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Introduce GUC shared_memory_size

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This runtime-computed GUC shows the size of the server's main shared
memory area, taking into account the amount of shared memory allocated
by extensions as this is calculated after processing
shared_preload_libraries.

Author: Nathan Bossart
Discussion: https://postgr.es/m/F2772387-CE0F-46BF-B5F1-CC55516EB885@amazon.com
This commit is contained in:
Michael Paquier
2021-09-08 12:02:30 +09:00
parent fd0625c7a9
commit bd1788051b
5 changed files with 56 additions and 0 deletions
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22
src/backend/storage/ipc/ipci.c
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@@ -313,3 +313,25 @@ CreateSharedMemoryAndSemaphores(void)
if (shmem_startup_hook)
shmem_startup_hook();
}
/*
* InitializeShmemGUCs
*
* This function initializes runtime-computed GUCs related to the amount of
* shared memory required for the current configuration.
*/
void
InitializeShmemGUCs(void)
{
char buf[64];
Size size_b;
Size size_mb;
/*
* Calculate the shared memory size and round up to the nearest megabyte.
*/
size_b = CalculateShmemSize(NULL);
size_mb = add_size(size_b, (1024 * 1024) - 1) / (1024 * 1024);
sprintf(buf, "%lu", size_mb);
SetConfigOption("shared_memory_size", buf, PGC_INTERNAL, PGC_S_OVERRIDE);
}