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Avoid SnapshotResetXmin() during AtEOXact_Snapshot()

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For normal commits and aborts we already reset PgXact->xmin
Avoiding touching highly contented shmem improves concurrent
performance.

Simon Riggs

Discussion: CANP8+jJdXE9b+b9F8CQT-LuxxO0PBCB-SZFfMVAdp+akqo4zfg@mail.gmail.com
This commit is contained in:
Simon Riggs
2017-03-24 14:20:59 +00:00
parent 8398c83689
commit 42b4b0b241
3 changed files with 22 additions and 7 deletions
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6
src/backend/access/transam/xact.c
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@ -2137,7 +2137,7 @@ CommitTransaction(void)
AtEOXact_ComboCid();
AtEOXact_HashTables(true);
AtEOXact_PgStat(true);
AtEOXact_Snapshot(true);
AtEOXact_Snapshot(true, false);
AtCommit_ApplyLauncher();
pgstat_report_xact_timestamp(0);
@ -2409,7 +2409,7 @@ PrepareTransaction(void)
AtEOXact_ComboCid();
AtEOXact_HashTables(true);
/* don't call AtEOXact_PgStat here; we fixed pgstat state above */
AtEOXact_Snapshot(true);
AtEOXact_Snapshot(true, true);
pgstat_report_xact_timestamp(0);
CurrentResourceOwner = NULL;
@ -2640,7 +2640,7 @@ CleanupTransaction(void)
* do abort cleanup processing
*/
AtCleanup_Portals(); /* now safe to release portal memory */
AtEOXact_Snapshot(false); /* and release the transaction's snapshots */
AtEOXact_Snapshot(false, false); /* and release the transaction's snapshots */
CurrentResourceOwner = NULL; /* and resource owner */
if (TopTransactionResourceOwner)