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Tune BufferGetLSNAtomic() when checksums !enabled

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From performance analysis by Heikki Linnakangas
This commit is contained in:
Simon Riggs 2013-04-07 22:37:39 +01:00
parent cf8dc9e10c
commit 1be203519a
1 changed files with 4 additions and 2 deletions
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6
src/backend/storage/buffer/bufmgr.c
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@ -2079,8 +2079,10 @@ BufferGetLSNAtomic(Buffer buffer)
char *page = BufferGetPage(buffer);
XLogRecPtr lsn;
/* Local buffers don't need a lock. */
if (BufferIsLocal(buffer))
/*
* If we don't need locking for correctness, fastpath out.
*/
if (!DataChecksumsEnabled() || BufferIsLocal(buffer))
return PageGetLSN(page);
/* Make sure we've got a real buffer, and that we hold a pin on it. */