Horton

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

Andres Freund <andres@anarazel.de>

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Commit: 5788e258bb26495fab65ff3aa486268d1c50b123
Author: Andres Freund <andres@anarazel.de>
Date: 2020-08-14T22:33:35Z
Releases: 14.0 
snapshot scalability: Move PGXACT->vacuumFlags to ProcGlobal->vacuumFlags.

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

Files

PathChange+/−
src/backend/access/transam/twophase.c modified +1 −1
src/backend/commands/vacuum.c modified +3 −2
src/backend/postmaster/autovacuum.c modified +3 −3
src/backend/replication/logical/logical.c modified +2 −1
src/backend/replication/slot.c modified +2 −1
src/backend/storage/ipc/procarray.c modified +43 −23
src/backend/storage/lmgr/deadlock.c modified +1 −3
src/backend/storage/lmgr/proc.c modified +10 −6
src/include/storage/proc.h modified +10 −2

Discussion