Line data    Source code

       1             : /* -------------------------------------------------------------------------
       2             :  *
       3             :  * pgstat_archiver.c
       4             :  *    Implementation of archiver statistics.
       5             :  *
       6             :  * This file contains the implementation of archiver statistics. It is kept
       7             :  * separate from pgstat.c to enforce the line between the statistics access /
       8             :  * storage implementation and the details about individual types of
       9             :  * statistics.
      10             :  *
      11             :  * Copyright (c) 2001-2023, PostgreSQL Global Development Group
      12             :  *
      13             :  * IDENTIFICATION
      14             :  *    src/backend/utils/activity/pgstat_archiver.c
      15             :  * -------------------------------------------------------------------------
      16             :  */
      17             : 
      18             : #include "postgres.h"
      19             : 
      20             : #include "utils/pgstat_internal.h"
      21             : #include "utils/timestamp.h"
      22             : 
      23             : 
      24             : /*
      25             :  * Report archiver statistics
      26             :  */
      27             : void
      28          60 : pgstat_report_archiver(const char *xlog, bool failed)
      29             : {
      30          60 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      31          60 :     TimestampTz now = GetCurrentTimestamp();
      32             : 
      33          60 :     pgstat_begin_changecount_write(&stats_shmem->changecount);
      34             : 
      35          60 :     if (failed)
      36             :     {
      37           2 :         ++stats_shmem->stats.failed_count;
      38           2 :         memcpy(&stats_shmem->stats.last_failed_wal, xlog,
      39             :                sizeof(stats_shmem->stats.last_failed_wal));
      40           2 :         stats_shmem->stats.last_failed_timestamp = now;
      41             :     }
      42             :     else
      43             :     {
      44          58 :         ++stats_shmem->stats.archived_count;
      45          58 :         memcpy(&stats_shmem->stats.last_archived_wal, xlog,
      46             :                sizeof(stats_shmem->stats.last_archived_wal));
      47          58 :         stats_shmem->stats.last_archived_timestamp = now;
      48             :     }
      49             : 
      50          60 :     pgstat_end_changecount_write(&stats_shmem->changecount);
      51          60 : }
      52             : 
      53             : /*
      54             :  * Support function for the SQL-callable pgstat* functions. Returns
      55             :  * a pointer to the archiver statistics struct.
      56             :  */
      57             : PgStat_ArchiverStats *
      58          32 : pgstat_fetch_stat_archiver(void)
      59             : {
      60          32 :     pgstat_snapshot_fixed(PGSTAT_KIND_ARCHIVER);
      61             : 
      62          32 :     return &pgStatLocal.snapshot.archiver;
      63             : }
      64             : 
      65             : void
      66         378 : pgstat_archiver_reset_all_cb(TimestampTz ts)
      67             : {
      68         378 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      69             : 
      70             :     /* see explanation above PgStatShared_Archiver for the reset protocol */
      71         378 :     LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE);
      72         378 :     pgstat_copy_changecounted_stats(&stats_shmem->reset_offset,
      73         378 :                                     &stats_shmem->stats,
      74             :                                     sizeof(stats_shmem->stats),
      75             :                                     &stats_shmem->changecount);
      76         378 :     stats_shmem->stats.stat_reset_timestamp = ts;
      77         378 :     LWLockRelease(&stats_shmem->lock);
      78         378 : }
      79             : 
      80             : void
      81         960 : pgstat_archiver_snapshot_cb(void)
      82             : {
      83         960 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      84         960 :     PgStat_ArchiverStats *stat_snap = &pgStatLocal.snapshot.archiver;
      85         960 :     PgStat_ArchiverStats *reset_offset = &stats_shmem->reset_offset;
      86             :     PgStat_ArchiverStats reset;
      87             : 
      88         960 :     pgstat_copy_changecounted_stats(stat_snap,
      89         960 :                                     &stats_shmem->stats,
      90             :                                     sizeof(stats_shmem->stats),
      91             :                                     &stats_shmem->changecount);
      92             : 
      93         960 :     LWLockAcquire(&stats_shmem->lock, LW_SHARED);
      94         960 :     memcpy(&reset, reset_offset, sizeof(stats_shmem->stats));
      95         960 :     LWLockRelease(&stats_shmem->lock);
      96             : 
      97             :     /* compensate by reset offsets */
      98         960 :     if (stat_snap->archived_count == reset.archived_count)
      99             :     {
     100         922 :         stat_snap->last_archived_wal[0] = 0;
     101         922 :         stat_snap->last_archived_timestamp = 0;
     102             :     }
     103         960 :     stat_snap->archived_count -= reset.archived_count;
     104             : 
     105         960 :     if (stat_snap->failed_count == reset.failed_count)
     106             :     {
     107         944 :         stat_snap->last_failed_wal[0] = 0;
     108         944 :         stat_snap->last_failed_timestamp = 0;
     109             :     }
     110         960 :     stat_snap->failed_count -= reset.failed_count;
     111         960 : }