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Optimization: When loading a new page into the cache, avoid redundant memset() calls to zero it. (CVS 6201)

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FossilOrigin-Name: 9c0b9f881367871105965d4268e2f2cde7f4d884
This commit is contained in:
danielk1977
2009-01-23 16:45:00 +00:00
parent 663d56d46f
commit e1fd508a28
7 changed files with 42 additions and 33 deletions
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17
src/pcache.c
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@@ -11,7 +11,7 @@
*************************************************************************
** This file implements that page cache.
**
** @(#) $Id: pcache.c,v 1.42 2009/01/20 17:06:27 danielk1977 Exp $
** @(#) $Id: pcache.c,v 1.43 2009/01/23 16:45:01 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -261,14 +261,21 @@ int sqlite3PcacheFetch(
}
if( pPage ){
if( !pPage->pData ){
memset(pPage, 0, sizeof(PgHdr) + pCache->szExtra);
pPage->pExtra = (void*)&pPage[1];
pPage->pData = (void *)&((char *)pPage)[sizeof(PgHdr) + pCache->szExtra];
pPage->pCache = pCache;
pPage->pgno = pgno;
}
assert( pPage->pCache==pCache );
assert( pPage->pgno==pgno );
assert( pPage->pExtra==(void *)&pPage[1] );
if( 0==pPage->nRef ){
pCache->nRef++;
}
pPage->nRef++;
pPage->pData = (void*)&pPage[1];
pPage->pExtra = (void*)&((char*)pPage->pData)[pCache->szPage];
pPage->pCache = pCache;
pPage->pgno = pgno;
if( pgno==1 ){
pCache->pPage1 = pPage;
}