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

Include dependency graph for pgstat_bgwriter.c:

Macros
#define	BGWRITER_ACC(fld) stats_shmem->stats.fld += PendingBgWriterStats.fld

#define	BGWRITER_COMP(fld) pgStatLocal.snapshot.bgwriter.fld -= reset.fld;

Functions
void	pgstat_report_bgwriter (void)

PgStat_BgWriterStats *	pgstat_fetch_stat_bgwriter (void)

void	pgstat_bgwriter_reset_all_cb (TimestampTz ts)

void	pgstat_bgwriter_snapshot_cb (void)

Variables
PgStat_BgWriterStats	PendingBgWriterStats = {0}

Macro Definition Documentation

◆ BGWRITER_ACC

#define BGWRITER_ACC ( fld ) stats_shmem->stats.fld += PendingBgWriterStats.fld

◆ BGWRITER_COMP

#define BGWRITER_COMP ( fld ) pgStatLocal.snapshot.bgwriter.fld -= reset.fld;

Function Documentation

◆ pgstat_bgwriter_reset_all_cb()

void pgstat_bgwriter_reset_all_cb ( TimestampTz ts )

Definition at line 79 of file pgstat_bgwriter.c.

 {
     PgStatShared_BgWriter *stats_shmem = &pgStatLocal.shmem->bgwriter;
  
     /* see explanation above PgStatShared_BgWriter 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::bgwriter, PgStatShared_BgWriter::changecount, PgStatShared_BgWriter::lock, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), pgstat_copy_changecounted_stats(), pgStatLocal, PgStatShared_BgWriter::reset_offset, PgStat_LocalState::shmem, PgStat_BgWriterStats::stat_reset_timestamp, and PgStatShared_BgWriter::stats.

◆ pgstat_bgwriter_snapshot_cb()

void pgstat_bgwriter_snapshot_cb ( void )

Definition at line 94 of file pgstat_bgwriter.c.

 {
     PgStatShared_BgWriter *stats_shmem = &pgStatLocal.shmem->bgwriter;
     PgStat_BgWriterStats *reset_offset = &stats_shmem->reset_offset;
     PgStat_BgWriterStats reset;
  
     pgstat_copy_changecounted_stats(&pgStatLocal.snapshot.bgwriter,
                                     &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 BGWRITER_COMP(fld) pgStatLocal.snapshot.bgwriter.fld -= reset.fld;
     BGWRITER_COMP(buf_written_clean);
     BGWRITER_COMP(maxwritten_clean);
     BGWRITER_COMP(buf_alloc);
 #undef BGWRITER_COMP
 }

References PgStat_ShmemControl::bgwriter, PgStat_Snapshot::bgwriter, BGWRITER_COMP, PgStatShared_BgWriter::changecount, PgStatShared_BgWriter::lock, LW_SHARED, LWLockAcquire(), LWLockRelease(), pgstat_copy_changecounted_stats(), pgStatLocal, reset(), PgStatShared_BgWriter::reset_offset, PgStat_LocalState::shmem, PgStat_LocalState::snapshot, and PgStatShared_BgWriter::stats.

◆ pgstat_fetch_stat_bgwriter()

PgStat_BgWriterStats* pgstat_fetch_stat_bgwriter ( void )

Definition at line 71 of file pgstat_bgwriter.c.

 {
     pgstat_snapshot_fixed(PGSTAT_KIND_BGWRITER);
  
     return &pgStatLocal.snapshot.bgwriter;
 }

References PgStat_Snapshot::bgwriter, PGSTAT_KIND_BGWRITER, pgstat_snapshot_fixed(), pgStatLocal, and PgStat_LocalState::snapshot.

Referenced by pg_stat_get_bgwriter_buf_written_clean(), pg_stat_get_bgwriter_maxwritten_clean(), pg_stat_get_bgwriter_stat_reset_time(), and pg_stat_get_buf_alloc().

◆ pgstat_report_bgwriter()

void pgstat_report_bgwriter ( void )

Definition at line 30 of file pgstat_bgwriter.c.

 {
     PgStatShared_BgWriter *stats_shmem = &pgStatLocal.shmem->bgwriter;
     static const PgStat_BgWriterStats all_zeroes;
  
     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(&PendingBgWriterStats, &all_zeroes, sizeof(all_zeroes)) == 0)
         return;
  
     pgstat_begin_changecount_write(&stats_shmem->changecount);
  
 #define BGWRITER_ACC(fld) stats_shmem->stats.fld += PendingBgWriterStats.fld
     BGWRITER_ACC(buf_written_clean);
     BGWRITER_ACC(maxwritten_clean);
     BGWRITER_ACC(buf_alloc);
 #undef BGWRITER_ACC
  
     pgstat_end_changecount_write(&stats_shmem->changecount);
  
     /*
      * Clear out the statistics buffer, so it can be re-used.
      */
     MemSet(&PendingBgWriterStats, 0, sizeof(PendingBgWriterStats));
  
     /*
      * Report IO statistics
      */
     pgstat_flush_io(false);
 }