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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
Download Patch File Download Diff File Expand all files Collapse all files

233
src/backend/postmaster/pgstat.c
View File

@@ -280,6 +280,7 @@ static const char *pgstat_get_wait_activity(WaitEventActivity w);
static const char *pgstat_get_wait_client(WaitEventClient w);
static const char *pgstat_get_wait_ipc(WaitEventIPC w);
static const char *pgstat_get_wait_timeout(WaitEventTimeout w);
static const char *pgstat_get_wait_io(WaitEventIO w);
static void pgstat_setheader(PgStat_MsgHdr *hdr, StatMsgType mtype);
static void pgstat_send(void *msg, int len);
@@ -3176,6 +3177,9 @@ pgstat_get_wait_event_type(uint32 wait_event_info)
case PG_WAIT_TIMEOUT:
event_type = "Timeout";
break;
case PG_WAIT_IO:
event_type = "IO";
break;
default:
event_type = "???";
break;
@@ -3246,6 +3250,13 @@ pgstat_get_wait_event(uint32 wait_event_info)
event_name = pgstat_get_wait_timeout(w);
break;
}
case PG_WAIT_IO:
{
WaitEventIO w = (WaitEventIO) wait_event_info;
event_name = pgstat_get_wait_io(w);
break;
}
default:
event_name = "unknown wait event";
break;
@@ -3438,6 +3449,228 @@ pgstat_get_wait_timeout(WaitEventTimeout w)
return event_name;
}
/* ----------
* pgstat_get_wait_io() -
*
* Convert WaitEventIO to string.
* ----------
*/
static const char *
pgstat_get_wait_io(WaitEventIO w)
{
const char *event_name = "unknown wait event";
switch (w)
{
case WAIT_EVENT_BUFFILE_READ:
event_name = "BufFileRead";
break;
case WAIT_EVENT_BUFFILE_WRITE:
event_name = "BufFileWrite";
break;
case WAIT_EVENT_CONTROL_FILE_READ:
event_name = "ControlFileRead";
break;
case WAIT_EVENT_CONTROL_FILE_SYNC:
event_name = "ControlFileSync";
break;
case WAIT_EVENT_CONTROL_FILE_SYNC_UPDATE:
event_name = "ControlFileSyncUpdate";
break;
case WAIT_EVENT_CONTROL_FILE_WRITE:
event_name = "ControlFileWrite";
break;
case WAIT_EVENT_CONTROL_FILE_WRITE_UPDATE:
event_name = "ControlFileWriteUpdate";
break;
case WAIT_EVENT_COPY_FILE_READ:
event_name = "CopyFileRead";
break;
case WAIT_EVENT_COPY_FILE_WRITE:
event_name = "CopyFileWrite";
break;
case WAIT_EVENT_DATA_FILE_EXTEND:
event_name = "DataFileExtend";
break;
case WAIT_EVENT_DATA_FILE_FLUSH:
event_name = "DataFileFlush";
break;
case WAIT_EVENT_DATA_FILE_IMMEDIATE_SYNC:
event_name = "DataFileImmediateSync";
break;
case WAIT_EVENT_DATA_FILE_PREFETCH:
event_name = "DataFilePrefetch";
break;
case WAIT_EVENT_DATA_FILE_READ:
event_name = "DataFileRead";
break;
case WAIT_EVENT_DATA_FILE_SYNC:
event_name = "DataFileSync";
break;
case WAIT_EVENT_DATA_FILE_TRUNCATE:
event_name = "DataFileTruncate";
break;
case WAIT_EVENT_DATA_FILE_WRITE:
event_name = "DataFileWrite";
break;
case WAIT_EVENT_DSM_FILL_ZERO_WRITE:
event_name = "DSMFillZeroWrite";
break;
case WAIT_EVENT_LOCK_FILE_ADDTODATADIR_READ:
event_name = "LockFileAddToDataDirRead";
break;
case WAIT_EVENT_LOCK_FILE_ADDTODATADIR_SYNC:
event_name = "LockFileAddToDataDirSync";
break;
case WAIT_EVENT_LOCK_FILE_ADDTODATADIR_WRITE:
event_name = "LockFileAddToDataDirWrite";
break;
case WAIT_EVENT_LOCK_FILE_CREATE_READ:
event_name = "LockFileCreateRead";
break;
case WAIT_EVENT_LOCK_FILE_CREATE_SYNC:
event_name = "LockFileCreateSync";
break;
case WAIT_EVENT_LOCK_FILE_CREATE_WRITE:
event_name = "LockFileCreateWRITE";
break;
case WAIT_EVENT_LOCK_FILE_RECHECKDATADIR_READ:
event_name = "LockFileReCheckDataDirRead";
break;
case WAIT_EVENT_LOGICAL_REWRITE_CHECKPOINT_SYNC:
event_name = "LogicalRewriteCheckpointSync";
break;
case WAIT_EVENT_LOGICAL_REWRITE_MAPPING_SYNC:
event_name = "LogicalRewriteMappingSync";
break;
case WAIT_EVENT_LOGICAL_REWRITE_MAPPING_WRITE:
event_name = "LogicalRewriteMappingWrite";
break;
case WAIT_EVENT_LOGICAL_REWRITE_SYNC:
event_name = "LogicalRewriteSync";
break;
case WAIT_EVENT_LOGICAL_REWRITE_TRUNCATE:
event_name = "LogicalRewriteTruncate";
break;
case WAIT_EVENT_LOGICAL_REWRITE_WRITE:
event_name = "LogicalRewriteWrite";
break;
case WAIT_EVENT_RELATION_MAP_READ:
event_name = "RelationMapRead";
break;
case WAIT_EVENT_RELATION_MAP_SYNC:
event_name = "RelationMapSync";
break;
case WAIT_EVENT_RELATION_MAP_WRITE:
event_name = "RelationMapWrite";
break;
case WAIT_EVENT_REORDER_BUFFER_READ:
event_name = "ReorderBufferRead";
break;
case WAIT_EVENT_REORDER_BUFFER_WRITE:
event_name = "ReorderBufferWrite";
break;
case WAIT_EVENT_REORDER_LOGICAL_MAPPING_READ:
event_name = "ReorderLogicalMappingRead";
break;
case WAIT_EVENT_REPLICATION_SLOT_READ:
event_name = "ReplicationSlotRead";
break;
case WAIT_EVENT_REPLICATION_SLOT_RESTORE_SYNC:
event_name = "ReplicationSlotRestoreSync";
break;
case WAIT_EVENT_REPLICATION_SLOT_SYNC:
event_name = "ReplicationSlotSync";
break;
case WAIT_EVENT_REPLICATION_SLOT_WRITE:
event_name = "ReplicationSlotWrite";
break;
case WAIT_EVENT_SLRU_FLUSH_SYNC:
event_name = "SLRUFlushSync";
break;
case WAIT_EVENT_SLRU_READ:
event_name = "SLRURead";
break;
case WAIT_EVENT_SLRU_SYNC:
event_name = "SLRUSync";
break;
case WAIT_EVENT_SLRU_WRITE:
event_name = "SLRUWrite";
break;
case WAIT_EVENT_SNAPBUILD_READ:
event_name = "SnapbuildRead";
break;
case WAIT_EVENT_SNAPBUILD_SYNC:
event_name = "SnapbuildSync";
break;
case WAIT_EVENT_SNAPBUILD_WRITE:
event_name = "SnapbuildWrite";
break;
case WAIT_EVENT_TIMELINE_HISTORY_FILE_SYNC:
event_name = "TimelineHistoryFileSync";
break;
case WAIT_EVENT_TIMELINE_HISTORY_FILE_WRITE:
event_name = "TimelineHistoryFileWrite";
break;
case WAIT_EVENT_TIMELINE_HISTORY_READ:
event_name = "TimelineHistoryRead";
break;
case WAIT_EVENT_TIMELINE_HISTORY_SYNC:
event_name = "TimelineHistorySync";
break;
case WAIT_EVENT_TIMELINE_HISTORY_WRITE:
event_name = "TimelineHistoryWrite";
break;
case WAIT_EVENT_TWOPHASE_FILE_READ:
event_name = "TwophaseFileRead";
break;
case WAIT_EVENT_TWOPHASE_FILE_SYNC:
event_name = "TwophaseFileSync";
break;
case WAIT_EVENT_TWOPHASE_FILE_WRITE:
event_name = "TwophaseFileWrite";
break;
case WAIT_EVENT_WALSENDER_TIMELINE_HISTORY_READ:
event_name = "WALSenderTimelineHistoryRead";
break;
case WAIT_EVENT_WAL_BOOTSTRAP_SYNC:
event_name = "WALBootstrapSync";
break;
case WAIT_EVENT_WAL_BOOTSTRAP_WRITE:
event_name = "WALBootstrapWrite";
break;
case WAIT_EVENT_WAL_COPY_READ:
event_name = "WALCopyRead";
break;
case WAIT_EVENT_WAL_COPY_SYNC:
event_name = "WALCopySync";
break;
case WAIT_EVENT_WAL_COPY_WRITE:
event_name = "WALCopyWrite";
break;
case WAIT_EVENT_WAL_INIT_SYNC:
event_name = "WALInitSync";
break;
case WAIT_EVENT_WAL_INIT_WRITE:
event_name = "WALInitWrite";
break;
case WAIT_EVENT_WAL_READ:
event_name = "WALRead";
break;
case WAIT_EVENT_WAL_SYNC_METHOD_ASSIGN:
event_name = "WALSyncMethodAssign";
break;
case WAIT_EVENT_WAL_WRITE:
event_name = "WALWrite";
break;
/* no default case, so that compiler will warn */
}
return event_name;
}
/* ----------
* pgstat_get_backend_current_activity() -
*