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21471f18e9
This new callback gives fixed-numbered stats the possibility to take
actions based on the area of shared memory allocated for them.
This removes from pgstat_shmem.c any knowledge specific to the types
of fixed-numbered stats, and the initializations happen in their own
files. Like b68b29bc8f, this change is useful to make this area of
the code more pluggable, so as custom fixed-numbered stats can take
actions after their shared memory area is initialized.
Reviewed-by: Bertrand Drouvot
Discussion: https://postgr.es/m/Zot5bxoPYdS7yaoy@paquier.xyz
138 lines
4.0 KiB
C
138 lines
4.0 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) 2001-2024, 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(restartpoints_timed);
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CHECKPOINTER_ACC(restartpoints_requested);
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CHECKPOINTER_ACC(restartpoints_performed);
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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_init_shmem_cb(void *stats)
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{
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PgStatShared_Checkpointer *stats_shmem = (PgStatShared_Checkpointer *) stats;
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LWLockInitialize(&stats_shmem->lock, LWTRANCHE_PGSTATS_DATA);
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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(restartpoints_timed);
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CHECKPOINTER_COMP(restartpoints_requested);
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CHECKPOINTER_COMP(restartpoints_performed);
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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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