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Avoid calling purge too often

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This commit is contained in:
Howard Chu 2007-01-05 06:49:25 +00:00
parent c56564e2b5
commit 2082b1f9f0
2 changed files with 34 additions and 20 deletions
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1
servers/slapd/back-bdb/back-bdb.h
View File

@ -133,6 +133,7 @@ typedef struct bdb_cache {
int c_minfree;
int c_eiused; /* EntryInfo's in use */
int c_leaves; /* EntryInfo leaf nodes */
int c_purging;
u_int32_t c_locker; /* used by lru cleaner */
ldap_pvt_thread_rdwr_t c_rwlock;
ldap_pvt_thread_mutex_t c_lru_mutex;

53
servers/slapd/back-bdb/cache.c
View File

@ -85,22 +85,22 @@ bdb_cache_entryinfo_new( Cache *cache )
* during a purge operation.
*/
static void
bdb_cache_lru_link( Cache *cache, EntryInfo *ei )
bdb_cache_lru_link( struct bdb_info *bdb, EntryInfo *ei )
{
/* Insert into circular LRU list */
ldap_pvt_thread_mutex_lock( &cache->c_lru_mutex );
ei->bei_lruprev = cache->c_lrutail;
if ( cache->c_lrutail ) {
ei->bei_lrunext = cache->c_lrutail->bei_lrunext;
cache->c_lrutail->bei_lrunext = ei;
ldap_pvt_thread_mutex_lock( &bdb->bi_cache.c_lru_mutex );
ei->bei_lruprev = bdb->bi_cache.c_lrutail;
if ( bdb->bi_cache.c_lrutail ) {
ei->bei_lrunext = bdb->bi_cache.c_lrutail->bei_lrunext;
bdb->bi_cache.c_lrutail->bei_lrunext = ei;
if ( ei->bei_lrunext )
ei->bei_lrunext->bei_lruprev = ei;
} else {
ei->bei_lrunext = ei->bei_lruprev = ei;
cache->c_lruhead = ei;
bdb->bi_cache.c_lruhead = ei;
}
cache->c_lrutail = ei;
ldap_pvt_thread_mutex_unlock( &cache->c_lru_mutex );
bdb->bi_cache.c_lrutail = ei;
ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_lru_mutex );
}
#ifdef NO_THREADS
@ -293,7 +293,6 @@ bdb_entryinfo_add_internal(
ei->bei_parent->bei_ckids++;
#endif
}
bdb_cache_lru_link( &bdb->bi_cache, ei2 );
*res = ei2;
return 0;
@ -467,8 +466,6 @@ hdb_cache_find_parent(
ein->bei_ckids++;
bdb_cache_entryinfo_unlock( ein );
}
} else {
bdb_cache_lru_link( &bdb->bi_cache, ein );
}
/* If this is the first time, save this node
@ -555,6 +552,13 @@ int hdb_cache_load(
}
#endif
#define LRU_DEL( c, e ) do { \
if ( e == (c)->c_lruhead ) (c)->c_lruhead = e->bei_lrunext; \
if ( e == (c)->c_lrutail ) (c)->c_lrutail = e->bei_lruprev; \
e->bei_lrunext->bei_lruprev = e->bei_lruprev; \
e->bei_lruprev->bei_lrunext = e->bei_lrunext; \
} while ( 0 )
static void
bdb_cache_lru_purge( struct bdb_info *bdb )
{
@ -563,11 +567,14 @@ bdb_cache_lru_purge( struct bdb_info *bdb )
int i, count, islocked, tests;
/* Don't bother if we can't get the lock */
if ( ldap_pvt_thread_mutex_trylock( &bdb->bi_cache.c_lru_mutex ) )
if ( ldap_pvt_thread_mutex_trylock( &bdb->bi_cache.c_lru_mutex ) ) {
bdb->bi_cache.c_purging = 0;
return;
}
if ( bdb->bi_cache.c_cursize <= bdb->bi_cache.c_maxsize ) {
ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_lru_mutex );
bdb->bi_cache.c_purging = 0;
return;
}
@ -646,6 +653,8 @@ bdb_cache_lru_purge( struct bdb_info *bdb )
islocked = 0;
}
/* Leave node on LRU list for a future pass */
} else {
LRU_DEL( &bdb->bi_cache, elru );
}
}
@ -662,6 +671,7 @@ bdb_cache_lru_purge( struct bdb_info *bdb )
bdb->bi_cache.c_lruhead = elnext;
ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_lru_mutex );
bdb->bi_cache.c_purging = 0;
}
EntryInfo *
@ -808,6 +818,7 @@ load1:
(*eip)->bei_zseq = *((ber_len_t *)ep - 2);
#endif
ep = NULL;
bdb_cache_lru_link( bdb, *eip );
}
if ( rc == 0 ) {
/* If we succeeded, downgrade back to a readlock. */
@ -866,8 +877,11 @@ load1:
if ( load ) {
ldap_pvt_thread_mutex_lock( &bdb->bi_cache.c_count_mutex );
bdb->bi_cache.c_cursize++;
if ( bdb->bi_cache.c_cursize > bdb->bi_cache.c_maxsize )
if ( bdb->bi_cache.c_cursize > bdb->bi_cache.c_maxsize &&
!bdb->bi_cache.c_purging ) {
purge = 1;
bdb->bi_cache.c_purging = 1;
}
ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_count_mutex );
}
if ( purge )
@ -966,8 +980,11 @@ bdb_cache_add(
ldap_pvt_thread_rdwr_wunlock( &bdb->bi_cache.c_rwlock );
ldap_pvt_thread_mutex_lock( &bdb->bi_cache.c_count_mutex );
++bdb->bi_cache.c_cursize;
if ( bdb->bi_cache.c_cursize > bdb->bi_cache.c_maxsize )
if ( bdb->bi_cache.c_cursize > bdb->bi_cache.c_maxsize &&
!bdb->bi_cache.c_purging ) {
purge = 1;
bdb->bi_cache.c_purging = 1;
}
ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_count_mutex );
if ( purge )
@ -1220,11 +1237,7 @@ bdb_cache_delete_internal(
if ( rc == 0 ){
/* lru */
if ( e == cache->c_lruhead ) cache->c_lruhead = e->bei_lrunext;
if ( e == cache->c_lrutail ) cache->c_lrutail = e->bei_lruprev;
if ( e->bei_lrunext ) e->bei_lrunext->bei_lruprev = e->bei_lruprev;
if ( e->bei_lruprev ) e->bei_lruprev->bei_lrunext = e->bei_lrunext;
LRU_DEL( cache, e );
if ( e->bei_e ) {
ldap_pvt_thread_mutex_lock( &cache->c_count_mutex );