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Introduce pg_stat_checkpointer

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Historically, the statistics of the checkpointer have been always part
of pg_stat_bgwriter.  This commit removes a few columns from
pg_stat_bgwriter, and introduces pg_stat_checkpointer with equivalent,
renamed columns (plus a new one for the reset timestamp):
- checkpoints_timed -> num_timed
- checkpoints_req -> num_requested
- checkpoint_write_time -> write_time
- checkpoint_sync_time -> sync_time
- buffers_checkpoint -> buffers_written

The fields of PgStat_CheckpointerStats and its SQL functions are renamed
to match with the new field names, for consistency.  Note that
background writer and checkpointer have been split into two different
processes in commits 806a2aee37 and bf405ba8e4.  The pgstat
structures were already split, making this change straight-forward.

Bump catalog version.

Author: Bharath Rupireddy
Reviewed-by: Bertrand Drouvot, Andres Freund, Michael Paquier
Discussion: https://postgr.es/m/CALj2ACVxX2ii=66RypXRweZe2EsBRiPMj0aHfRfHUeXJcC7kHg@mail.gmail.com
This commit is contained in:
Michael Paquier
2023-10-30 09:47:16 +09:00
parent bf01e1ba96
commit 96f052613f
14 changed files with 215 additions and 123 deletions
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21
src/backend/utils/activity/pgstat_checkpointer.c
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@ -47,11 +47,11 @@ pgstat_report_checkpointer(void)
pgstat_begin_changecount_write(&stats_shmem->changecount);
#define CHECKPOINTER_ACC(fld) stats_shmem->stats.fld += PendingCheckpointerStats.fld
CHECKPOINTER_ACC(timed_checkpoints);
CHECKPOINTER_ACC(requested_checkpoints);
CHECKPOINTER_ACC(checkpoint_write_time);
CHECKPOINTER_ACC(checkpoint_sync_time);
CHECKPOINTER_ACC(buf_written_checkpoints);
CHECKPOINTER_ACC(num_timed);
CHECKPOINTER_ACC(num_requested);
CHECKPOINTER_ACC(write_time);
CHECKPOINTER_ACC(sync_time);
CHECKPOINTER_ACC(buffers_written);
#undef CHECKPOINTER_ACC
pgstat_end_changecount_write(&stats_shmem->changecount);
@ -92,6 +92,7 @@ pgstat_checkpointer_reset_all_cb(TimestampTz ts)
&stats_shmem->stats,
sizeof(stats_shmem->stats),
&stats_shmem->changecount);
stats_shmem->stats.stat_reset_timestamp = ts;
LWLockRelease(&stats_shmem->lock);
}
@ -113,10 +114,10 @@ pgstat_checkpointer_snapshot_cb(void)
/* compensate by reset offsets */
#define CHECKPOINTER_COMP(fld) pgStatLocal.snapshot.checkpointer.fld -= reset.fld;
CHECKPOINTER_COMP(timed_checkpoints);
CHECKPOINTER_COMP(requested_checkpoints);
CHECKPOINTER_COMP(checkpoint_write_time);
CHECKPOINTER_COMP(checkpoint_sync_time);
CHECKPOINTER_COMP(buf_written_checkpoints);
CHECKPOINTER_COMP(num_timed);
CHECKPOINTER_COMP(num_requested);
CHECKPOINTER_COMP(write_time);
CHECKPOINTER_COMP(sync_time);
CHECKPOINTER_COMP(buffers_written);
#undef CHECKPOINTER_COMP
}