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Heikki Linnakangas 9fe9ecd516 Allocate all parts of shmem hash table from a single contiguous area 
Previously, the shared header (HASHHDR) and the directory were
allocated by the caller, and passed to hash_create(), while the actual
elements were allocated separately with ShmemAlloc(). After this
commit, all the memory needed by the header, the directory, and all
the elements is allocated using a single ShmemInitStruct() call, and
the different parts are carved out of that allocation. This way the
ShmemIndex entries (and thus pg_shmem_allocations) reflect the size of
the whole hash table, rather than just the directories.

Commit f5930f9a98 attempted this earlier, but it had to be reverted.
The new strategy is to let dynahash.c perform all the allocations with
the alloc function, but have the alloc function carve out the parts
from the one larger allocation. The shared header and the directory
are now also allocated with alloc calls, instead of passing the area
for those directly from the caller.

Reviewed-by: Tomas Vondra <tomas@vondra.me>
Discussion: https://www.postgresql.org/message-id/01ab1d41-3eda-4705-8bbd-af898f5007f1@iki.fi
2026-04-04 02:40:25 +03:00
.github Add CODE_OF_CONDUCT.md, CONTRIBUTING.md, and SECURITY.md. 2024-07-02 13:03:58 -05:00
config Hardcode override of typeof_unqual for clang-for-bitcode 2026-03-16 19:24:49 +01:00
contrib Merge init and max size options on shmem hash tables 2026-04-04 02:40:20 +03:00
doc oauth: Let validators provide failure DETAILs 2026-04-03 16:05:33 -07:00
src Allocate all parts of shmem hash table from a single contiguous area 2026-04-04 02:40:25 +03:00
.cirrus.star ci: Simplify ci-os-only handling 2025-08-14 12:09:34 -04:00
.cirrus.tasks.yml Enable test_cplusplusext with MSVC 2026-04-01 07:48:47 +02:00
.cirrus.yml ci: Per-repo configuration for manually trigger tasks 2025-08-14 11:54:03 -04:00
.dir-locals.el Make Emacs perl-mode indent more like perltidy. 2019-01-13 11:32:31 -08:00
.editorconfig Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.git-blame-ignore-revs Add commit 874da8b1f6 to .git-blame-ignore-revs. 2026-03-30 14:35:24 -05:00
.gitattributes Update .editorconfig and .gitattributes for postgresql.conf.sample. 2025-11-18 10:28:36 -06:00
.gitignore Update top-level .gitignore. 2022-12-04 15:23:00 -05:00
.mailmap Add a Git .mailmap file 2024-11-05 13:56:02 +01:00
aclocal.m4 autoconf: Move export_dynamic determination to configure 2022-12-06 18:55:28 -08:00
configure Check for __cpuidex and __get_cpuid_count separately 2026-04-02 19:39:57 +07:00
configure.ac Check for __cpuidex and __get_cpuid_count separately 2026-04-02 19:39:57 +07:00
COPYRIGHT Update copyright for 2026 2026-01-01 13:24:10 -05:00
GNUmakefile.in Allow selecting the git revision to be packaged by "make dist". 2024-05-03 11:08:50 -04:00
HISTORY Canonicalize some URLs 2020-02-10 20:47:50 +01:00
Makefile Restore AIX support. 2026-02-23 13:34:22 -05:00
meson.build Check for __cpuidex and __get_cpuid_count separately 2026-04-02 19:39:57 +07:00
meson_options.txt Update copyright for 2026 2026-01-01 13:24:10 -05:00
README.md Revise the style of a paragraph in README.md. 2024-03-21 10:16:41 -05:00

README.md

PostgreSQL Database Management System

This directory contains the source code distribution of the PostgreSQL database management system.

PostgreSQL is an advanced object-relational database management system that supports an extended subset of the SQL standard, including transactions, foreign keys, subqueries, triggers, user-defined types and functions. This distribution also contains C language bindings.

Copyright and license information can be found in the file COPYRIGHT.

General documentation about this version of PostgreSQL can be found at https://www.postgresql.org/docs/devel/. In particular, information about building PostgreSQL from the source code can be found at https://www.postgresql.org/docs/devel/installation.html.

The latest version of this software, and related software, may be obtained at https://www.postgresql.org/download/. For more information look at our web site located at https://www.postgresql.org/.