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/* -------------------------------------------------------------------------
*
* 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) 2001-2022, 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 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));
}
/*
* 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
}
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