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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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4
src/backend/storage/lmgr/deadlock.c
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@@ -544,7 +544,6 @@ FindLockCycleRecurseMember(PGPROC *checkProc,
{
PGPROC *proc;
LOCK *lock = checkProc->waitLock;
PGXACT *pgxact;
PROCLOCK *proclock;
SHM_QUEUE *procLocks;
LockMethod lockMethodTable;
@@ -582,7 +581,6 @@ FindLockCycleRecurseMember(PGPROC *checkProc,
PGPROC *leader;
proc = proclock->tag.myProc;
pgxact = &ProcGlobal->allPgXact[proc->pgprocno];
leader = proc->lockGroupLeader == NULL ? proc : proc->lockGroupLeader;
/* A proc never blocks itself or any other lock group member */
@@ -630,7 +628,7 @@ FindLockCycleRecurseMember(PGPROC *checkProc,
* ProcArrayLock.
*/
if (checkProc == MyProc &&
pgxact->vacuumFlags & PROC_IS_AUTOVACUUM)
proc->vacuumFlags & PROC_IS_AUTOVACUUM)
blocking_autovacuum_proc = proc;
/* We're done looking at this proclock */