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| author | Michael Paquier <michael@paquier.xyz> | 2022-04-07 14:34:37 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2022-04-07 14:34:37 +0900 |
| commit | 06f5295af673df795e8e70e28c43d61c2817b6df (patch) | |
| tree | 12890d4f2fd35f2ff632474406439b014c8c5c3f /src/backend/executor/tqueue.c | |
| parent | fbfe6910eca0d6a61cbcdd27cdd5a8d9de6477fa (diff) | |
| download | postgresql-06f5295af673df795e8e70e28c43d61c2817b6df.tar.gz postgresql-06f5295af673df795e8e70e28c43d61c2817b6df.zip | |
Add single-item cache when looking at topmost XID of a subtrans XID
This change affects SubTransGetTopmostTransaction(), used to find the
topmost transaction ID of a given transaction ID. The cache is able to
store one value, so as we can save the backend from unnecessary lookups
at pg_subtrans/ on repetitive calls of this routine. There is a similar
practice in transam.c, for example.
Author: Simon Riggs
Reviewed-by: Andrey Borodin, Julien Rouhaud
Discussion: https://postgr.es/m/CANbhV-G8Co=yq4v4BkW7MJDqVt68K_8A48nAZ_+8UQS7LrwLEQ@mail.gmail.com
Diffstat (limited to 'src/backend/executor/tqueue.c')
0 files changed, 0 insertions, 0 deletions