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Create and use wait events for read, write, and fsync operations.

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Previous commits, notably 53be0b1add and
6f3bd98ebf, made it possible to see from
pg_stat_activity when a backend was stuck waiting for another backend,
but it's also fairly common for a backend to be stuck waiting for an
I/O.  Add wait events for those operations, too.

Rushabh Lathia, with further hacking by me.  Reviewed and tested by
Michael Paquier, Amit Kapila, Rajkumar Raghuwanshi, and Rahila Syed.

Discussion: http://postgr.es/m/CAGPqQf0LsYHXREPAZqYGVkDqHSyjf=KsD=k0GTVPAuzyThh-VQ@mail.gmail.com
This commit is contained in:
Robert Haas
2017-03-18 07:43:01 -04:00
parent 928250aef5
commit 249cf070e3
21 changed files with 782 additions and 29 deletions
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4
src/backend/replication/walsender.c
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@@ -463,7 +463,9 @@ SendTimeLineHistory(TimeLineHistoryCmd *cmd)
char rbuf[BLCKSZ];
int nread;
pgstat_report_wait_start(WAIT_EVENT_WALSENDER_TIMELINE_HISTORY_READ);
nread = read(fd, rbuf, sizeof(rbuf));
pgstat_report_wait_end();
if (nread <= 0)
ereport(ERROR,
(errcode_for_file_access(),
@@ -2126,7 +2128,9 @@ retry:
else
segbytes = nbytes;
pgstat_report_wait_start(WAIT_EVENT_WAL_READ);
readbytes = read(sendFile, p, segbytes);
pgstat_report_wait_end();
if (readbytes <= 0)
{
ereport(ERROR,