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Add ProcArrayGroupUpdate wait event.

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Discussion: http://postgr.es/m/CA+TgmobgWHcXDcChX2+BqJDk2dkPVF85ZrJFhUyHHQmw8diTpA@mail.gmail.com
This commit is contained in:
Robert Haas 2017-04-07 13:41:47 -04:00
parent dbb2a93147
commit d4116a7719
4 changed files with 11 additions and 1 deletions
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5
doc/src/sgml/monitoring.sgml
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@ -1232,7 +1232,7 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<entry>Waiting in an extension.</entry>
</row>
<row>
<entry morerows="11"><literal>IPC</></entry>
<entry morerows="12"><literal>IPC</></entry>
<entry><literal>BgWorkerShutdown</></entry>
<entry>Waiting for background worker to shut down.</entry>
</row>
@ -1272,6 +1272,9 @@ postgres 27093 0.0 0.0 30096 2752 ? Ss 11:34 0:00 postgres: ser
<entry><literal>ParallelBitmapPopulate</></entry>
<entry>Waiting for the leader to populate the TidBitmap.</entry>
</row>
<row>
<entry><literal>ProcArrayGroupUpdate</></entry>
<entry>Waiting for group leader to clear transaction id at transaction end.</entry>
<row>
<entry><literal>SafeSnapshot</></entry>
<entry>Waiting for a snapshot for a <literal>READ ONLY DEFERRABLE</> transaction.</entry>

3
src/backend/postmaster/pgstat.c
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@ -3560,6 +3560,9 @@ pgstat_get_wait_ipc(WaitEventIPC w)
case WAIT_EVENT_PARALLEL_BITMAP_SCAN:
event_name = "ParallelBitmapScan";
break;
case WAIT_EVENT_PROCARRAY_GROUP_UPDATE:
event_name = "ProcArrayGroupUpdate";
break;
case WAIT_EVENT_SAFE_SNAPSHOT:
event_name = "SafeSnapshot";
break;

3
src/backend/storage/ipc/procarray.c
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@ -53,6 +53,7 @@
#include "access/xlog.h"
#include "catalog/catalog.h"
#include "miscadmin.h"
#include "pgstat.h"
#include "storage/proc.h"
#include "storage/procarray.h"
#include "storage/spin.h"
@ -513,6 +514,7 @@ ProcArrayGroupClearXid(PGPROC *proc, TransactionId latestXid)
int extraWaits = 0;
/* Sleep until the leader clears our XID. */
pgstat_report_wait_start(WAIT_EVENT_PROCARRAY_GROUP_UPDATE);
for (;;)
{
/* acts as a read barrier */
@ -521,6 +523,7 @@ ProcArrayGroupClearXid(PGPROC *proc, TransactionId latestXid)
break;
extraWaits++;
}
pgstat_report_wait_end();
Assert(pg_atomic_read_u32(&proc->procArrayGroupNext) == INVALID_PGPROCNO);

1
src/include/pgstat.h
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@ -808,6 +808,7 @@ typedef enum
WAIT_EVENT_MQ_SEND,
WAIT_EVENT_PARALLEL_FINISH,
WAIT_EVENT_PARALLEL_BITMAP_SCAN,
WAIT_EVENT_PROCARRAY_GROUP_UPDATE,
WAIT_EVENT_SAFE_SNAPSHOT,
WAIT_EVENT_SYNC_REP,
WAIT_EVENT_LOGICAL_SYNC_DATA,