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