Horton

Move RecoveryLockList into a hash table.

Thomas Munro <tmunro@postgresql.org>

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Commit: a40cff8956e842f737739d93a7b160f0b4a03d13
Author: Thomas Munro <tmunro@postgresql.org>
Date: 2018-06-26T06:45:45Z
Releases: 11.0 
Move RecoveryLockList into a hash table.

Standbys frequently need to release all locks held by a given xid.
Instead of searching one big list linearly, let's create one list
per xid and put them in a hash table, so we can find what we need
in O(1) time.

Earlier analysis and a prototype were done by David Rowley, though
this isn't his patch.

Back-patch all the way.

Author: Thomas Munro
Diagnosed-by: David Rowley, Andres Freund
Reviewed-by: Andres Freund, Tom Lane, Robert Haas
Discussion: https://postgr.es/m/CAEepm%3D1mL0KiQ2KJ4yuPpLGX94a4Ns_W6TL4EGRouxWibu56pA%40mail.gmail.com
Discussion: https://postgr.es/m/CAKJS1f9vJ841HY%3DwonnLVbfkTWGYWdPN72VMxnArcGCjF3SywA%40mail.gmail.com

Files

PathChange+/−
src/backend/storage/ipc/standby.c modified +92 −83

Discussion