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| author | Michael Paquier <michael@paquier.xyz> | 2021-09-08 12:02:30 +0900 |
|---|---|---|
| committer | Michael Paquier <michael@paquier.xyz> | 2021-09-08 12:02:30 +0900 |
| commit | bd1788051b02cfddcd9ef0e2fd094972f372b8fd (patch) | |
| tree | a0bc449c2d8a6b6e91fe96d7b2353c3d91339085 /src/backend/storage/ipc/ipci.c | |
| parent | fd0625c7a9c679c0c1e896014b8f49a489c3a245 (diff) | |
| download | postgresql-bd1788051b02cfddcd9ef0e2fd094972f372b8fd.tar.gz postgresql-bd1788051b02cfddcd9ef0e2fd094972f372b8fd.zip | |
Introduce GUC shared_memory_size
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
Diffstat (limited to 'src/backend/storage/ipc/ipci.c')
| -rw-r--r-- | src/backend/storage/ipc/ipci.c | 22 |
1 files changed, 22 insertions, 0 deletions
diff --git a/src/backend/storage/ipc/ipci.c b/src/backend/storage/ipc/ipci.c index 64bc16fa848..1a408ad77e5 100644 --- a/src/backend/storage/ipc/ipci.c +++ b/src/backend/storage/ipc/ipci.c @@ -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); +} |