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Overview
| Comment: | Minor performance optimization in pcache1.c. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 2e8ad2ead9d146e312c693d9b967bbd5 |
| User & Date: | drh 2015-06-12 13:04:51 |
Context
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2015-06-13
| ||
| 11:19 | Omit mutex calls in pcache1 when the mutex is NULL, for a significant performance improvement. check-in: caf8f574 user: drh tags: trunk | |
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2015-06-12
| ||
| 13:49 | Add a fast-path implementation of pcache1Fetch() for the common case of separate caches that do not use a mutex. check-in: 760700ed user: drh tags: faster-pcache1-fetch | |
| 13:04 | Minor performance optimization in pcache1.c. check-in: 2e8ad2ea user: drh tags: trunk | |
| 12:54 | Add the OP_ColumnsUsed opcode (when compiled with SQLITE_ENABLE_COLUMN_USED_MASK) as a hint to the b-tree layer as to which columns of a btree cursor will be used. check-in: 711a176c user: drh tags: trunk | |
Changes
Changes to src/pcache1.c.
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** PGroup LRU list, if is part of it. If pPage is not part of the PGroup
** LRU list, then this function is a no-op.
**
** The PGroup mutex must be held when this function is called.
*/
static void pcache1PinPage(PgHdr1 *pPage){
PCache1 *pCache;
PGroup *pGroup;
assert( pPage!=0 );
assert( pPage->isPinned==0 );
pCache = pPage->pCache;
pGroup = pCache->pGroup;
assert( pPage->pLruNext || pPage==pGroup->pLruTail );
assert( pPage->pLruPrev || pPage==pGroup->pLruHead );
assert( sqlite3_mutex_held(pGroup->mutex) );
if( pPage->pLruPrev ){
pPage->pLruPrev->pLruNext = pPage->pLruNext;
}else{
pGroup->pLruHead = pPage->pLruNext;
}
if( pPage->pLruNext ){
pPage->pLruNext->pLruPrev = pPage->pLruPrev;
}else{
pGroup->pLruTail = pPage->pLruPrev;
}
pPage->pLruNext = 0;
pPage->pLruPrev = 0;
pPage->isPinned = 1;
pCache->nRecyclable--;
}
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** PGroup LRU list, if is part of it. If pPage is not part of the PGroup
** LRU list, then this function is a no-op.
**
** The PGroup mutex must be held when this function is called.
*/
static void pcache1PinPage(PgHdr1 *pPage){
PCache1 *pCache;
assert( pPage!=0 );
assert( pPage->isPinned==0 );
pCache = pPage->pCache;
assert( pPage->pLruNext || pPage==pCache->pGroup->pLruTail );
assert( pPage->pLruPrev || pPage==pCache->pGroup->pLruHead );
assert( sqlite3_mutex_held(pCache->pGroup->mutex) );
if( pPage->pLruPrev ){
pPage->pLruPrev->pLruNext = pPage->pLruNext;
}else{
pCache->pGroup->pLruHead = pPage->pLruNext;
}
if( pPage->pLruNext ){
pPage->pLruNext->pLruPrev = pPage->pLruPrev;
}else{
pCache->pGroup->pLruTail = pPage->pLruPrev;
}
pPage->pLruNext = 0;
pPage->pLruPrev = 0;
pPage->isPinned = 1;
pCache->nRecyclable--;
}
|