From a720011c8a05d610c737c4e7e299b03506ce810f Mon Sep 17 00:00:00 2001 From: Howard Chu Date: Sun, 31 Dec 2006 16:16:48 +0000 Subject: [PATCH] Ditch LRU cache replacement in favor of 2nd-chance/clock. Much better concurrency. --- servers/slapd/back-bdb/back-bdb.h | 8 +- servers/slapd/back-bdb/cache.c | 378 +++++++++++++++--------------- servers/slapd/back-bdb/init.c | 14 +- 3 files changed, 192 insertions(+), 208 deletions(-) diff --git a/servers/slapd/back-bdb/back-bdb.h b/servers/slapd/back-bdb/back-bdb.h index df8125be6c..ae25890a90 100644 --- a/servers/slapd/back-bdb/back-bdb.h +++ b/servers/slapd/back-bdb/back-bdb.h @@ -94,6 +94,7 @@ typedef struct bdb_entry_info { #define CACHE_ENTRY_LOADING 0x10 #define CACHE_ENTRY_WALKING 0x20 #define CACHE_ENTRY_ONELEVEL 0x40 +#define CACHE_ENTRY_REFERENCED 0x80 /* * remaining fields require backend cache lock to access @@ -121,8 +122,8 @@ typedef struct bdb_entry_info { /* for the in-core cache of entries */ typedef struct bdb_cache { - int c_maxsize; - int c_cursize; + int c_maxsize; + int c_cursize; int c_minfree; int c_eiused; /* EntryInfo's in use */ int c_leaves; /* EntryInfo leaf nodes */ @@ -134,7 +135,8 @@ typedef struct bdb_cache { ldap_pvt_thread_rdwr_t c_rwlock; ldap_pvt_thread_mutex_t lru_head_mutex; ldap_pvt_thread_mutex_t lru_tail_mutex; - u_int32_t c_locker; /* used by lru cleaner */ + ldap_pvt_thread_mutex_t c_count_mutex; + ldap_pvt_thread_mutex_t c_eifree_mutex; #ifdef SLAP_ZONE_ALLOC void *c_zctx; #endif diff --git a/servers/slapd/back-bdb/cache.c b/servers/slapd/back-bdb/cache.c index 7a652a6e7b..86acd1316f 100644 --- a/servers/slapd/back-bdb/cache.c +++ b/servers/slapd/back-bdb/cache.c @@ -29,9 +29,9 @@ #include "ldap_rq.h" #ifdef BDB_HIER -#define bdb_cache_lru_add hdb_cache_lru_add +#define bdb_cache_lru_purge hdb_cache_lru_purge #endif -static void bdb_cache_lru_add( struct bdb_info *bdb, EntryInfo *ei ); +static void bdb_cache_lru_purge( struct bdb_info *bdb ); static int bdb_cache_delete_internal(Cache *cache, EntryInfo *e, int decr); #ifdef LDAP_DEBUG @@ -40,30 +40,83 @@ static void bdb_lru_print(Cache *cache); #endif #endif +/* For concurrency experiments only! */ +#if 0 +#define ldap_pvt_thread_rdwr_wlock(a) 0 +#define ldap_pvt_thread_rdwr_wunlock(a) 0 +#define ldap_pvt_thread_rdwr_rlock(a) 0 +#define ldap_pvt_thread_rdwr_runlock(a) 0 +#endif + +#if 0 +#define ldap_pvt_thread_mutex_trylock(a) 0 +#endif + static EntryInfo * bdb_cache_entryinfo_new( Cache *cache ) { EntryInfo *ei = NULL; if ( cache->c_eifree ) { - ldap_pvt_thread_rdwr_wlock( &cache->c_rwlock ); + ldap_pvt_thread_mutex_lock( &cache->c_eifree_mutex ); if ( cache->c_eifree ) { ei = cache->c_eifree; cache->c_eifree = ei->bei_lrunext; } - ldap_pvt_thread_rdwr_wunlock( &cache->c_rwlock ); + ldap_pvt_thread_mutex_unlock( &cache->c_eifree_mutex ); } - if ( ei ) { - ei->bei_lrunext = NULL; - ei->bei_state = 0; - } else { - ei = ch_calloc(1, sizeof(struct bdb_entry_info)); + if ( !ei ) { + ei = ch_calloc(1, sizeof(EntryInfo)); ldap_pvt_thread_mutex_init( &ei->bei_kids_mutex ); } + ei->bei_state = CACHE_ENTRY_REFERENCED; + return ei; } +/* Note - we now use a Second-Chance / Clock algorithm instead of + * Least-Recently-Used. This tremendously improves concurrency + * because we no longer need to manipulate the lists every time an + * entry is touched. We only need to lock the lists when adding + * or deleting an entry. It's now a circular doubly-linked list. + * We always append to the tail, but the head traverses the circle + * during a purge operation. + */ +static void +bdb_cache_lru_link( Cache *cache, EntryInfo *ei ) +{ + /* Insert into circular LRU list */ + ldap_pvt_thread_mutex_lock( &cache->lru_tail_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; + if ( ei->bei_lrunext ) + ei->bei_lrunext->bei_lruprev = ei; + } else { + ei->bei_lrunext = ei->bei_lruprev = ei; + cache->c_lruhead = ei; + } + cache->c_lrutail = ei; + ldap_pvt_thread_mutex_unlock( &cache->lru_tail_mutex ); +} + +#ifdef NO_THREADS +#define NO_DB_LOCK +#endif + +/* #define NO_DB_LOCK 1 */ +/* Note: The BerkeleyDB locks are much slower than regular + * mutexes or rdwr locks. But the BDB implementation has the + * advantage of using a fixed size lock table, instead of + * allocating a lock object per entry in the DB. That's a + * key benefit for scaling. It also frees us from worrying + * about undetectable deadlocks between BDB activity and our + * own cache activity. It's still worth exploring faster + * alternatives though. + */ + /* Atomically release and reacquire a lock */ int bdb_cache_entry_db_relock( @@ -74,7 +127,7 @@ bdb_cache_entry_db_relock( int tryOnly, DB_LOCK *lock ) { -#ifdef NO_THREADS +#ifdef NO_DB_LOCK return 0; #else int rc; @@ -110,7 +163,7 @@ static int bdb_cache_entry_db_lock( DB_ENV *env, u_int32_t locker, EntryInfo *ei, int rw, int tryOnly, DB_LOCK *lock ) { -#ifdef NO_THREADS +#ifdef NO_DB_LOCK return 0; #else int rc; @@ -135,13 +188,13 @@ bdb_cache_entry_db_lock( DB_ENV *env, u_int32_t locker, EntryInfo *ei, ei->bei_id, rw, rc ); } return rc; -#endif /* NO_THREADS */ +#endif /* NO_DB_LOCK */ } int bdb_cache_entry_db_unlock ( DB_ENV *env, DB_LOCK *lock ) { -#ifdef NO_THREADS +#ifdef NO_DB_LOCK return 0; #else int rc; @@ -165,34 +218,6 @@ bdb_cache_entryinfo_destroy( EntryInfo *e ) return 0; } -#define LRU_DELETE( cache, ei ) do { \ - if ( (ei)->bei_lruprev != NULL ) { \ - (ei)->bei_lruprev->bei_lrunext = (ei)->bei_lrunext; \ - } else { \ - (cache)->c_lruhead = (ei)->bei_lrunext; \ - } \ - if ( (ei)->bei_lrunext != NULL ) { \ - (ei)->bei_lrunext->bei_lruprev = (ei)->bei_lruprev; \ - } else { \ - (cache)->c_lrutail = (ei)->bei_lruprev; \ - } \ - (ei)->bei_lrunext = (ei)->bei_lruprev = NULL; \ -} while(0) - -#define LRU_ADD( cache, ei ) do { \ - (ei)->bei_lrunext = (cache)->c_lruhead; \ - if ( (ei)->bei_lrunext != NULL ) { \ - (ei)->bei_lrunext->bei_lruprev = (ei); \ - } \ - (cache)->c_lruhead = (ei); \ - (ei)->bei_lruprev = NULL; \ - if ( !ldap_pvt_thread_mutex_trylock( &(cache)->lru_tail_mutex )) { \ - if ( (cache)->c_lrutail == NULL ) \ - (cache)->c_lrutail = (ei); \ - ldap_pvt_thread_mutex_unlock( &(cache)->lru_tail_mutex ); \ - } \ -} while(0) - /* Do a length-ordered sort on normalized RDNs */ static int bdb_rdn_cmp( const void *v_e1, const void *v_e2 ) @@ -267,6 +292,7 @@ bdb_entryinfo_add_internal( ei->bei_parent->bei_ckids++; #endif } + bdb_cache_lru_link( &bdb->bi_cache, ei2 ); *res = ei2; return 0; @@ -315,6 +341,7 @@ bdb_cache_find_ndn( } for ( bdb_cache_entryinfo_lock( eip ); eip; ) { + eip->bei_state |= CACHE_ENTRY_REFERENCED; ei.bei_parent = eip; ei2 = (EntryInfo *)avl_find( eip->bei_kids, &ei, bdb_rdn_cmp ); if ( !ei2 ) { @@ -392,7 +419,6 @@ hdb_cache_find_parent( struct bdb_info *bdb = (struct bdb_info *) op->o_bd->be_private; EntryInfo ei, eip, *ei2 = NULL, *ein = NULL, *eir = NULL; int rc; - int addlru = 0; ei.bei_id = id; ei.bei_kids = NULL; @@ -418,7 +444,7 @@ hdb_cache_find_parent( ei.bei_ckids = 0; /* This node is not fully connected yet */ - ein->bei_state = CACHE_ENTRY_NOT_LINKED; + ein->bei_state |= CACHE_ENTRY_NOT_LINKED; /* Insert this node into the ID tree */ ldap_pvt_thread_rdwr_wlock( &bdb->bi_cache.c_rwlock ); @@ -440,8 +466,8 @@ hdb_cache_find_parent( ein->bei_ckids++; bdb_cache_entryinfo_unlock( ein ); } - addlru = 0; - + } else { + bdb_cache_lru_link( &bdb->bi_cache, ein ); } /* If this is the first time, save this node @@ -464,25 +490,21 @@ hdb_cache_find_parent( bdb->bi_cache.c_leaves++; ldap_pvt_thread_rdwr_wunlock( &bdb->bi_cache.c_rwlock ); - if ( addlru ) { - ldap_pvt_thread_mutex_lock( &bdb->bi_cache.lru_head_mutex ); - bdb_cache_lru_add( bdb, ein ); - } - addlru = 1; - /* Got the parent, link in and we're done. */ if ( ei2 ) { bdb_cache_entryinfo_lock( ei2 ); ein->bei_parent = ei2; + + /* Reset all the state info */ + for (ein = eir; ein != ei2; ein=ein->bei_parent) + ein->bei_state &= ~CACHE_ENTRY_NOT_LINKED; + avl_insert( &ei2->bei_kids, (caddr_t)ein, bdb_rdn_cmp, avl_dup_error); ei2->bei_ckids++; bdb_cache_entryinfo_unlock( ei2 ); bdb_cache_entryinfo_lock( eir ); - /* Reset all the state info */ - for (ein = eir; ein != ei2; ein=ein->bei_parent) - ein->bei_state &= ~CACHE_ENTRY_NOT_LINKED; *res = eir; break; } @@ -531,94 +553,87 @@ int hdb_cache_load( } #endif -/* caller must have lru_head_mutex locked. mutex - * will be unlocked on return. - */ static void -bdb_cache_lru_add( - struct bdb_info *bdb, - EntryInfo *ei ) +bdb_cache_lru_purge( struct bdb_info *bdb ) { - DB_LOCK lock, *lockp; - EntryInfo *elru, *elprev; - int count = 0; - - LRU_ADD( &bdb->bi_cache, ei ); - ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.lru_head_mutex ); + EntryInfo *elru, *elnext; + int count, islocked; - /* See if we're above the cache size limit */ - if ( bdb->bi_cache.c_cursize <= bdb->bi_cache.c_maxsize ) + /* Don't bother if we can't get the lock */ + if ( ldap_pvt_thread_mutex_trylock( &bdb->bi_cache.lru_head_mutex ) ) return; - if ( bdb->bi_cache.c_locker ) { - lockp = &lock; - } else { - lockp = NULL; - } - - /* Don't bother if we can't get the lock */ - if ( ldap_pvt_thread_mutex_trylock( &bdb->bi_cache.lru_tail_mutex ) ) + if ( bdb->bi_cache.c_cursize <= bdb->bi_cache.c_maxsize ) { + ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.lru_head_mutex ); return; + } + count = 0; /* Look for an unused entry to remove */ - for (elru = bdb->bi_cache.c_lrutail; elru; elru = elprev ) { - elprev = elru->bei_lruprev; + for (elru = bdb->bi_cache.c_lruhead; elru; elru = elnext ) { + elnext = elru->bei_lrunext; + + if ( ldap_pvt_thread_mutex_trylock( &elru->bei_kids_mutex )) + continue; - /* If we can successfully writelock it, then - * the object is idle. + /* This flag implements the clock replacement behavior */ + if ( elru->bei_state & ( CACHE_ENTRY_REFERENCED )) { + elru->bei_state &= ~CACHE_ENTRY_REFERENCED; + bdb_cache_entryinfo_unlock( elru ); + continue; + } + + /* If this node is in the process of linking into the cache, + * or this node is being deleted, skip it. */ - if ( bdb_cache_entry_db_lock( bdb->bi_dbenv, - bdb->bi_cache.c_locker, elru, 1, 1, lockp ) == 0 ) { + if ( elru->bei_state & ( CACHE_ENTRY_NOT_LINKED | + CACHE_ENTRY_DELETED | CACHE_ENTRY_LOADING )) { + bdb_cache_entryinfo_unlock( elru ); + continue; + } + islocked = 1; - /* If this node is in the process of linking into the cache, - * or this node is being deleted, skip it. - */ - if ( elru->bei_state & - ( CACHE_ENTRY_NOT_LINKED | CACHE_ENTRY_DELETED )) { - bdb_cache_entry_db_unlock( bdb->bi_dbenv, lockp ); - continue; - } - /* Free entry for this node if it's present */ - if ( elru->bei_e ) { - elru->bei_e->e_private = NULL; + /* Free entry for this node if it's present */ + if ( elru->bei_e ) { + elru->bei_e->e_private = NULL; #ifdef SLAP_ZONE_ALLOC - bdb_entry_return( bdb, elru->bei_e, elru->bei_zseq ); + bdb_entry_return( bdb, elru->bei_e, elru->bei_zseq ); #else - bdb_entry_return( elru->bei_e ); + bdb_entry_return( elru->bei_e ); #endif - elru->bei_e = NULL; - count++; - } - /* ITS#4010 if we're in slapcat, and this node is a leaf - * node, free it. - * - * FIXME: we need to do this for slapd as well, (which is - * why we compute bi_cache.c_leaves now) but at the moment - * we can't because it causes unresolvable deadlocks. - */ - if ( slapMode & SLAP_TOOL_READONLY ) { - if ( !elru->bei_kids ) { - /* This does LRU_DELETE for us */ - bdb_cache_delete_internal( &bdb->bi_cache, elru, 0 ); - bdb_cache_delete_cleanup( &bdb->bi_cache, elru ); - } - /* Leave node on LRU list for a future pass */ - } else { - LRU_DELETE( &bdb->bi_cache, elru ); + elru->bei_e = NULL; + count++; + } + /* ITS#4010 if we're in slapcat, and this node is a leaf + * node, free it. + * + * FIXME: we need to do this for slapd as well, (which is + * why we compute bi_cache.c_leaves now) but at the moment + * we can't because it causes unresolvable deadlocks. + */ + if ( slapMode & SLAP_TOOL_READONLY ) { + if ( !elru->bei_kids ) { + bdb_cache_delete_internal( &bdb->bi_cache, elru, 0 ); + bdb_cache_delete_cleanup( &bdb->bi_cache, elru ); + islocked = 0; } - bdb_cache_entry_db_unlock( bdb->bi_dbenv, lockp ); + /* Leave node on LRU list for a future pass */ + } - if ( count >= bdb->bi_cache.c_minfree ) { - ldap_pvt_thread_rdwr_wlock( &bdb->bi_cache.c_rwlock ); - bdb->bi_cache.c_cursize -= count; - ldap_pvt_thread_rdwr_wunlock( &bdb->bi_cache.c_rwlock ); - break; - } + if ( islocked ) + bdb_cache_entryinfo_unlock( elru ); + + if ( count >= bdb->bi_cache.c_minfree ) { + ldap_pvt_thread_mutex_lock( &bdb->bi_cache.c_count_mutex ); + bdb->bi_cache.c_cursize -= count; + ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_count_mutex ); + break; } } - ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.lru_tail_mutex ); + bdb->bi_cache.c_lruhead = elru; + ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.lru_head_mutex ); } EntryInfo * @@ -822,31 +837,17 @@ load1: #endif } if ( rc == 0 ) { + int purge = 0; if ( load ) { - ldap_pvt_thread_rdwr_wlock( &bdb->bi_cache.c_rwlock ); + ldap_pvt_thread_mutex_lock( &bdb->bi_cache.c_count_mutex ); bdb->bi_cache.c_cursize++; - ldap_pvt_thread_rdwr_wunlock( &bdb->bi_cache.c_rwlock ); - } - - ldap_pvt_thread_mutex_lock( &bdb->bi_cache.lru_head_mutex ); - - /* If the LRU list has only one entry and this is it, it - * doesn't need to be added again. - */ - if ( bdb->bi_cache.c_lruhead == bdb->bi_cache.c_lrutail && - bdb->bi_cache.c_lruhead == *eip ) { - ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.lru_head_mutex ); - } else { - /* if entry is on LRU list, remove from old spot */ - if ( (*eip)->bei_lrunext || (*eip)->bei_lruprev ) { - ldap_pvt_thread_mutex_lock( &bdb->bi_cache.lru_tail_mutex ); - LRU_DELETE( &bdb->bi_cache, *eip ); - ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.lru_tail_mutex ); - } - /* lru_head_mutex is unlocked for us */ - bdb_cache_lru_add( bdb, *eip ); + if ( bdb->bi_cache.c_cursize > bdb->bi_cache.c_maxsize ) + purge = 1; + ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_count_mutex ); } + if ( purge ) + bdb_cache_lru_purge( bdb ); } #ifdef SLAP_ZONE_ALLOC @@ -890,7 +891,7 @@ bdb_cache_add( DB_LOCK *lock ) { EntryInfo *new, ei; - int rc; + int rc, purge = 0; #ifdef BDB_HIER struct berval rdn = e->e_name; #endif @@ -931,21 +932,22 @@ bdb_cache_add( } new->bei_e = e; e->e_private = new; - new->bei_state = CACHE_ENTRY_NO_KIDS | CACHE_ENTRY_NO_GRANDKIDS; + new->bei_state |= CACHE_ENTRY_NO_KIDS | CACHE_ENTRY_NO_GRANDKIDS; eip->bei_state &= ~CACHE_ENTRY_NO_KIDS; if (eip->bei_parent) { eip->bei_parent->bei_state &= ~CACHE_ENTRY_NO_GRANDKIDS; } bdb_cache_entryinfo_unlock( eip ); - ++bdb->bi_cache.c_cursize; 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 ) + purge = 1; + ldap_pvt_thread_mutex_unlock( &bdb->bi_cache.c_count_mutex ); - /* set lru mutex */ - ldap_pvt_thread_mutex_lock( &bdb->bi_cache.lru_head_mutex ); - - /* lru_head_mutex is unlocked for us */ - bdb_cache_lru_add( bdb, new ); + if ( purge ) + bdb_cache_lru_purge( bdb ); return rc; } @@ -1108,18 +1110,12 @@ bdb_cache_delete( e->e_id, 0, 0 ); /* set lru mutex */ - ldap_pvt_thread_mutex_lock( &cache->lru_tail_mutex ); - - /* set cache write lock */ - ldap_pvt_thread_rdwr_wlock( &cache->c_rwlock ); + ldap_pvt_thread_mutex_lock( &cache->lru_head_mutex ); rc = bdb_cache_delete_internal( cache, e->e_private, 1 ); - /* free cache write lock */ - ldap_pvt_thread_rdwr_wunlock( &cache->c_rwlock ); - /* free lru mutex */ - ldap_pvt_thread_mutex_unlock( &cache->lru_tail_mutex ); + ldap_pvt_thread_mutex_unlock( &cache->lru_head_mutex ); /* Leave entry info locked */ @@ -1154,10 +1150,10 @@ bdb_cache_delete_cleanup( ei->bei_kids = NULL; ei->bei_lruprev = NULL; - ldap_pvt_thread_rdwr_wlock( &cache->c_rwlock ); + ldap_pvt_thread_mutex_lock( &cache->c_eifree_mutex ); ei->bei_lrunext = cache->c_eifree; cache->c_eifree = ei; - ldap_pvt_thread_rdwr_wunlock( &cache->c_rwlock ); + ldap_pvt_thread_mutex_unlock( &cache->c_eifree_mutex ); bdb_cache_entryinfo_unlock( ei ); } @@ -1168,6 +1164,7 @@ bdb_cache_delete_internal( int decr ) { int rc = 0; /* return code */ + int decr_leaf = 0; /* Lock the parent's kids tree */ bdb_cache_entryinfo_lock( e->bei_parent ); @@ -1183,22 +1180,39 @@ bdb_cache_delete_internal( rc = -1; } if ( e->bei_parent->bei_kids ) - cache->c_leaves--; + decr_leaf = 1; + + bdb_cache_entryinfo_unlock( e->bei_parent ); + ldap_pvt_thread_rdwr_wlock( &cache->c_rwlock ); /* id tree */ - if ( avl_delete( &cache->c_idtree, (caddr_t) e, bdb_id_cmp ) == NULL ) { + if ( avl_delete( &cache->c_idtree, (caddr_t) e, bdb_id_cmp )) { + cache->c_eiused--; + if ( decr_leaf ) + cache->c_leaves--; + } else { rc = -1; } + ldap_pvt_thread_rdwr_wunlock( &cache->c_rwlock ); if ( rc == 0 ){ - cache->c_eiused--; - /* lru */ - LRU_DELETE( cache, e ); - if ( e->bei_e ) cache->c_cursize--; - } + if ( e == cache->c_lruhead ) cache->c_lruhead = e->bei_lrunext; + if ( e == cache->c_lrutail ) { + ldap_pvt_thread_mutex_lock( &cache->lru_tail_mutex ); + if ( e == cache->c_lrutail ) cache->c_lrutail = e->bei_lruprev; + ldap_pvt_thread_mutex_unlock( &cache->lru_tail_mutex ); + } - bdb_cache_entryinfo_unlock( e->bei_parent ); + if ( e->bei_lrunext ) e->bei_lrunext->bei_lruprev = e->bei_lruprev; + if ( e->bei_lruprev ) e->bei_lruprev->bei_lrunext = e->bei_lrunext; + + if ( e->bei_e ) { + ldap_pvt_thread_mutex_lock( &cache->c_count_mutex ); + cache->c_cursize--; + ldap_pvt_thread_mutex_unlock( &cache->c_count_mutex ); + } + } return( rc ); } @@ -1341,29 +1355,3 @@ bdb_locker_id( Operation *op, DB_ENV *env, u_int32_t *locker ) return 0; } #endif /* BDB_REUSE_LOCKERS */ - -void -bdb_cache_delete_entry( - struct bdb_info *bdb, - EntryInfo *ei, - u_int32_t locker, - DB_LOCK *lock ) -{ - ldap_pvt_thread_rdwr_wlock( &bdb->bi_cache.c_rwlock ); - if ( bdb_cache_entry_db_lock( bdb->bi_dbenv, bdb->bi_cache.c_locker, ei, 1, 1, lock ) == 0 ) - { - if ( ei->bei_e && !(ei->bei_state & CACHE_ENTRY_NOT_LINKED )) { - LRU_DELETE( &bdb->bi_cache, ei ); - ei->bei_e->e_private = NULL; -#ifdef SLAP_ZONE_ALLOC - bdb_entry_return( bdb, ei->bei_e, ei->bei_zseq ); -#else - bdb_entry_return( ei->bei_e ); -#endif - ei->bei_e = NULL; - --bdb->bi_cache.c_cursize; - } - bdb_cache_entry_db_unlock( bdb->bi_dbenv, lock ); - } - ldap_pvt_thread_rdwr_wunlock( &bdb->bi_cache.c_rwlock ); -} diff --git a/servers/slapd/back-bdb/init.c b/servers/slapd/back-bdb/init.c index c01a5136e8..194c833cff 100644 --- a/servers/slapd/back-bdb/init.c +++ b/servers/slapd/back-bdb/init.c @@ -73,6 +73,8 @@ bdb_db_init( BackendDB *be ) #endif ldap_pvt_thread_mutex_init( &bdb->bi_cache.lru_head_mutex ); ldap_pvt_thread_mutex_init( &bdb->bi_cache.lru_tail_mutex ); + ldap_pvt_thread_mutex_init( &bdb->bi_cache.c_count_mutex ); + ldap_pvt_thread_mutex_init( &bdb->bi_cache.c_eifree_mutex ); ldap_pvt_thread_mutex_init( &bdb->bi_cache.c_dntree.bei_kids_mutex ); ldap_pvt_thread_rdwr_init ( &bdb->bi_cache.c_rwlock ); ldap_pvt_thread_rdwr_init( &bdb->bi_idl_tree_rwlock ); @@ -421,10 +423,6 @@ bdb_db_open( BackendDB *be ) goto fail; } - if ( !quick ) { - XLOCK_ID(bdb->bi_dbenv, &bdb->bi_cache.c_locker); - } - /* monitor setup */ rc = bdb_monitor_db_open( be ); if ( rc != 0 ) { @@ -488,12 +486,6 @@ bdb_db_close( BackendDB *be ) /* close db environment */ if( bdb->bi_dbenv ) { - /* Free cache locker if we enabled locking */ - if ( !( slapMode & SLAP_TOOL_QUICK )) { - XLOCK_ID_FREE(bdb->bi_dbenv, bdb->bi_cache.c_locker); - bdb->bi_cache.c_locker = 0; - } - /* force a checkpoint, but not if we were ReadOnly, * and not in Quick mode since there are no transactions there. */ @@ -542,6 +534,8 @@ bdb_db_destroy( BackendDB *be ) ldap_pvt_thread_rdwr_destroy ( &bdb->bi_cache.c_rwlock ); ldap_pvt_thread_mutex_destroy( &bdb->bi_cache.lru_head_mutex ); ldap_pvt_thread_mutex_destroy( &bdb->bi_cache.lru_tail_mutex ); + ldap_pvt_thread_mutex_destroy( &bdb->bi_cache.c_count_mutex ); + ldap_pvt_thread_mutex_destroy( &bdb->bi_cache.c_eifree_mutex ); ldap_pvt_thread_mutex_destroy( &bdb->bi_cache.c_dntree.bei_kids_mutex ); #ifdef BDB_HIER ldap_pvt_thread_mutex_destroy( &bdb->bi_modrdns_mutex ); -- 2.39.5