PostgreSQL Source Code  git master
pgstat_checkpointer.c File Reference
#include "postgres.h"
#include "utils/pgstat_internal.h"
Include dependency graph for pgstat_checkpointer.c:

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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_CheckpointerStatspgstat_fetch_stat_checkpointer (void)
 
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_reset_all_cb()

void pgstat_checkpointer_reset_all_cb ( TimestampTz  ts)

Definition at line 88 of file pgstat_checkpointer.c.

89 {
91 
92  /* see explanation above PgStatShared_Checkpointer for the reset protocol */
93  LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE);
95  &stats_shmem->stats,
96  sizeof(stats_shmem->stats),
97  &stats_shmem->changecount);
98  stats_shmem->stats.stat_reset_timestamp = ts;
99  LWLockRelease(&stats_shmem->lock);
100 }
bool LWLockAcquire(LWLock *lock, LWLockMode mode)
Definition: lwlock.c:1169
void LWLockRelease(LWLock *lock)
Definition: lwlock.c:1782
@ LW_EXCLUSIVE
Definition: lwlock.h:114
PgStat_LocalState pgStatLocal
Definition: pgstat.c:193
static void pgstat_copy_changecounted_stats(void *dst, void *src, size_t len, uint32 *cc)
PgStat_CheckpointerStats reset_offset
PgStat_CheckpointerStats stats
TimestampTz stat_reset_timestamp
Definition: pgstat.h:271
PgStat_ShmemControl * shmem
PgStatShared_Checkpointer checkpointer

References PgStatShared_Checkpointer::changecount, PgStat_ShmemControl::checkpointer, PgStatShared_Checkpointer::lock, LW_EXCLUSIVE, LWLockAcquire(), LWLockRelease(), pgstat_copy_changecounted_stats(), pgStatLocal, PgStatShared_Checkpointer::reset_offset, PgStat_LocalState::shmem, PgStat_CheckpointerStats::stat_reset_timestamp, and PgStatShared_Checkpointer::stats.

◆ pgstat_checkpointer_snapshot_cb()

void pgstat_checkpointer_snapshot_cb ( void  )

Definition at line 103 of file pgstat_checkpointer.c.

104 {
106  PgStat_CheckpointerStats *reset_offset = &stats_shmem->reset_offset;
108 
110  &stats_shmem->stats,
111  sizeof(stats_shmem->stats),
112  &stats_shmem->changecount);
113 
114  LWLockAcquire(&stats_shmem->lock, LW_SHARED);
115  memcpy(&reset, reset_offset, sizeof(stats_shmem->stats));
116  LWLockRelease(&stats_shmem->lock);
117 
118  /* compensate by reset offsets */
119 #define CHECKPOINTER_COMP(fld) pgStatLocal.snapshot.checkpointer.fld -= reset.fld;
120  CHECKPOINTER_COMP(num_timed);
121  CHECKPOINTER_COMP(num_requested);
122  CHECKPOINTER_COMP(restartpoints_timed);
123  CHECKPOINTER_COMP(restartpoints_requested);
124  CHECKPOINTER_COMP(restartpoints_performed);
125  CHECKPOINTER_COMP(write_time);
126  CHECKPOINTER_COMP(sync_time);
127  CHECKPOINTER_COMP(buffers_written);
128 #undef CHECKPOINTER_COMP
129 }
@ LW_SHARED
Definition: lwlock.h:115
#define CHECKPOINTER_COMP(fld)
void reset(void)
Definition: sql-declare.c:600
PgStat_Snapshot snapshot
PgStat_CheckpointerStats checkpointer

References PgStatShared_Checkpointer::changecount, PgStat_ShmemControl::checkpointer, PgStat_Snapshot::checkpointer, CHECKPOINTER_COMP, PgStatShared_Checkpointer::lock, LW_SHARED, LWLockAcquire(), LWLockRelease(), pgstat_copy_changecounted_stats(), pgStatLocal, reset(), PgStatShared_Checkpointer::reset_offset, PgStat_LocalState::shmem, PgStat_LocalState::snapshot, and PgStatShared_Checkpointer::stats.

◆ pgstat_fetch_stat_checkpointer()

◆ pgstat_report_checkpointer()

void pgstat_report_checkpointer ( void  )

Definition at line 30 of file pgstat_checkpointer.c.

31 {
32  /* We assume this initializes to zeroes */
33  static const PgStat_CheckpointerStats all_zeroes;
35 
38 
39  /*
40  * This function can be called even if nothing at all has happened. In
41  * this case, avoid unnecessarily modifying the stats entry.
42  */
43  if (memcmp(&PendingCheckpointerStats, &all_zeroes,
44  sizeof(all_zeroes)) == 0)
45  return;
46 
48 
49 #define CHECKPOINTER_ACC(fld) stats_shmem->stats.fld += PendingCheckpointerStats.fld
50  CHECKPOINTER_ACC(num_timed);
51  CHECKPOINTER_ACC(num_requested);
52  CHECKPOINTER_ACC(restartpoints_timed);
53  CHECKPOINTER_ACC(restartpoints_requested);
54  CHECKPOINTER_ACC(restartpoints_performed);
55  CHECKPOINTER_ACC(write_time);
56  CHECKPOINTER_ACC(sync_time);
57  CHECKPOINTER_ACC(buffers_written);
58 #undef CHECKPOINTER_ACC
59 
61 
62  /*
63  * Clear out the statistics buffer, so it can be re-used.
64  */
66 
67  /*
68  * Report IO statistics
69  */
70  pgstat_flush_io(false);
71 }
#define MemSet(start, val, len)
Definition: c.h:1007
Assert(fmt[strlen(fmt) - 1] !='\n')
PgStat_CheckpointerStats PendingCheckpointerStats
#define CHECKPOINTER_ACC(fld)
static void pgstat_end_changecount_write(uint32 *cc)
#define pgstat_assert_is_up()
static void pgstat_begin_changecount_write(uint32 *cc)
bool pgstat_flush_io(bool nowait)
Definition: pgstat_io.c:173

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

Referenced by CheckpointerMain(), CheckpointWriteDelay(), and HandleCheckpointerInterrupts().

Variable Documentation

◆ PendingCheckpointerStats