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linux-2.6
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dlm: fix slow rsb search in dir recovery 

The function used to find an rsb during directory
recovery was searching the single linear list of
rsb's.  This wasted a lot of time compared to
using the standard hash table to find the rsb.

Signed-off-by: David Teigland <teigland@redhat.com>
This commit is contained in:
David Teigland 2012-03-08 12:37:12 -06:00
parent 192cfd5877
commit 7210cb7a72
3 changed files with 24 additions and 4 deletions
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17
fs/dlm/dir.c
View File

@ -351,11 +351,28 @@ int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen,
static struct dlm_rsb *find_rsb_root(struct dlm_ls *ls, char *name, int len)
{
struct dlm_rsb *r;
uint32_t hash, bucket;
int rv;
hash = jhash(name, len, 0);
bucket = hash & (ls->ls_rsbtbl_size - 1);
spin_lock(&ls->ls_rsbtbl[bucket].lock);
rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[bucket].keep, name, len, 0, &r);
if (rv)
rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[bucket].toss,
name, len, 0, &r);
spin_unlock(&ls->ls_rsbtbl[bucket].lock);
if (!rv)
return r;
down_read(&ls->ls_root_sem);
list_for_each_entry(r, &ls->ls_root_list, res_root_list) {
if (len == r->res_length && !memcmp(name, r->res_name, len)) {
up_read(&ls->ls_root_sem);
log_error(ls, "find_rsb_root revert to root_list %s",
r->res_name);
return r;
}
}

8
fs/dlm/lock.c
View File

@ -411,8 +411,8 @@ static int rsb_cmp(struct dlm_rsb *r, const char *name, int 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)
int dlm_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;
@ -474,12 +474,12 @@ static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b,
struct dlm_rsb *r;
int error;
error = search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, flags, &r);
error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, flags, &r);
if (!error) {
kref_get(&r->res_ref);
goto out;
}
error = search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, flags, &r);
if (error)
goto out;

3
fs/dlm/lock.h
View File

@ -28,6 +28,9 @@ void dlm_scan_waiters(struct dlm_ls *ls);
void dlm_scan_timeout(struct dlm_ls *ls);
void dlm_adjust_timeouts(struct dlm_ls *ls);
int dlm_search_rsb_tree(struct rb_root *tree, char *name, int len,
unsigned int flags, struct dlm_rsb **r_ret);
int dlm_purge_locks(struct dlm_ls *ls);
void dlm_purge_mstcpy_locks(struct dlm_rsb *r);
void dlm_grant_after_purge(struct dlm_ls *ls);