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pgstat: split reporting/fetching of bgwriter and checkpointer stats.

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These have been unrelated since bgwriter and checkpointer were split into two
processes in 806a2aee37. As there several pending patches (shared memory
stats, extending the set of tracked IO / buffer statistics) that are made a
bit more awkward by the grouping, split them. Done separately to make
reviewing easier.

This does *not* change the contents of pg_stat_bgwriter or move fields out of
bgwriter/checkpointer stats that arguably do not belong in either. However
pgstat_fetch_global() was renamed and split into
pgstat_fetch_stat_checkpointer() and pgstat_fetch_stat_bgwriter().

Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20210405092914.mmxqe7j56lsjfsej@alap3.anarazel.de
This commit is contained in:
Andres Freund
2021-08-04 19:16:04 -07:00
parent cc8033e1da
commit 1bc8e7b099
6 changed files with 185 additions and 67 deletions
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26
src/backend/postmaster/checkpointer.c
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@ -357,7 +357,7 @@ CheckpointerMain(void)
if (((volatile CheckpointerShmemStruct *) CheckpointerShmem)->ckpt_flags)
{
do_checkpoint = true;
BgWriterStats.m_requested_checkpoints++;
PendingCheckpointerStats.m_requested_checkpoints++;
}
/*
@ -371,7 +371,7 @@ CheckpointerMain(void)
if (elapsed_secs >= CheckPointTimeout)
{
if (!do_checkpoint)
BgWriterStats.m_timed_checkpoints++;
PendingCheckpointerStats.m_timed_checkpoints++;
do_checkpoint = true;
flags |= CHECKPOINT_CAUSE_TIME;
}
@ -493,13 +493,9 @@ CheckpointerMain(void)
CheckArchiveTimeout();
/*
* Send off activity statistics to the stats collector. (The reason
* why we re-use bgwriter-related code for this is that the bgwriter
* and checkpointer used to be just one process. It's probably not
* worth the trouble to split the stats support into two independent
* stats message types.)
* Send off activity statistics to the stats collector.
*/
pgstat_send_bgwriter();
pgstat_send_checkpointer();
/* Send WAL statistics to the stats collector. */
pgstat_send_wal(true);
@ -577,9 +573,9 @@ HandleCheckpointerInterrupts(void)
* updates the statistics, increment the checkpoint request and send
* the statistics to the stats collector.
*/
BgWriterStats.m_requested_checkpoints++;
PendingCheckpointerStats.m_requested_checkpoints++;
ShutdownXLOG(0, 0);
pgstat_send_bgwriter();
pgstat_send_checkpointer();
pgstat_send_wal(true);
/* Normal exit from the checkpointer is here */
@ -719,9 +715,9 @@ CheckpointWriteDelay(int flags, double progress)
CheckArchiveTimeout();
/*
* Report interim activity statistics to the stats collector.
* Report interim activity statistics.
*/
pgstat_send_bgwriter();
pgstat_send_checkpointer();
/*
* This sleep used to be connected to bgwriter_delay, typically 200ms.
@ -1265,8 +1261,10 @@ AbsorbSyncRequests(void)
LWLockAcquire(CheckpointerCommLock, LW_EXCLUSIVE);
/* Transfer stats counts into pending pgstats message */
BgWriterStats.m_buf_written_backend += CheckpointerShmem->num_backend_writes;
BgWriterStats.m_buf_fsync_backend += CheckpointerShmem->num_backend_fsync;
PendingCheckpointerStats.m_buf_written_backend
+= CheckpointerShmem->num_backend_writes;
PendingCheckpointerStats.m_buf_fsync_backend
+= CheckpointerShmem->num_backend_fsync;
CheckpointerShmem->num_backend_writes = 0;
CheckpointerShmem->num_backend_fsync = 0;