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Overview
| Comment: | Change page quantities in pcache1.c to unsigned. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
da52e6e8b490508bc1ee4700aa45a79f |
| User & Date: | drh 2012-01-02 18:00:55 |
Context
|
2012-01-02
| ||
| 18:20 | Remove the code that attempts to find the sector size from the OS and hardcode the xSectorSize methods of the unix and windows VFSes to return SQLITE_DEFAULT_SECTOR_SIZE, which is now set to 4096 unless overridden. check-in: 03d8362c user: drh tags: trunk | |
| 18:00 | Change page quantities in pcache1.c to unsigned. check-in: da52e6e8 user: drh tags: trunk | |
| 16:38 | Remove an incorrect assert() in btree.c. check-in: c1691d99 user: drh tags: trunk | |
Changes
Changes to src/pcache1.c.
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 ... 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 ... 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 ... 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 .... 1006 1007 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 |
**
** For mode (1), PGroup.mutex is NULL. For mode (2) there is only a single
** PGroup which is the pcache1.grp global variable and its mutex is
** SQLITE_MUTEX_STATIC_LRU.
*/
struct PGroup {
sqlite3_mutex *mutex; /* MUTEX_STATIC_LRU or NULL */
int nMaxPage; /* Sum of nMax for purgeable caches */
int nMinPage; /* Sum of nMin for purgeable caches */
int mxPinned; /* nMaxpage + 10 - nMinPage */
int nCurrentPage; /* Number of purgeable pages allocated */
PgHdr1 *pLruHead, *pLruTail; /* LRU list of unpinned pages */
};
/* Each page cache is an instance of the following object. Every
** open database file (including each in-memory database and each
** temporary or transient database) has a single page cache which
** is an instance of this object.
................................................................................
** 5. Otherwise, allocate and return a new page buffer.
*/
static sqlite3_pcache_page *pcache1Fetch(
sqlite3_pcache *p,
unsigned int iKey,
int createFlag
){
int nPinned;
PCache1 *pCache = (PCache1 *)p;
PGroup *pGroup;
PgHdr1 *pPage = 0;
assert( pCache->bPurgeable || createFlag!=1 );
assert( pCache->bPurgeable || pCache->nMin==0 );
assert( pCache->bPurgeable==0 || pCache->nMin==10 );
................................................................................
** this point.
*/
#ifdef SQLITE_MUTEX_OMIT
pGroup = pCache->pGroup;
#endif
/* Step 3: Abort if createFlag is 1 but the cache is nearly full */
nPinned = pCache->nPage - pCache->nRecyclable;
assert( nPinned>=0 );
assert( pGroup->mxPinned == pGroup->nMaxPage + 10 - pGroup->nMinPage );
assert( pCache->n90pct == pCache->nMax*9/10 );
if( createFlag==1 && (
nPinned>=pGroup->mxPinned
|| nPinned>=(int)pCache->n90pct
|| pcache1UnderMemoryPressure(pCache)
)){
goto fetch_out;
}
if( pCache->nPage>=pCache->nHash && pcache1ResizeHash(pCache) ){
goto fetch_out;
................................................................................
*/
static void pcache1Destroy(sqlite3_pcache *p){
PCache1 *pCache = (PCache1 *)p;
PGroup *pGroup = pCache->pGroup;
assert( pCache->bPurgeable || (pCache->nMax==0 && pCache->nMin==0) );
pcache1EnterMutex(pGroup);
pcache1TruncateUnsafe(pCache, 0);
pGroup->nMaxPage -= pCache->nMax;
pGroup->nMinPage -= pCache->nMin;
pGroup->mxPinned = pGroup->nMaxPage + 10 - pGroup->nMinPage;
pcache1EnforceMaxPage(pGroup);
pcache1LeaveMutex(pGroup);
sqlite3_free(pCache->apHash);
sqlite3_free(pCache);
}
................................................................................
){
PgHdr1 *p;
int nRecyclable = 0;
for(p=pcache1.grp.pLruHead; p; p=p->pLruNext){
nRecyclable++;
}
*pnCurrent = pcache1.grp.nCurrentPage;
*pnMax = pcache1.grp.nMaxPage;
*pnMin = pcache1.grp.nMinPage;
*pnRecyclable = nRecyclable;
}
#endif
|
| | | | | > < | > > | | |
44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 ... 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 ... 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 ... 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 .... 1008 1009 1010 1011 1012 1013 1014 1015 1016 1017 1018 1019 |
**
** For mode (1), PGroup.mutex is NULL. For mode (2) there is only a single
** PGroup which is the pcache1.grp global variable and its mutex is
** SQLITE_MUTEX_STATIC_LRU.
*/
struct PGroup {
sqlite3_mutex *mutex; /* MUTEX_STATIC_LRU or NULL */
unsigned int nMaxPage; /* Sum of nMax for purgeable caches */
unsigned int nMinPage; /* Sum of nMin for purgeable caches */
unsigned int mxPinned; /* nMaxpage + 10 - nMinPage */
unsigned int nCurrentPage; /* Number of purgeable pages allocated */
PgHdr1 *pLruHead, *pLruTail; /* LRU list of unpinned pages */
};
/* Each page cache is an instance of the following object. Every
** open database file (including each in-memory database and each
** temporary or transient database) has a single page cache which
** is an instance of this object.
................................................................................
** 5. Otherwise, allocate and return a new page buffer.
*/
static sqlite3_pcache_page *pcache1Fetch(
sqlite3_pcache *p,
unsigned int iKey,
int createFlag
){
unsigned int nPinned;
PCache1 *pCache = (PCache1 *)p;
PGroup *pGroup;
PgHdr1 *pPage = 0;
assert( pCache->bPurgeable || createFlag!=1 );
assert( pCache->bPurgeable || pCache->nMin==0 );
assert( pCache->bPurgeable==0 || pCache->nMin==10 );
................................................................................
** this point.
*/
#ifdef SQLITE_MUTEX_OMIT
pGroup = pCache->pGroup;
#endif
/* Step 3: Abort if createFlag is 1 but the cache is nearly full */
assert( pCache->nPage >= pCache->nRecyclable );
nPinned = pCache->nPage - pCache->nRecyclable;
assert( pGroup->mxPinned == pGroup->nMaxPage + 10 - pGroup->nMinPage );
assert( pCache->n90pct == pCache->nMax*9/10 );
if( createFlag==1 && (
nPinned>=pGroup->mxPinned
|| nPinned>=pCache->n90pct
|| pcache1UnderMemoryPressure(pCache)
)){
goto fetch_out;
}
if( pCache->nPage>=pCache->nHash && pcache1ResizeHash(pCache) ){
goto fetch_out;
................................................................................
*/
static void pcache1Destroy(sqlite3_pcache *p){
PCache1 *pCache = (PCache1 *)p;
PGroup *pGroup = pCache->pGroup;
assert( pCache->bPurgeable || (pCache->nMax==0 && pCache->nMin==0) );
pcache1EnterMutex(pGroup);
pcache1TruncateUnsafe(pCache, 0);
assert( pGroup->nMaxPage >= pCache->nMax );
pGroup->nMaxPage -= pCache->nMax;
assert( pGroup->nMinPage >= pCache->nMin );
pGroup->nMinPage -= pCache->nMin;
pGroup->mxPinned = pGroup->nMaxPage + 10 - pGroup->nMinPage;
pcache1EnforceMaxPage(pGroup);
pcache1LeaveMutex(pGroup);
sqlite3_free(pCache->apHash);
sqlite3_free(pCache);
}
................................................................................
){
PgHdr1 *p;
int nRecyclable = 0;
for(p=pcache1.grp.pLruHead; p; p=p->pLruNext){
nRecyclable++;
}
*pnCurrent = pcache1.grp.nCurrentPage;
*pnMax = (int)pcache1.grp.nMaxPage;
*pnMin = (int)pcache1.grp.nMinPage;
*pnRecyclable = nRecyclable;
}
#endif
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