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Make the Pager.pAll linked-list doubly linked when ENABLE_MEMORY_MANAGEMENT is defined. This is used to speed up sqlite3_release_memory(). (CVS 5346)

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FossilOrigin-Name: 71d699de366fc9c97d4a5122e2bf754310b9b34a
This commit is contained in:
danielk1977
2008-07-07 11:18:27 +00:00
parent 8c4d5b252e
commit 21b7ce6151
3 changed files with 27 additions and 11 deletions
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22
src/pager.c
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@@ -18,7 +18,7 @@
** file simultaneously, or one process from reading the database while
** another is writing.
**
** @(#) $Id: pager.c,v 1.460 2008/06/20 14:59:51 danielk1977 Exp $
** @(#) $Id: pager.c,v 1.461 2008/07/07 11:18:28 danielk1977 Exp $
*/
#ifndef SQLITE_OMIT_DISKIO
#include "sqliteInt.h"
@@ -269,6 +269,7 @@ struct PgHdr {
short int nRef; /* Number of users of this page */
PgHdr *pDirty, *pPrevDirty; /* Dirty pages */
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
PgHdr *pPrevAll; /* A list of all pages */
PagerLruLink gfree; /* Global list of nRef==0 pages */
#endif
#ifdef SQLITE_CHECK_PAGES
@@ -3336,10 +3337,20 @@ int sqlite3PagerReleaseMemory(int nReq){
PgHdr *pTmp;
assert( pPg );
if( pPg==pPager->pAll ){
assert(pPg->pPrevAll==0);
assert(pPg->pNextAll==0 || pPg->pNextAll->pPrevAll==pPg);
pPager->pAll = pPg->pNextAll;
if( pPager->pAll ){
pPager->pAll->pPrevAll = 0;
}
}else{
for( pTmp=pPager->pAll; pTmp->pNextAll!=pPg; pTmp=pTmp->pNextAll ){}
pTmp->pNextAll = pPg->pNextAll;
assert(pPg->pPrevAll);
assert(pPg->pPrevAll->pNextAll==pPg);
pTmp = pPg->pPrevAll;
pTmp->pNextAll = pPg->pNextAll;
if( pTmp->pNextAll ){
pTmp->pNextAll->pPrevAll = pTmp;
}
}
nReleased += (
sizeof(*pPg) + pPager->pageSize
@@ -3665,6 +3676,11 @@ static int pagerAllocatePage(Pager *pPager, PgHdr **ppPg){
pPg->pData = pData;
pPg->pPager = pPager;
pPg->pNextAll = pPager->pAll;
#ifdef SQLITE_ENABLE_MEMORY_MANAGEMENT
if( pPg->pNextAll ){
pPg->pNextAll->pPrevAll = pPg;
}
#endif
pPager->pAll = pPg;
pPager->nPage++;
}else{