f5930f9a98
pg_shmem_allocations tracks the memory allocated by ShmemInitStruct(), but for shared hash tables that covered only the header and hash directory. The remaining parts (segments and buckets) were allocated later using ShmemAlloc(), which does not update the shmem accounting. Thus, these allocations were not shown in pg_shmem_allocations. This commit improves the situation by allocating all the hash table parts at once, using a single ShmemInitStruct() call. This way the ShmemIndex entries (and thus pg_shmem_allocations) better reflect the proper size of the hash table. This affects allocations for private (non-shared) hash tables too, as the hash_create() code is shared. For non-shared tables this however makes no practical difference. This changes the alignment a bit. ShmemAlloc() aligns the chunks using CACHELINEALIGN(), which means some parts (header, directory, segments) were aligned this way. Allocating all parts as a single chunk removes this (implicit) alignment. We've considered adding explicit alignment, but we've decided not to - it seems to be merely a coincidence due to using the ShmemAlloc() API, not due to necessity. Author: Rahila Syed <rahilasyed90@gmail.com> Reviewed-by: Andres Freund <andres@anarazel.de> Reviewed-by: Nazir Bilal Yavuz <byavuz81@gmail.com> Reviewed-by: Tomas Vondra <tomas@vondra.me> Discussion: https://postgr.es/m/CAH2L28vHzRankszhqz7deXURxKncxfirnuW68zD7+hVAqaS5GQ@mail.gmail.com
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/.