Re: Improve read_local_xlog_page_guts by replacing polling with latch-based waiting

Xuneng Zhou <xunengzhou@gmail.com>

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From: Xuneng Zhou <xunengzhou@gmail.com>

To: pgsql-hackers <pgsql-hackers@lists.postgresql.org>

Cc: Alexander Korotkov <aekorotkov@gmail.com>, Heikki Linnakangas <hlinnaka@iki.fi>

Date: 2025-08-28T08:22:55Z

Lists: pgsql-hackers

Attachments

v8-0001-Implement-WAIT-FOR-command.patch (application/octet-stream) patch v8-0001
v3-0000-cover-letter.patch (application/octet-stream)
v3-0002-Improve-read_local_xlog_page_guts-by-replacing-po.patch (application/octet-stream) patch v3-0002

Hi,

Some changes in v3:
1) Update the note of xlogwait.c to reflect the extending of its use
for flush waiting and internal use for both flush and replay waiting.
2) Update the comment above logical_read_xlog_page which describes the
prior-change behavior of read_local_xlog_page.

Best,
Xuneng

Commits

Add infrastructure for efficient LSN waiting
- 3b4e53a075ea 19 (unreleased) landed
Add pairingheap_initialize() for shared memory usage
- 8af3ae0d4b36 19 (unreleased) landed
Implement WAIT FOR command
- 447aae13b030 19 (unreleased) landed