Commit 03d864c0 authored by Daniel Phillips's avatar Daniel Phillips Committed by Mark Fasheh
Browse files

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: default avatarDaniel Phillips <phillips@google.com>
Signed-off-by: default avatarMark Fasheh <mark.fasheh@oracle.com>
parent 95c4f581
......@@ -37,7 +37,10 @@
#define DLM_THREAD_SHUFFLE_INTERVAL 5 // flush everything every 5 passes
#define DLM_THREAD_MS 200 // flush at least every 200 ms
#define DLM_HASH_BUCKETS (PAGE_SIZE / sizeof(struct hlist_head))
#define DLM_HASH_SIZE (1 << 14)
#define DLM_HASH_PAGES (DLM_HASH_SIZE / PAGE_SIZE)
#define DLM_BUCKETS_PER_PAGE (PAGE_SIZE / sizeof(struct hlist_head))
#define DLM_HASH_BUCKETS (DLM_HASH_PAGES * DLM_BUCKETS_PER_PAGE)
/* Intended to make it easier for us to switch out hash functions */
#define dlm_lockid_hash(_n, _l) full_name_hash(_n, _l)
......@@ -88,7 +91,7 @@ enum dlm_ctxt_state {
struct dlm_ctxt
{
struct list_head list;
struct hlist_head *lockres_hash;
struct hlist_head **lockres_hash;
struct list_head dirty_list;
struct list_head purge_list;
struct list_head pending_asts;
......@@ -135,6 +138,11 @@ struct dlm_ctxt
struct list_head dlm_eviction_callbacks;
};
static inline struct hlist_head *dlm_lockres_hash(struct dlm_ctxt *dlm, unsigned i)
{
return dlm->lockres_hash[(i / DLM_BUCKETS_PER_PAGE) % DLM_HASH_PAGES] + (i % DLM_BUCKETS_PER_PAGE);
}
/* these keventd work queue items are for less-frequently
* called functions that cannot be directly called from the
* net message handlers for some reason, usually because
......
......@@ -136,7 +136,7 @@ void dlm_dump_lock_resources(struct dlm_ctxt *dlm)
spin_lock(&dlm->spinlock);
for (i=0; i<DLM_HASH_BUCKETS; i++) {
bucket = &(dlm->lockres_hash[i]);
bucket = dlm_lockres_hash(dlm, i);
hlist_for_each_entry(res, iter, bucket, hash_node)
dlm_print_one_lock_resource(res);
}
......
......@@ -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 @@ void __dlm_insert_lockres(struct dlm_ctxt *dlm,
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 @@ struct dlm_lock_resource * __dlm_lookup_lockres(struct dlm_ctxt *dlm,
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 int dlm_wait_on_domain_helper(const char *domain)
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 @@ static void dlm_migrate_all_locks(struct dlm_ctxt *dlm)
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 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
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 @@ static struct dlm_ctxt *dlm_alloc_ctxt(const char *domain,
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;
......
......@@ -1719,7 +1719,7 @@ static void dlm_finish_local_lockres_recovery(struct dlm_ctxt *dlm,
* the RECOVERING state and set the owner
* if necessary */
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
bucket = &(dlm->lockres_hash[i]);
bucket = dlm_lockres_hash(dlm, i);
hlist_for_each_entry(res, hash_iter, bucket, hash_node) {
if (res->state & DLM_LOCK_RES_RECOVERING) {
if (res->owner == dead_node) {
......@@ -1884,7 +1884,7 @@ static void dlm_do_local_recovery_cleanup(struct dlm_ctxt *dlm, u8 dead_node)
* need to be fired as a result.
*/
for (i = 0; i < DLM_HASH_BUCKETS; i++) {
bucket = &(dlm->lockres_hash[i]);
bucket = dlm_lockres_hash(dlm, i);
hlist_for_each_entry(res, iter, bucket, hash_node) {
/* always prune any $RECOVERY entries for dead nodes,
* otherwise hangs can occur during later recovery */
......
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