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Commit7bae3bb

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Create a distinct wait event for POSIX DSM allocation.
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
1 parent712704d commit7bae3bb

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4 files changed

+10
-1
lines changed

4 files changed

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‎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
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<entry><literal>CopyFileWrite</literal></entry>
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<entry>Waiting for a write during a file copy operation.</entry>
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</row>
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<row>
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<entry><literal>DSMAllocate</literal></entry>
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<entry>Waiting for a dynamic shared memory segment to be
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allocated.</entry>
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</row>
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<row>
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<entry><literal>DSMFillZeroWrite</literal></entry>
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<entry>Waiting to fill a dynamic shared memory backing file with

‎src/backend/storage/ipc/dsm_impl.c

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@@ -364,7 +364,7 @@ dsm_impl_posix_resize(int fd, off_t size)
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*/
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PG_SETMASK(&BlockSig);
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pgstat_report_wait_start(WAIT_EVENT_DSM_FILL_ZERO_WRITE);
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pgstat_report_wait_start(WAIT_EVENT_DSM_ALLOCATE);
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#if defined(HAVE_POSIX_FALLOCATE)&& defined(__linux__)
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/*
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* On Linux, a shm_open fd is backed by a tmpfs file. If we were to use

‎src/backend/utils/activity/wait_event.c

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@@ -585,6 +585,9 @@ pgstat_get_wait_io(WaitEventIO w)
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caseWAIT_EVENT_DATA_FILE_WRITE:
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event_name="DataFileWrite";
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break;
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caseWAIT_EVENT_DSM_ALLOCATE:
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event_name="DSMAllocate";
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break;
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caseWAIT_EVENT_DSM_FILL_ZERO_WRITE:
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event_name="DSMFillZeroWrite";
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break;

‎src/include/utils/wait_event.h

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@@ -178,6 +178,7 @@ typedef enum
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WAIT_EVENT_DATA_FILE_SYNC,
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WAIT_EVENT_DATA_FILE_TRUNCATE,
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WAIT_EVENT_DATA_FILE_WRITE,
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WAIT_EVENT_DSM_ALLOCATE,
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WAIT_EVENT_DSM_FILL_ZERO_WRITE,
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WAIT_EVENT_LOCK_FILE_ADDTODATADIR_READ,
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WAIT_EVENT_LOCK_FILE_ADDTODATADIR_SYNC,

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