Revision - af8f9ec - Re-bin segment when memory pages are freed. - origin: https://github.com/postgres/postgres

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Revision af8f9ec66bd19a920d02b4c0eb65b3dd6057d324 authored by Thomas Munro on 04 July 2023, 03:16:34 UTC, committed by Thomas Munro on 04 July 2023, 03:21:36 UTC

Re-bin segment when memory pages are freed.

It's OK to be lazy about re-binning memory segments when allocating,
because that can only leave segments in a bin that's too high.  We'll
search higher bins if necessary while allocating next time, and
also eventually re-bin, so no memory can become unreachable that way.

However, when freeing memory, the largest contiguous range of free pages
might go up, so we should re-bin eagerly to make sure we don't leave the
segment in a bin that is too low for get_best_segment() to find.

The re-binning code is moved into a function of its own, so it can be
called whenever free pages are returned to the segment's free page map.

Back-patch to all supported releases.

Author: Dongming Liu <ldming101@gmail.com>
Reviewed-by: Robert Haas <robertmhaas@gmail.com> (earlier version)
Reviewed-by: Thomas Munro <thomas.munro@gmail.com>
Discussion: https://postgr.es/m/CAL1p7e8LzB2LSeAXo2pXCW4%2BRya9s0sJ3G_ReKOU%3DAjSUWjHWQ%40mail.gmail.com

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Tip revision: af8f9ec66bd19a920d02b4c0eb65b3dd6057d324 authored by Thomas Munro on 04 July 2023, 03:16:34 UTC
Re-bin segment when memory pages are freed.

Tip revision: af8f9ec

File	Mode	Size
config
contrib
doc
src
.cirrus.yml	-rw-r--r--	24.3 KB
.dir-locals.el	-rw-r--r--	730 bytes
.editorconfig	-rw-r--r--	183 bytes
.git-blame-ignore-revs	-rw-r--r--	10.2 KB
.gitattributes	-rw-r--r--	1.5 KB
.gitignore	-rw-r--r--	674 bytes
COPYRIGHT	-rw-r--r--	1.2 KB
GNUmakefile.in	-rw-r--r--	4.2 KB
HISTORY	-rw-r--r--	277 bytes
Makefile	-rw-r--r--	1.8 KB
README	-rw-r--r--	1.2 KB
README.git	-rw-r--r--	721 bytes
aclocal.m4	-rw-r--r--	365 bytes
configure	-rwxr-xr-x	570.5 KB
configure.ac	-rw-r--r--	85.1 KB
meson.build	-rw-r--r--	99.6 KB
meson_options.txt	-rw-r--r--	6.1 KB

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Re-bin segment when memory pages are freed.

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