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| author | Thomas Munro <tmunro@postgresql.org> | 2018-06-26 17:56:20 +1200 |
|---|---|---|
| committer | Thomas Munro <tmunro@postgresql.org> | 2018-06-26 17:56:20 +1200 |
| commit | 7bcda60d41cb920193e9d56a3b03583d7998c635 (patch) | |
| tree | ace89ddb3829c83f4cfda0272cf5da2dd64b3623 /src/backend/executor/nodeResult.c | |
| parent | 910e2aca129cf0cda759c57920141c044aa1a8ba (diff) | |
| download | postgresql-7bcda60d41cb920193e9d56a3b03583d7998c635.tar.gz postgresql-7bcda60d41cb920193e9d56a3b03583d7998c635.zip | |
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
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