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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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5
doc/src/sgml/monitoring.sgml
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@ -1296,6 +1296,11 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<entry><literal>CopyFileWrite</literal></entry>
<entry>Waiting for a write during a file copy operation.</entry>
</row>
<row>
<entry><literal>DSMAllocate</literal></entry>
<entry>Waiting for a dynamic shared memory segment to be
allocated.</entry>
</row>
<row>
<entry><literal>DSMFillZeroWrite</literal></entry>
<entry>Waiting to fill a dynamic shared memory backing file with