pgstat_checkpointer.c File Reference

#include "postgres.h"
#include "utils/memutils.h"
#include "utils/pgstat_internal.h"

Include dependency graph for pgstat_checkpointer.c:

Go to the source code of this file.

Macros
#define	CHECKPOINTER_ACC(fld)   stats_shmem->stats.fld += PendingCheckpointerStats.fld
#define	CHECKPOINTER_COMP(fld)   pgStatLocal.snapshot.checkpointer.fld -= reset.fld;

Functions
void	pgstat_report_checkpointer (void)
PgStat_CheckpointerStats *	pgstat_fetch_stat_checkpointer (void)
void	pgstat_checkpointer_init_shmem_cb (void *stats)
void	pgstat_checkpointer_reset_all_cb (TimestampTz ts)
void	pgstat_checkpointer_snapshot_cb (void)

Variables
PgStat_CheckpointerStats	PendingCheckpointerStats = {0}

Macro Definition Documentation

CHECKPOINTER_ACC

#define CHECKPOINTER_ACC

(

fld

)

stats_shmem->stats.fld += PendingCheckpointerStats.fld

CHECKPOINTER_COMP

#define CHECKPOINTER_COMP

(

fld

)

pgStatLocal.snapshot.checkpointer.fld -= reset.fld;

Function Documentation

pgstat_checkpointer_init_shmem_cb()

void pgstat_checkpointer_init_shmem_cb

(

void *

stats

)

Definition at line 89 of file pgstat_checkpointer.c.

{
    PgStatShared_Checkpointer *stats_shmem = (PgStatShared_Checkpointer *) stats;
 
    LWLockInitialize(&stats_shmem->lock, LWTRANCHE_PGSTATS_DATA);
}

References fb(), and LWLockInitialize().

pgstat_checkpointer_reset_all_cb()

void pgstat_checkpointer_reset_all_cb

(

TimestampTz

ts

)

Definition at line 97 of file pgstat_checkpointer.c.

{
    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);
    stats_shmem->stats.stat_reset_timestamp = ts;
    LWLockRelease(&stats_shmem->lock);
}

References PgStat_ShmemControl::checkpointer, fb(), LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), pgstat_copy_changecounted_stats(), pgStatLocal, and PgStat_LocalState::shmem.

pgstat_checkpointer_snapshot_cb()

void pgstat_checkpointer_snapshot_cb

(

void

)

Definition at line 112 of file pgstat_checkpointer.c.

{
    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(num_timed);
    CHECKPOINTER_COMP(num_requested);
    CHECKPOINTER_COMP(num_performed);
    CHECKPOINTER_COMP(restartpoints_timed);
    CHECKPOINTER_COMP(restartpoints_requested);
    CHECKPOINTER_COMP(restartpoints_performed);
    CHECKPOINTER_COMP(write_time);
    CHECKPOINTER_COMP(sync_time);
    CHECKPOINTER_COMP(buffers_written);
    CHECKPOINTER_COMP(slru_written);
#undef CHECKPOINTER_COMP
}

References PgStat_ShmemControl::checkpointer, PgStat_Snapshot::checkpointer, CHECKPOINTER_COMP, fb(), LW_SHARED, LWLockAcquire(), LWLockRelease(), pgstat_copy_changecounted_stats(), pgStatLocal, reset(), PgStat_LocalState::shmem, and PgStat_LocalState::snapshot.

pgstat_fetch_stat_checkpointer()

PgStat_CheckpointerStats * pgstat_fetch_stat_checkpointer

(

void

)

Definition at line 81 of file pgstat_checkpointer.c.

{
    pgstat_snapshot_fixed(PGSTAT_KIND_CHECKPOINTER);
 
    return &pgStatLocal.snapshot.checkpointer;
}

References PgStat_Snapshot::checkpointer, PGSTAT_KIND_CHECKPOINTER, pgstat_snapshot_fixed(), pgStatLocal, and PgStat_LocalState::snapshot.

Referenced by pg_stat_get_checkpointer_buffers_written(), pg_stat_get_checkpointer_num_performed(), pg_stat_get_checkpointer_num_requested(), pg_stat_get_checkpointer_num_timed(), pg_stat_get_checkpointer_restartpoints_performed(), pg_stat_get_checkpointer_restartpoints_requested(), pg_stat_get_checkpointer_restartpoints_timed(), pg_stat_get_checkpointer_slru_written(), pg_stat_get_checkpointer_stat_reset_time(), pg_stat_get_checkpointer_sync_time(), and pg_stat_get_checkpointer_write_time().

pgstat_report_checkpointer()

void pgstat_report_checkpointer

(

void

)

Definition at line 31 of file pgstat_checkpointer.c.

{
    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 (pg_memory_is_all_zeros(&PendingCheckpointerStats,
                               sizeof(struct PgStat_CheckpointerStats)))
        return;
 
    pgstat_begin_changecount_write(&stats_shmem->changecount);
 
#define CHECKPOINTER_ACC(fld) stats_shmem->stats.fld += PendingCheckpointerStats.fld
    CHECKPOINTER_ACC(num_timed);
    CHECKPOINTER_ACC(num_requested);
    CHECKPOINTER_ACC(num_performed);
    CHECKPOINTER_ACC(restartpoints_timed);
    CHECKPOINTER_ACC(restartpoints_requested);
    CHECKPOINTER_ACC(restartpoints_performed);
    CHECKPOINTER_ACC(write_time);
    CHECKPOINTER_ACC(sync_time);
    CHECKPOINTER_ACC(buffers_written);
    CHECKPOINTER_ACC(slru_written);
#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);
}

References Assert, PgStat_ShmemControl::checkpointer, CHECKPOINTER_ACC, fb(), PgStat_ShmemControl::is_shutdown, MemSet, PendingCheckpointerStats, pg_memory_is_all_zeros(), pgstat_assert_is_up, pgstat_begin_changecount_write(), pgstat_end_changecount_write(), pgstat_flush_io(), pgStatLocal, and PgStat_LocalState::shmem.

Referenced by CheckpointerMain(), and CheckpointWriteDelay().

Variable Documentation

PendingCheckpointerStats

PgStat_CheckpointerStats PendingCheckpointerStats = {0}

Definition at line 24 of file pgstat_checkpointer.c.

{0};

Referenced by BufferSync(), CheckpointerMain(), LogCheckpointEnd(), pgstat_report_checkpointer(), and SlruInternalWritePage().