ocfs2: allocate lockres hash pages in an array
This allows us to have a hash table greater than a single page which greatly
improves dlm performance on some tests.
Signed-off-by: Daniel Phillips <phillips@google.com>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>
diff --git a/fs/ocfs2/dlm/dlmdomain.c b/fs/ocfs2/dlm/dlmdomain.c
index 595b1c7..80b8cce 100644
--- a/fs/ocfs2/dlm/dlmdomain.c
+++ b/fs/ocfs2/dlm/dlmdomain.c
@@ -49,6 +49,30 @@
#define MLOG_MASK_PREFIX (ML_DLM|ML_DLM_DOMAIN)
#include "cluster/masklog.h"
+static void dlm_free_pagevec(void **vec, int pages)
+{
+ while (pages--)
+ free_page((unsigned long)vec[pages]);
+ kfree(vec);
+}
+
+static void **dlm_alloc_pagevec(int pages)
+{
+ void **vec = kmalloc(pages * sizeof(void *), GFP_KERNEL);
+ int i;
+
+ if (!vec)
+ return NULL;
+
+ for (i = 0; i < pages; i++)
+ if (!(vec[i] = (void *)__get_free_page(GFP_KERNEL)))
+ goto out_free;
+ return vec;
+out_free:
+ dlm_free_pagevec(vec, i);
+ return NULL;
+}
+
/*
*
* spinlock lock ordering: if multiple locks are needed, obey this ordering:
@@ -90,7 +114,7 @@
assert_spin_locked(&dlm->spinlock);
q = &res->lockname;
- bucket = &(dlm->lockres_hash[q->hash % DLM_HASH_BUCKETS]);
+ bucket = dlm_lockres_hash(dlm, q->hash);
/* get a reference for our hashtable */
dlm_lockres_get(res);
@@ -110,7 +134,8 @@
assert_spin_locked(&dlm->spinlock);
- bucket = dlm->lockres_hash + full_name_hash(name, len) % DLM_HASH_BUCKETS;
+ bucket = dlm_lockres_hash(dlm, hash);
+
hlist_for_each(list, bucket) {
struct dlm_lock_resource *res = hlist_entry(list,
struct dlm_lock_resource, hash_node);
@@ -191,7 +216,7 @@
static void dlm_free_ctxt_mem(struct dlm_ctxt *dlm)
{
if (dlm->lockres_hash)
- free_page((unsigned long) dlm->lockres_hash);
+ dlm_free_pagevec((void **)dlm->lockres_hash, DLM_HASH_PAGES);
if (dlm->name)
kfree(dlm->name);
@@ -301,8 +326,8 @@
restart:
spin_lock(&dlm->spinlock);
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
- while (!hlist_empty(&dlm->lockres_hash[i])) {
- res = hlist_entry(dlm->lockres_hash[i].first,
+ while (!hlist_empty(dlm_lockres_hash(dlm, i))) {
+ res = hlist_entry(dlm_lockres_hash(dlm, i)->first,
struct dlm_lock_resource, hash_node);
/* need reference when manually grabbing lockres */
dlm_lockres_get(res);
@@ -1188,7 +1213,7 @@
goto leave;
}
- dlm->lockres_hash = (struct hlist_head *) __get_free_page(GFP_KERNEL);
+ dlm->lockres_hash = (struct hlist_head **)dlm_alloc_pagevec(DLM_HASH_PAGES);
if (!dlm->lockres_hash) {
mlog_errno(-ENOMEM);
kfree(dlm->name);
@@ -1197,8 +1222,8 @@
goto leave;
}
- for (i=0; i<DLM_HASH_BUCKETS; i++)
- INIT_HLIST_HEAD(&dlm->lockres_hash[i]);
+ for (i = 0; i < DLM_HASH_BUCKETS; i++)
+ INIT_HLIST_HEAD(dlm_lockres_hash(dlm, i));
strcpy(dlm->name, domain);
dlm->key = key;