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96f052613f
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 806a2aee3791 and bf405ba8e460. 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
124 lines
3.5 KiB
C
124 lines
3.5 KiB
C
/* -------------------------------------------------------------------------
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*
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* pgstat_checkpointer.c
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* Implementation of checkpoint statistics.
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*
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* This file contains the implementation of checkpoint statistics. It is kept
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* separate from pgstat.c to enforce the line between the statistics access /
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* storage implementation and the details about individual types of
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* statistics.
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*
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* Copyright (c) 2001-2023, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/backend/utils/activity/pgstat_checkpointer.c
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* -------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "utils/pgstat_internal.h"
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PgStat_CheckpointerStats PendingCheckpointerStats = {0};
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/*
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* Report checkpointer and IO statistics
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*/
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void
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pgstat_report_checkpointer(void)
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{
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/* We assume this initializes to zeroes */
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static const PgStat_CheckpointerStats all_zeroes;
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PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer;
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Assert(!pgStatLocal.shmem->is_shutdown);
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pgstat_assert_is_up();
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/*
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* This function can be called even if nothing at all has happened. In
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* this case, avoid unnecessarily modifying the stats entry.
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*/
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if (memcmp(&PendingCheckpointerStats, &all_zeroes,
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sizeof(all_zeroes)) == 0)
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return;
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pgstat_begin_changecount_write(&stats_shmem->changecount);
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#define CHECKPOINTER_ACC(fld) stats_shmem->stats.fld += PendingCheckpointerStats.fld
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CHECKPOINTER_ACC(num_timed);
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CHECKPOINTER_ACC(num_requested);
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CHECKPOINTER_ACC(write_time);
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CHECKPOINTER_ACC(sync_time);
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CHECKPOINTER_ACC(buffers_written);
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#undef CHECKPOINTER_ACC
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pgstat_end_changecount_write(&stats_shmem->changecount);
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/*
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* Clear out the statistics buffer, so it can be re-used.
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*/
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MemSet(&PendingCheckpointerStats, 0, sizeof(PendingCheckpointerStats));
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/*
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* Report IO statistics
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*/
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pgstat_flush_io(false);
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}
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/*
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* pgstat_fetch_stat_checkpointer() -
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*
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* Support function for the SQL-callable pgstat* functions. Returns
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* a pointer to the checkpointer statistics struct.
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*/
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PgStat_CheckpointerStats *
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pgstat_fetch_stat_checkpointer(void)
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{
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pgstat_snapshot_fixed(PGSTAT_KIND_CHECKPOINTER);
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return &pgStatLocal.snapshot.checkpointer;
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}
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void
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pgstat_checkpointer_reset_all_cb(TimestampTz ts)
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{
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PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer;
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/* see explanation above PgStatShared_Checkpointer for the reset protocol */
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LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE);
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pgstat_copy_changecounted_stats(&stats_shmem->reset_offset,
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&stats_shmem->stats,
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sizeof(stats_shmem->stats),
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&stats_shmem->changecount);
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stats_shmem->stats.stat_reset_timestamp = ts;
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LWLockRelease(&stats_shmem->lock);
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}
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void
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pgstat_checkpointer_snapshot_cb(void)
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{
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PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer;
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PgStat_CheckpointerStats *reset_offset = &stats_shmem->reset_offset;
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PgStat_CheckpointerStats reset;
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pgstat_copy_changecounted_stats(&pgStatLocal.snapshot.checkpointer,
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&stats_shmem->stats,
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sizeof(stats_shmem->stats),
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&stats_shmem->changecount);
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LWLockAcquire(&stats_shmem->lock, LW_SHARED);
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memcpy(&reset, reset_offset, sizeof(stats_shmem->stats));
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LWLockRelease(&stats_shmem->lock);
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/* compensate by reset offsets */
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#define CHECKPOINTER_COMP(fld) pgStatLocal.snapshot.checkpointer.fld -= reset.fld;
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CHECKPOINTER_COMP(num_timed);
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CHECKPOINTER_COMP(num_requested);
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CHECKPOINTER_COMP(write_time);
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CHECKPOINTER_COMP(sync_time);
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CHECKPOINTER_COMP(buffers_written);
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#undef CHECKPOINTER_COMP
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}
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