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snapshot scalability: Move PGXACT->vacuumFlags to ProcGlobal->vacuumFlags.

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Similar to the previous commit this increases the chance that data
frequently needed by GetSnapshotData() stays in l2 cache. As we now
take care to not unnecessarily write to ProcGlobal->vacuumFlags, there
should be very few modifications to the ProcGlobal->vacuumFlags array.

Author: Andres Freund <andres@anarazel.de>
Reviewed-By: Robert Haas <robertmhaas@gmail.com>
Reviewed-By: Thomas Munro <thomas.munro@gmail.com>
Reviewed-By: David Rowley <dgrowleyml@gmail.com>
Discussion: https://postgr.es/m/20200301083601.ews6hz5dduc3w2se@alap3.anarazel.de
This commit is contained in:
Andres Freund
2020-07-15 15:35:07 -07:00
parent 941697c3c1
commit 5788e258bb
9 changed files with 75 additions and 42 deletions
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3
src/backend/replication/logical/logical.c
View File

@@ -181,7 +181,8 @@ StartupDecodingContext(List *output_plugin_options,
if (!IsTransactionOrTransactionBlock())
{
LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
MyPgXact->vacuumFlags |= PROC_IN_LOGICAL_DECODING;
MyProc->vacuumFlags |= PROC_IN_LOGICAL_DECODING;
ProcGlobal->vacuumFlags[MyProc->pgxactoff] = MyProc->vacuumFlags;
LWLockRelease(ProcArrayLock);
}

3
src/backend/replication/slot.c
View File

@@ -520,7 +520,8 @@ ReplicationSlotRelease(void)
/* might not have been set when we've been a plain slot */
LWLockAcquire(ProcArrayLock, LW_EXCLUSIVE);
MyPgXact->vacuumFlags &= ~PROC_IN_LOGICAL_DECODING;
MyProc->vacuumFlags &= ~PROC_IN_LOGICAL_DECODING;
ProcGlobal->vacuumFlags[MyProc->pgxactoff] = MyProc->vacuumFlags;
LWLockRelease(ProcArrayLock);
}