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Add a bypass path in sqlite3PagerWrite() for pages with the PGHDR_WRITEABLE

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bit set, for about a 1% performance increase.

FossilOrigin-Name: ba425a6abb9886e6af87b5f6205202db450beba8
This commit is contained in:
drh
2015-06-29 20:53:18 +00:00
parent 60e32edba5
commit b34755308c
3 changed files with 14 additions and 9 deletions
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9
src/pager.c
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@@ -2218,7 +2218,7 @@ static int pager_playback_one_page(
}
}
/* If this page has already been played by before during the current
/* If this page has already been played back before during the current
** rollback, then don't bother to play it back again.
*/
if( pDone && (rc = sqlite3BitvecSet(pDone, pgno))!=SQLITE_OK ){
@@ -5872,7 +5872,11 @@ int sqlite3PagerWrite(PgHdr *pPg){
assert( pPg->pPager->eState>=PAGER_WRITER_LOCKED );
assert( pPg->pPager->eState!=PAGER_ERROR );
assert( assert_pager_state(pPg->pPager) );
if( pPg->pPager->sectorSize > (u32)pPg->pPager->pageSize ){
Pager *pPager = pPg->pPager;
if( (pPg->flags & PGHDR_WRITEABLE)!=0 && pPager->dbSize>=pPg->pgno ){
if( pPager->nSavepoint ) return subjournalPageIfRequired(pPg);
return SQLITE_OK;
}else if( pPager->sectorSize > (u32)pPager->pageSize ){
return pagerWriteLargeSector(pPg);
}else{
return pager_write(pPg);
@@ -5910,6 +5914,7 @@ void sqlite3PagerDontWrite(PgHdr *pPg){
PAGERTRACE(("DONT_WRITE page %d of %d\n", pPg->pgno, PAGERID(pPager)));
IOTRACE(("CLEAN %p %d\n", pPager, pPg->pgno))
pPg->flags |= PGHDR_DONT_WRITE;
pPg->flags &= ~PGHDR_WRITEABLE;
pager_set_pagehash(pPg);
}
}