/drivers/video/sbuslib.c
index 3c1de98..296afae 100644
--- a/drivers/video/sbuslib.c
+++ b/drivers/video/sbuslib.c
@@ -57,9 +57,8 @@
off = vma->vm_pgoff << PAGE_SHIFT;
- /* To stop the swapper from even considering these pages */
- vma->vm_flags |= (VM_IO | VM_RESERVED);
-
+ /* VM_IO | VM_DONTEXPAND | VM_DONTDUMP are set by remap_pfn_range() */
+
vma->vm_page_prot = pgprot_noncached(vma->vm_page_prot);
/* Each page, see which map applies */
diff --git a/drivers/video/smscufx.c b/drivers/video/smscufx.c
index 5533a32..97bd662 100644
--- a/drivers/video/smscufx.c
+++ b/drivers/video/smscufx.c
@@ -803,7 +803,6 @@
size = 0;
}
- vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
return 0;
}
diff --git a/drivers/video/udlfb.c b/drivers/video/udlfb.c
index 8af6414..f45eba3 100644
--- a/drivers/video/udlfb.c
+++ b/drivers/video/udlfb.c
@@ -345,7 +345,6 @@
size = 0;
}
- vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
return 0;
}
diff --git a/drivers/video/vermilion/vermilion.c b/drivers/video/vermilion/vermilion.c
index 970e43d..89aef34 100644
--- a/drivers/video/vermilion/vermilion.c
+++ b/drivers/video/vermilion/vermilion.c
@@ -1018,7 +1018,6 @@
offset += vinfo->vram_start;
pgprot_val(vma->vm_page_prot) |= _PAGE_PCD;
pgprot_val(vma->vm_page_prot) &= ~_PAGE_PWT;
- vma->vm_flags |= VM_RESERVED | VM_IO;
if (remap_pfn_range(vma, vma->vm_start, offset >> PAGE_SHIFT,
size, vma->vm_page_prot))
return -EAGAIN;
diff --git a/drivers/video/vfb.c b/drivers/video/vfb.c
index 501a922..c7f69252 100644
--- a/drivers/video/vfb.c
+++ b/drivers/video/vfb.c
@@ -439,7 +439,6 @@
size = 0;
}
- vma->vm_flags |= VM_RESERVED; /* avoid to swap out this VMA */
return 0;
}