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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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4
src/backend/access/transam/xlog.c
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@ -8721,8 +8721,8 @@ LogCheckpointEnd(bool restartpoint)
CheckpointStats.ckpt_sync_end_t);
/* Accumulate checkpoint timing summary data, in milliseconds. */
BgWriterStats.m_checkpoint_write_time += write_msecs;
BgWriterStats.m_checkpoint_sync_time += sync_msecs;
PendingCheckpointerStats.m_checkpoint_write_time += write_msecs;
PendingCheckpointerStats.m_checkpoint_sync_time += sync_msecs;
/*
* All of the published timing statistics are accounted for. Only