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Publish checkpoint timing information to pg_stat_bgwriter.

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Greg Smith, Peter Geoghegan, and Robert Haas
This commit is contained in:
Robert Haas
2012-04-05 14:03:21 -04:00
parent a75b08066a
commit b736aef2ec
10 changed files with 81 additions and 26 deletions
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25
src/backend/storage/smgr/md.c
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@@ -1094,27 +1094,22 @@ mdsync(void)
entry->tag.segno * ((BlockNumber) RELSEG_SIZE),
false, EXTENSION_RETURN_NULL);
if (log_checkpoints)
INSTR_TIME_SET_CURRENT(sync_start);
else
INSTR_TIME_SET_ZERO(sync_start);
INSTR_TIME_SET_CURRENT(sync_start);
if (seg != NULL &&
FileSync(seg->mdfd_vfd) >= 0)
{
if (log_checkpoints && (!INSTR_TIME_IS_ZERO(sync_start)))
{
INSTR_TIME_SET_CURRENT(sync_end);
sync_diff = sync_end;
INSTR_TIME_SUBTRACT(sync_diff, sync_start);
elapsed = INSTR_TIME_GET_MICROSEC(sync_diff);
if (elapsed > longest)
longest = elapsed;
total_elapsed += elapsed;
processed++;
INSTR_TIME_SET_CURRENT(sync_end);
sync_diff = sync_end;
INSTR_TIME_SUBTRACT(sync_diff, sync_start);
elapsed = INSTR_TIME_GET_MICROSEC(sync_diff);
if (elapsed > longest)
longest = elapsed;
total_elapsed += elapsed;
processed++;
if (log_checkpoints)
elog(DEBUG1, "checkpoint sync: number=%d file=%s time=%.3f msec",
processed, FilePathName(seg->mdfd_vfd), (double) elapsed / 1000);
}
break; /* success; break out of retry loop */
}