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Fix some latent bugs in dllist.c (carelessness about setting

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all fields that should be set).  Add a MoveToFront primitive to speed up
one of the hotspots in SearchSysCache.
This commit is contained in:
Tom Lane
1999-05-31 23:48:04 +00:00
parent 2a44383a2d
commit 185b427284
3 changed files with 73 additions and 40 deletions
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14
src/backend/utils/cache/catcache.c vendored
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@ -7,7 +7,7 @@
*
*
* IDENTIFICATION
* $Header: /cvsroot/pgsql/src/backend/utils/cache/catcache.c,v 1.41 1999/05/25 16:12:22 momjian Exp $
* $Header: /cvsroot/pgsql/src/backend/utils/cache/catcache.c,v 1.42 1999/05/31 23:48:04 tgl Exp $
*
* Notes:
* XXX This needs to use exception.h to handle recovery when
@ -876,16 +876,18 @@ SearchSysCache(struct catcache * cache,
/* ----------------
* if we found a tuple in the cache, move it to the top of the
* lru list, and return it.
* lru list, and return it. We also move it to the front of the
* list for its hashbucket, in order to speed subsequent searches.
* (The most frequently accessed elements in any hashbucket will
* tend to be near the front of the hashbucket's list.)
* ----------------
*/
if (elt)
{
Dlelem *old_lru_elt;
Dlelem *old_lru_elt = ((CatCTup *) DLE_VAL(elt))->ct_node;
old_lru_elt = ((CatCTup *) DLE_VAL(elt))->ct_node;
DLRemove(old_lru_elt);
DLAddHead(cache->cc_lrulist, old_lru_elt);
DLMoveToFront(old_lru_elt);
DLMoveToFront(elt);
#ifdef CACHEDEBUG
relation = heap_open(cache->relationId);