| commit | 963d3072af21afbcb1183b3c960135cc7df02f3f | |
| author | Nathan Bossart <nathan@postgresql.org> | |
| Thu, 29 Feb 2024 20:34:10 +0000 (29 14:34 -0600) | ||
| committer | Nathan Bossart <nathan@postgresql.org> | |
| Thu, 29 Feb 2024 20:34:10 +0000 (29 14:34 -0600) | ||
| tree | 95f67624ab4f71c046ca0dcd4afd22a22624c714 | treesnapshot (tar.gz zip) |
| parent | 3179701505b9ec58243ffba9d22b1803f320bf60 | commitdiff |
Convert unloggedLSN to an atomic variable.
Currently, this variable is an XLogRecPtr protected by a spinlock.
By converting it to an atomic variable, we can remove the spinlock,
which saves a small amount of shared memory space. Since this code
is not performance-critical, we use atomic operations with full
barrier semantics to make it easy to reason about correctness.
Author: John Morris
Reviewed-by: Michael Paquier, Robert Haas, Andres Freund, Stephen Frost, Bharath Rupireddy
Discussion: https://postgr.es/m/BYAPR13MB26772534335255E50318C574A0409%40BYAPR13MB2677.namprd13.prod.outlook.com
Discussion: https://postgr.es/m/MN2PR13MB2688FD8B757316CB5C54C8A2A0DDA%40MN2PR13MB2688.namprd13.prod.outlook.com
Currently, this variable is an XLogRecPtr protected by a spinlock.
By converting it to an atomic variable, we can remove the spinlock,
which saves a small amount of shared memory space. Since this code
is not performance-critical, we use atomic operations with full
barrier semantics to make it easy to reason about correctness.
Author: John Morris
Reviewed-by: Michael Paquier, Robert Haas, Andres Freund, Stephen Frost, Bharath Rupireddy
Discussion: https://postgr.es/m/BYAPR13MB26772534335255E50318C574A0409%40BYAPR13MB2677.namprd13.prod.outlook.com
Discussion: https://postgr.es/m/MN2PR13MB2688FD8B757316CB5C54C8A2A0DDA%40MN2PR13MB2688.namprd13.prod.outlook.com
| src/backend/access/transam/xlog.c | diffblobblamehistory |