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Experimental change to the pcache interface to allow page buffers to be allocated separately from their associated container structures.

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FossilOrigin-Name: c275c9d323cb1dccb031b199d413ac3a0b244fea
This commit is contained in:
dan
2011-11-08 20:08:44 +00:00
parent 5802464316
commit 22e21ff4fc
12 changed files with 201 additions and 133 deletions
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76
src/pcache.c
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@@ -131,7 +131,7 @@ static void pcacheUnpin(PgHdr *p){
if( p->pgno==1 ){
pCache->pPage1 = 0;
}
sqlite3GlobalConfig.pcache.xUnpin(pCache->pCache, p, 0);
sqlite3GlobalConfig.pcache2.xUnpin(pCache->pCache, p->pPage, 0);
}
}
@@ -141,18 +141,18 @@ static void pcacheUnpin(PgHdr *p){
** functions are threadsafe.
*/
int sqlite3PcacheInitialize(void){
if( sqlite3GlobalConfig.pcache.xInit==0 ){
if( sqlite3GlobalConfig.pcache2.xInit==0 ){
/* IMPLEMENTATION-OF: R-26801-64137 If the xInit() method is NULL, then the
** built-in default page cache is used instead of the application defined
** page cache. */
sqlite3PCacheSetDefault();
}
return sqlite3GlobalConfig.pcache.xInit(sqlite3GlobalConfig.pcache.pArg);
return sqlite3GlobalConfig.pcache2.xInit(sqlite3GlobalConfig.pcache2.pArg);
}
void sqlite3PcacheShutdown(void){
if( sqlite3GlobalConfig.pcache.xShutdown ){
if( sqlite3GlobalConfig.pcache2.xShutdown ){
/* IMPLEMENTATION-OF: R-26000-56589 The xShutdown() method may be NULL. */
sqlite3GlobalConfig.pcache.xShutdown(sqlite3GlobalConfig.pcache.pArg);
sqlite3GlobalConfig.pcache2.xShutdown(sqlite3GlobalConfig.pcache2.pArg);
}
}
@@ -191,7 +191,7 @@ void sqlite3PcacheOpen(
void sqlite3PcacheSetPageSize(PCache *pCache, int szPage){
assert( pCache->nRef==0 && pCache->pDirty==0 );
if( pCache->pCache ){
sqlite3GlobalConfig.pcache.xDestroy(pCache->pCache);
sqlite3GlobalConfig.pcache2.xDestroy(pCache->pCache);
pCache->pCache = 0;
pCache->pPage1 = 0;
}
@@ -207,7 +207,8 @@ int sqlite3PcacheFetch(
int createFlag, /* If true, create page if it does not exist already */
PgHdr **ppPage /* Write the page here */
){
PgHdr *pPage = 0;
sqlite3_pcache_page *pPage = 0;
PgHdr *pPgHdr = 0;
int eCreate;
assert( pCache!=0 );
@@ -219,19 +220,19 @@ int sqlite3PcacheFetch(
*/
if( !pCache->pCache && createFlag ){
sqlite3_pcache *p;
int nByte;
nByte = pCache->szPage + pCache->szExtra + sizeof(PgHdr);
p = sqlite3GlobalConfig.pcache.xCreate(nByte, pCache->bPurgeable);
p = sqlite3GlobalConfig.pcache2.xCreate(
pCache->szExtra + sizeof(PgHdr), pCache->szPage, pCache->bPurgeable
);
if( !p ){
return SQLITE_NOMEM;
}
sqlite3GlobalConfig.pcache.xCachesize(p, pCache->nMax);
sqlite3GlobalConfig.pcache2.xCachesize(p, pCache->nMax);
pCache->pCache = p;
}
eCreate = createFlag * (1 + (!pCache->bPurgeable || !pCache->pDirty));
if( pCache->pCache ){
pPage = sqlite3GlobalConfig.pcache.xFetch(pCache->pCache, pgno, eCreate);
pPage = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, eCreate);
}
if( !pPage && eCreate==1 ){
@@ -266,33 +267,36 @@ int sqlite3PcacheFetch(
}
}
pPage = sqlite3GlobalConfig.pcache.xFetch(pCache->pCache, pgno, 2);
pPage = sqlite3GlobalConfig.pcache2.xFetch(pCache->pCache, pgno, 2);
}
if( pPage ){
if( !pPage->pData ){
memset(pPage, 0, sizeof(PgHdr));
pPage->pData = (void *)&pPage[1];
pPage->pExtra = (void*)&((char *)pPage->pData)[pCache->szPage];
memset(pPage->pExtra, 0, pCache->szExtra);
pPage->pCache = pCache;
pPage->pgno = pgno;
}
assert( pPage->pCache==pCache );
assert( pPage->pgno==pgno );
assert( pPage->pData==(void *)&pPage[1] );
assert( pPage->pExtra==(void *)&((char *)&pPage[1])[pCache->szPage] );
pPgHdr = (PgHdr *)pPage->pExtra;
if( 0==pPage->nRef ){
if( !pPgHdr->pPage ){
memset(pPgHdr, 0, sizeof(PgHdr));
pPgHdr->pPage = pPage;
pPgHdr->pData = pPage->pBuf;
pPgHdr->pExtra = (void *)&pPgHdr[1];
memset(pPgHdr->pExtra, 0, pCache->szExtra);
pPgHdr->pCache = pCache;
pPgHdr->pgno = pgno;
}
assert( pPgHdr->pCache==pCache );
assert( pPgHdr->pgno==pgno );
assert( pPgHdr->pData==pPage->pBuf );
assert( pPgHdr->pExtra==(void *)&pPgHdr[1] );
if( 0==pPgHdr->nRef ){
pCache->nRef++;
}
pPage->nRef++;
pPgHdr->nRef++;
if( pgno==1 ){
pCache->pPage1 = pPage;
pCache->pPage1 = pPgHdr;
}
}
*ppPage = pPage;
return (pPage==0 && eCreate) ? SQLITE_NOMEM : SQLITE_OK;
*ppPage = pPgHdr;
return (pPgHdr==0 && eCreate) ? SQLITE_NOMEM : SQLITE_OK;
}
/*
@@ -339,7 +343,7 @@ void sqlite3PcacheDrop(PgHdr *p){
if( p->pgno==1 ){
pCache->pPage1 = 0;
}
sqlite3GlobalConfig.pcache.xUnpin(pCache->pCache, p, 1);
sqlite3GlobalConfig.pcache2.xUnpin(pCache->pCache, p->pPage, 1);
}
/*
@@ -397,7 +401,7 @@ void sqlite3PcacheMove(PgHdr *p, Pgno newPgno){
PCache *pCache = p->pCache;
assert( p->nRef>0 );
assert( newPgno>0 );
sqlite3GlobalConfig.pcache.xRekey(pCache->pCache, p, p->pgno, newPgno);
sqlite3GlobalConfig.pcache2.xRekey(pCache->pCache, p->pPage, p->pgno,newPgno);
p->pgno = newPgno;
if( (p->flags&PGHDR_DIRTY) && (p->flags&PGHDR_NEED_SYNC) ){
pcacheRemoveFromDirtyList(p);
@@ -434,7 +438,7 @@ void sqlite3PcacheTruncate(PCache *pCache, Pgno pgno){
memset(pCache->pPage1->pData, 0, pCache->szPage);
pgno = 1;
}
sqlite3GlobalConfig.pcache.xTruncate(pCache->pCache, pgno+1);
sqlite3GlobalConfig.pcache2.xTruncate(pCache->pCache, pgno+1);
}
}
@@ -443,7 +447,7 @@ void sqlite3PcacheTruncate(PCache *pCache, Pgno pgno){
*/
void sqlite3PcacheClose(PCache *pCache){
if( pCache->pCache ){
sqlite3GlobalConfig.pcache.xDestroy(pCache->pCache);
sqlite3GlobalConfig.pcache2.xDestroy(pCache->pCache);
}
}
@@ -555,7 +559,7 @@ int sqlite3PcachePageRefcount(PgHdr *p){
int sqlite3PcachePagecount(PCache *pCache){
int nPage = 0;
if( pCache->pCache ){
nPage = sqlite3GlobalConfig.pcache.xPagecount(pCache->pCache);
nPage = sqlite3GlobalConfig.pcache2.xPagecount(pCache->pCache);
}
return nPage;
}
@@ -575,7 +579,7 @@ int sqlite3PcacheGetCachesize(PCache *pCache){
void sqlite3PcacheSetCachesize(PCache *pCache, int mxPage){
pCache->nMax = mxPage;
if( pCache->pCache ){
sqlite3GlobalConfig.pcache.xCachesize(pCache->pCache, mxPage);
sqlite3GlobalConfig.pcache2.xCachesize(pCache->pCache, mxPage);
}
}