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Overview
Comment: | Reduce the number of calls to the subjRequiresPage() routine inside of pager. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
e50ff39a93a51b5a5be4f0e82a76104b |
User & Date: | drh 2013-12-13 19:48:04.970 |
Context
2013-12-13
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20:45 | Performance optimizations in the pager_write() routine of pager.c. (check-in: bc5febef92 user: drh tags: trunk) | |
19:48 | Reduce the number of calls to the subjRequiresPage() routine inside of pager. (check-in: e50ff39a93 user: drh tags: trunk) | |
19:35 | Create and use a new pager interface sqlite3PagerUnrefNotNull() that works just like sqlite3PagerUnref() but guarantees that its argument is not a NULL pointer. (check-in: e00f37e233 user: drh tags: trunk) | |
Changes
Changes to src/pager.c.
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1020 1021 1022 1023 1024 1025 1026 | ** * The page-number is less than or equal to PagerSavepoint.nOrig, and ** * The bit corresponding to the page-number is not set in ** PagerSavepoint.pInSavepoint. */ static int subjRequiresPage(PgHdr *pPg){ Pager *pPager = pPg->pPager; PagerSavepoint *p; | | < < | | | | < | 1020 1021 1022 1023 1024 1025 1026 1027 1028 1029 1030 1031 1032 1033 1034 1035 1036 1037 1038 1039 | ** * The page-number is less than or equal to PagerSavepoint.nOrig, and ** * The bit corresponding to the page-number is not set in ** PagerSavepoint.pInSavepoint. */ static int subjRequiresPage(PgHdr *pPg){ Pager *pPager = pPg->pPager; PagerSavepoint *p; Pgno pgno = pPg->pgno; int i; for(i=0; i<pPager->nSavepoint; i++){ p = &pPager->aSavepoint[i]; if( p->nOrig>=pgno && 0==sqlite3BitvecTest(p->pInSavepoint, pgno) ){ return 1; } } return 0; } /* ** Return true if the page is already in the journal file. |
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5673 5674 5675 5676 5677 5678 5679 | assert( pPager->eState>=PAGER_WRITER_CACHEMOD ); assert( assert_pager_state(pPager) ); /* Mark the page as dirty. If the page has already been written ** to the journal then we can return right away. */ sqlite3PcacheMakeDirty(pPg); | | | 5670 5671 5672 5673 5674 5675 5676 5677 5678 5679 5680 5681 5682 5683 5684 | assert( pPager->eState>=PAGER_WRITER_CACHEMOD ); assert( assert_pager_state(pPager) ); /* Mark the page as dirty. If the page has already been written ** to the journal then we can return right away. */ sqlite3PcacheMakeDirty(pPg); if( pageInJournal(pPg) && (pPager->nSavepoint==0 || !subjRequiresPage(pPg)) ){ assert( !pagerUseWal(pPager) ); }else{ /* The transaction journal now exists and we have a RESERVED or an ** EXCLUSIVE lock on the main database file. Write the current page to ** the transaction journal if it is not there already. */ |
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