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Reject huge_pages=on if shared_memory_type=sysv.

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It doesn't work (it could, but hasn't been implemented).
Back-patch to 12, where shared_memory_type arrived.

Reported-by: Alexander Lakhin <exclusion@gmail.com>
Reviewed-by: Alexander Lakhin <exclusion@gmail.com>
Discussion: https://postgr.es/m/163271880203.22789.1125998876173795966@wrigleys.postgresql.org
This commit is contained in:
Thomas Munro 2021-10-26 12:54:55 +13:00
parent a030a0c5cc
commit 8781b0ce25
2 changed files with 9 additions and 1 deletions
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4
doc/src/sgml/config.sgml
View File

@ -1664,7 +1664,9 @@ include_dir 'conf.d'
<para> <para>
At present, this setting is supported only on Linux and Windows. The At present, this setting is supported only on Linux and Windows. The
setting is ignored on other systems when set to setting is ignored on other systems when set to
<literal>try</literal>. <literal>try</literal>. On Linux, it is only supported when
<varname>shared_memory_type</varname> is set to <literal>mmap</literal>
(the default).
</para> </para>
<para> <para>

6
src/backend/port/sysv_shmem.c
View File

@ -703,6 +703,12 @@ PGSharedMemoryCreate(Size size,
errmsg("huge pages not supported on this platform"))); errmsg("huge pages not supported on this platform")));
#endif #endif
/* For now, we don't support huge pages in SysV memory */
if (huge_pages == HUGE_PAGES_ON && shared_memory_type != SHMEM_TYPE_MMAP)
ereport(ERROR,
(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
errmsg("huge pages not supported with the current shared_memory_type setting")));
/* Room for a header? */ /* Room for a header? */
Assert(size > MAXALIGN(sizeof(PGShmemHeader))); Assert(size > MAXALIGN(sizeof(PGShmemHeader)));