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Overview
| Comment: | Remove an obsolete optimization in pcache that due to more recent changes was recently making the code a little slower. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
c4e7e175eecfd79015f4fae99618dfce |
| User & Date: | drh 2017-09-01 12:57:33 |
Context
|
2017-09-01
| ||
| 14:50 | Add the new sqlite3PagerUnrefPageOne() pager method to deal with the special case of unreferencing page1. check-in: b2e2100c user: drh tags: trunk | |
| 12:57 | Remove an obsolete optimization in pcache that due to more recent changes was recently making the code a little slower. check-in: c4e7e175 user: drh tags: trunk | |
| 12:18 | Small size and performance improvement in pcacheManageDirtyList() by not zeroing the PgHdr.pDirtyNext and PgHdr.pDirtyPrev pointers for PgHdr objects that are not on the dirty list. check-in: 919863b1 user: drh tags: trunk | |
Changes
Changes to src/pcache.c.
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*/
void SQLITE_NOINLINE sqlite3PcacheRelease(PgHdr *p){
assert( p->nRef>0 );
p->pCache->nRefSum--;
if( (--p->nRef)==0 ){
if( p->flags&PGHDR_CLEAN ){
pcacheUnpin(p);
}else if( p->pDirtyPrev!=0 ){ /*OPTIMIZATION-IF-FALSE*/
/* Move the page to the head of the dirty list. If p->pDirtyPrev==0,
** then page p is already at the head of the dirty list and the
** following call would be a no-op. Hence the OPTIMIZATION-IF-FALSE
** tag above. */
pcacheManageDirtyList(p, PCACHE_DIRTYLIST_FRONT);
}
}
}
/*
** Increase the reference count of a supplied page by 1.
|
| < < < < |
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*/
void SQLITE_NOINLINE sqlite3PcacheRelease(PgHdr *p){
assert( p->nRef>0 );
p->pCache->nRefSum--;
if( (--p->nRef)==0 ){
if( p->flags&PGHDR_CLEAN ){
pcacheUnpin(p);
}else{
pcacheManageDirtyList(p, PCACHE_DIRTYLIST_FRONT);
}
}
}
/*
** Increase the reference count of a supplied page by 1.
|