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Create a distinct wait event for POSIX DSM allocation.

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Previously we displayed "DSMFillZeroWrite" while in posix_fallocate(),
because we shared the same wait event for "mmap" and "posix" DSM types.
Let's introduce a new wait event "DSMAllocate", to be more accurate.

Reported-by: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20220711174518.yldckniicknsxgzl%40awork3.anarazel.de
This commit is contained in:
Thomas Munro
2022-07-14 22:52:13 +12:00
parent 712704d353
commit 7bae3bbf62
4 changed files with 10 additions and 1 deletions
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2
src/backend/storage/ipc/dsm_impl.c
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@@ -364,7 +364,7 @@ dsm_impl_posix_resize(int fd, off_t size)
*/
PG_SETMASK(&BlockSig);
pgstat_report_wait_start(WAIT_EVENT_DSM_FILL_ZERO_WRITE);
pgstat_report_wait_start(WAIT_EVENT_DSM_ALLOCATE);
#if defined(HAVE_POSIX_FALLOCATE) && defined(__linux__)
/*
* On Linux, a shm_open fd is backed by a tmpfs file. If we were to use