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Overview
| Comment: | Remove a redundant condition from pcache.c. Add an OPTIMIZATION-IF-TRUE comment to another condition that requires it. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: |
3bfd2621d13b4f842f3af6d35519653f |
| User & Date: | dan 2016-05-11 20:03:23 |
Context
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2016-05-12
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| 09:48 | Add a missing OPTIMIZATION-IF-FALSE comment to pcache.c. (check-in: bc202e5b user: dan tags: trunk) | |
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2016-05-11
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| 23:54 | For in-memory databases, it does not matter if pcache entries are marked "clean" or "writable". (Closed-Leaf check-in: ad601c79 user: drh tags: pager-dev) | |
| 20:03 | Remove a redundant condition from pcache.c. Add an OPTIMIZATION-IF-TRUE comment to another condition that requires it. (check-in: 3bfd2621 user: dan tags: trunk) | |
| 15:41 | Remove some a small amount of redundant code related to PCache.pSynced from pcache.c. (check-in: 9cc8cad7 user: dan tags: trunk) | |
Changes
Changes to src/pcache.c.
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}else{
assert( pPage==p->pDirtyTail );
p->pDirtyTail = pPage->pDirtyPrev;
}
if( pPage->pDirtyPrev ){
pPage->pDirtyPrev->pDirtyNext = pPage->pDirtyNext;
}else{
assert( pPage==p->pDirty );
p->pDirty = pPage->pDirtyNext;
if( p->pDirty==0 && p->bPurgeable ){
assert( p->eCreate==1 );
p->eCreate = 2;
}
}
pPage->pDirtyNext = 0;
pPage->pDirtyPrev = 0;
}
if( addRemove & PCACHE_DIRTYLIST_ADD ){
................................................................................
int eCreate;
sqlite3_pcache_page *pRes;
assert( pCache!=0 );
assert( pCache->pCache!=0 );
assert( createFlag==3 || createFlag==0 );
assert( pgno>0 );
/* eCreate defines what to do if the page does not exist.
** 0 Do not allocate a new page. (createFlag==0)
** 1 Allocate a new page if doing so is inexpensive.
** (createFlag==1 AND bPurgeable AND pDirty)
** 2 Allocate a new page even it doing so is difficult.
** (createFlag==1 AND !(bPurgeable AND pDirty)
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}else{
assert( pPage==p->pDirtyTail );
p->pDirtyTail = pPage->pDirtyPrev;
}
if( pPage->pDirtyPrev ){
pPage->pDirtyPrev->pDirtyNext = pPage->pDirtyNext;
}else{
/* If there are now no dirty pages in the cache, set eCreate to 2.
** This is an optimization that allows sqlite3PcacheFetch() to skip
** searching for a dirty page to eject from the cache when it might
** otherwise have to. */
assert( pPage==p->pDirty );
p->pDirty = pPage->pDirtyNext;
assert( p->bPurgeable || p->eCreate==2 );
if( p->pDirty==0 ){ /*OPTIMIZATION-IF-TRUE*/
assert( p->bPurgeable==0 || p->eCreate==1 );
p->eCreate = 2;
}
}
pPage->pDirtyNext = 0;
pPage->pDirtyPrev = 0;
}
if( addRemove & PCACHE_DIRTYLIST_ADD ){
................................................................................
int eCreate;
sqlite3_pcache_page *pRes;
assert( pCache!=0 );
assert( pCache->pCache!=0 );
assert( createFlag==3 || createFlag==0 );
assert( pgno>0 );
assert( pCache->eCreate==((pCache->bPurgeable && pCache->pDirty) ? 1 : 2) );
/* eCreate defines what to do if the page does not exist.
** 0 Do not allocate a new page. (createFlag==0)
** 1 Allocate a new page if doing so is inexpensive.
** (createFlag==1 AND bPurgeable AND pDirty)
** 2 Allocate a new page even it doing so is difficult.
** (createFlag==1 AND !(bPurgeable AND pDirty)
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