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

Browse Source 
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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3
src/backend/storage/ipc/dsm_impl.c
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@ -60,6 +60,7 @@
#ifdef HAVE_SYS_SHM_H
#include <sys/shm.h>
#endif
#include "pgstat.h"
#include "portability/mem.h"
#include "storage/dsm_impl.h"
@ -911,10 +912,12 @@ dsm_impl_mmap(dsm_op op, dsm_handle handle, Size request_size,
if (goal > ZBUFFER_SIZE)
goal = ZBUFFER_SIZE;
pgstat_report_wait_start(WAIT_EVENT_DSM_FILL_ZERO_WRITE);
if (write(fd, zbuffer, goal) == goal)
remaining -= goal;
else
success = false;
pgstat_report_wait_end();
}
if (!success)