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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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11
src/backend/storage/file/buffile.c
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@@ -37,6 +37,7 @@
#include "postgres.h"
#include "executor/instrument.h"
#include "pgstat.h"
#include "storage/fd.h"
#include "storage/buffile.h"
#include "storage/buf_internals.h"
@@ -254,7 +255,10 @@ BufFileLoadBuffer(BufFile *file)
/*
* Read whatever we can get, up to a full bufferload.
*/
file->nbytes = FileRead(thisfile, file->buffer, sizeof(file->buffer));
file->nbytes = FileRead(thisfile,
file->buffer,
sizeof(file->buffer),
WAIT_EVENT_BUFFILE_READ);
if (file->nbytes < 0)
file->nbytes = 0;
file->offsets[file->curFile] += file->nbytes;
@@ -317,7 +321,10 @@ BufFileDumpBuffer(BufFile *file)
return; /* seek failed, give up */
file->offsets[file->curFile] = file->curOffset;
}
bytestowrite = FileWrite(thisfile, file->buffer + wpos, bytestowrite);
bytestowrite = FileWrite(thisfile,
file->buffer + wpos,
bytestowrite,
WAIT_EVENT_BUFFILE_WRITE);
if (bytestowrite <= 0)
return; /* failed to write */
file->offsets[file->curFile] += bytestowrite;