xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

dlm: convert rsb list to rb_tree

Browse Source 
Change the linked lists to rb_tree's in the rsb
hash table to speed up searches.  Slow rsb searches
were having a large impact on gfs2 performance due
to the large number of dlm locks gfs2 uses.

Signed-off-by: Bob Peterson <rpeterso@redhat.com>
Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
Bob Peterson
2011-10-26 15:24:55 -05:00
committed by David Teigland
parent c3b92c8787
commit 9beb3bf5a9
5 changed files with 112 additions and 54 deletions
Download Patch File Download Diff File Expand all files Collapse all files

85
fs/dlm/lock.c
View File

@@ -56,6 +56,7 @@
L: receive_xxxx_reply() <- R: send_xxxx_reply()
*/
#include <linux/types.h>
#include <linux/rbtree.h>
#include <linux/slab.h>
#include "dlm_internal.h"
#include <linux/dlm_device.h>
@@ -380,6 +381,8 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
r = list_first_entry(&ls->ls_new_rsb, struct dlm_rsb, res_hashchain);
list_del(&r->res_hashchain);
/* Convert the empty list_head to a NULL rb_node for tree usage: */
memset(&r->res_hashnode, 0, sizeof(struct rb_node));
ls->ls_new_rsb_count--;
spin_unlock(&ls->ls_new_rsb_spin);
@@ -388,7 +391,6 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
memcpy(r->res_name, name, len);
mutex_init(&r->res_mutex);
INIT_LIST_HEAD(&r->res_hashchain);
INIT_LIST_HEAD(&r->res_lookup);
INIT_LIST_HEAD(&r->res_grantqueue);
INIT_LIST_HEAD(&r->res_convertqueue);
@@ -400,14 +402,31 @@ static int get_rsb_struct(struct dlm_ls *ls, char *name, int len,
return 0;
}
static int search_rsb_list(struct list_head *head, char *name, int len,
static int rsb_cmp(struct dlm_rsb *r, const char *name, int nlen)
{
char maxname[DLM_RESNAME_MAXLEN];
memset(maxname, 0, DLM_RESNAME_MAXLEN);
memcpy(maxname, name, nlen);
return memcmp(r->res_name, maxname, DLM_RESNAME_MAXLEN);
}
static int search_rsb_tree(struct rb_root *tree, char *name, int len,
unsigned int flags, struct dlm_rsb **r_ret)
{
struct rb_node *node = tree->rb_node;
struct dlm_rsb *r;
int error = 0;
int rc;
list_for_each_entry(r, head, res_hashchain) {
if (len == r->res_length && !memcmp(name, r->res_name, len))
while (node) {
r = rb_entry(node, struct dlm_rsb, res_hashnode);
rc = rsb_cmp(r, name, len);
if (rc < 0)
node = node->rb_left;
else if (rc > 0)
node = node->rb_right;
else
goto found;
}
*r_ret = NULL;
@@ -420,22 +439,54 @@ static int search_rsb_list(struct list_head *head, char *name, int len,
return error;
}
static int rsb_insert(struct dlm_rsb *rsb, struct rb_root *tree)
{
struct rb_node **newn = &tree->rb_node;
struct rb_node *parent = NULL;
int rc;
while (*newn) {
struct dlm_rsb *cur = rb_entry(*newn, struct dlm_rsb,
res_hashnode);
parent = *newn;
rc = rsb_cmp(cur, rsb->res_name, rsb->res_length);
if (rc < 0)
newn = &parent->rb_left;
else if (rc > 0)
newn = &parent->rb_right;
else {
log_print("rsb_insert match");
dlm_dump_rsb(rsb);
dlm_dump_rsb(cur);
return -EEXIST;
}
}
rb_link_node(&rsb->res_hashnode, parent, newn);
rb_insert_color(&rsb->res_hashnode, tree);
return 0;
}
static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b,
unsigned int flags, struct dlm_rsb **r_ret)
{
struct dlm_rsb *r;
int error;
error = search_rsb_list(&ls->ls_rsbtbl[b].list, name, len, flags, &r);
error = search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, flags, &r);
if (!error) {
kref_get(&r->res_ref);
goto out;
}
error = search_rsb_list(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
error = search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
if (error)
goto out;
list_move(&r->res_hashchain, &ls->ls_rsbtbl[b].list);
rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
error = rsb_insert(r, &ls->ls_rsbtbl[b].keep);
if (error)
return error;
if (dlm_no_directory(ls))
goto out;
@@ -527,8 +578,7 @@ static int find_rsb(struct dlm_ls *ls, char *name, int namelen,
nodeid = 0;
r->res_nodeid = nodeid;
}
list_add(&r->res_hashchain, &ls->ls_rsbtbl[bucket].list);
error = 0;
error = rsb_insert(r, &ls->ls_rsbtbl[bucket].keep);
out_unlock:
spin_unlock(&ls->ls_rsbtbl[bucket].lock);
out:
@@ -556,7 +606,8 @@ static void toss_rsb(struct kref *kref)
DLM_ASSERT(list_empty(&r->res_root_list), dlm_print_rsb(r););
kref_init(&r->res_ref);
list_move(&r->res_hashchain, &ls->ls_rsbtbl[r->res_bucket].toss);
rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[r->res_bucket].keep);
rsb_insert(r, &ls->ls_rsbtbl[r->res_bucket].toss);
r->res_toss_time = jiffies;
if (r->res_lvbptr) {
dlm_free_lvb(r->res_lvbptr);
@@ -1082,19 +1133,19 @@ static void dir_remove(struct dlm_rsb *r)
r->res_name, r->res_length);
}
/* FIXME: shouldn't this be able to exit as soon as one non-due rsb is
found since they are in order of newest to oldest? */
/* FIXME: make this more efficient */
static int shrink_bucket(struct dlm_ls *ls, int b)
{
struct rb_node *n;
struct dlm_rsb *r;
int count = 0, found;
for (;;) {
found = 0;
spin_lock(&ls->ls_rsbtbl[b].lock);
list_for_each_entry_reverse(r, &ls->ls_rsbtbl[b].toss,
res_hashchain) {
for (n = rb_first(&ls->ls_rsbtbl[b].toss); n; n = rb_next(n)) {
r = rb_entry(n, struct dlm_rsb, res_hashnode);
if (!time_after_eq(jiffies, r->res_toss_time +
dlm_config.ci_toss_secs * HZ))
continue;
@@ -1108,7 +1159,7 @@ static int shrink_bucket(struct dlm_ls *ls, int b)
}
if (kref_put(&r->res_ref, kill_rsb)) {
list_del(&r->res_hashchain);
rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss);
spin_unlock(&ls->ls_rsbtbl[b].lock);
if (is_master(r))
@@ -4441,10 +4492,12 @@ int dlm_purge_locks(struct dlm_ls *ls)
static struct dlm_rsb *find_purged_rsb(struct dlm_ls *ls, int bucket)
{
struct rb_node *n;
struct dlm_rsb *r, *r_ret = NULL;
spin_lock(&ls->ls_rsbtbl[bucket].lock);
list_for_each_entry(r, &ls->ls_rsbtbl[bucket].list, res_hashchain) {
for (n = rb_first(&ls->ls_rsbtbl[bucket].keep); n; n = rb_next(n)) {
r = rb_entry(n, struct dlm_rsb, res_hashnode);
if (!rsb_flag(r, RSB_LOCKS_PURGED))
continue;
hold_rsb(r);