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) 2001-2025, 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          90 : pgstat_report_archiver(const char *xlog, bool failed)
      29             : {
      30          90 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      31          90 :     TimestampTz now = GetCurrentTimestamp();
      32             : 
      33          90 :     pgstat_begin_changecount_write(&stats_shmem->changecount);
      34             : 
      35          90 :     if (failed)
      36             :     {
      37          20 :         ++stats_shmem->stats.failed_count;
      38          20 :         memcpy(&stats_shmem->stats.last_failed_wal, xlog,
      39             :                sizeof(stats_shmem->stats.last_failed_wal));
      40          20 :         stats_shmem->stats.last_failed_timestamp = now;
      41             :     }
      42             :     else
      43             :     {
      44          70 :         ++stats_shmem->stats.archived_count;
      45          70 :         memcpy(&stats_shmem->stats.last_archived_wal, xlog,
      46             :                sizeof(stats_shmem->stats.last_archived_wal));
      47          70 :         stats_shmem->stats.last_archived_timestamp = now;
      48             :     }
      49             : 
      50          90 :     pgstat_end_changecount_write(&stats_shmem->changecount);
      51          90 : }
      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          56 : pgstat_fetch_stat_archiver(void)
      59             : {
      60          56 :     pgstat_snapshot_fixed(PGSTAT_KIND_ARCHIVER);
      61             : 
      62          56 :     return &pgStatLocal.snapshot.archiver;
      63             : }
      64             : 
      65             : void
      66        2084 : pgstat_archiver_init_shmem_cb(void *stats)
      67             : {
      68        2084 :     PgStatShared_Archiver *stats_shmem = (PgStatShared_Archiver *) stats;
      69             : 
      70        2084 :     LWLockInitialize(&stats_shmem->lock, LWTRANCHE_PGSTATS_DATA);
      71        2084 : }
      72             : 
      73             : void
      74         452 : pgstat_archiver_reset_all_cb(TimestampTz ts)
      75             : {
      76         452 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      77             : 
      78             :     /* see explanation above PgStatShared_Archiver for the reset protocol */
      79         452 :     LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE);
      80         452 :     pgstat_copy_changecounted_stats(&stats_shmem->reset_offset,
      81         452 :                                     &stats_shmem->stats,
      82             :                                     sizeof(stats_shmem->stats),
      83             :                                     &stats_shmem->changecount);
      84         452 :     stats_shmem->stats.stat_reset_timestamp = ts;
      85         452 :     LWLockRelease(&stats_shmem->lock);
      86         452 : }
      87             : 
      88             : void
      89        1304 : pgstat_archiver_snapshot_cb(void)
      90             : {
      91        1304 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      92        1304 :     PgStat_ArchiverStats *stat_snap = &pgStatLocal.snapshot.archiver;
      93        1304 :     PgStat_ArchiverStats *reset_offset = &stats_shmem->reset_offset;
      94             :     PgStat_ArchiverStats reset;
      95             : 
      96        1304 :     pgstat_copy_changecounted_stats(stat_snap,
      97        1304 :                                     &stats_shmem->stats,
      98             :                                     sizeof(stats_shmem->stats),
      99             :                                     &stats_shmem->changecount);
     100             : 
     101        1304 :     LWLockAcquire(&stats_shmem->lock, LW_SHARED);
     102        1304 :     memcpy(&reset, reset_offset, sizeof(stats_shmem->stats));
     103        1304 :     LWLockRelease(&stats_shmem->lock);
     104             : 
     105             :     /* compensate by reset offsets */
     106        1304 :     if (stat_snap->archived_count == reset.archived_count)
     107             :     {
     108        1242 :         stat_snap->last_archived_wal[0] = 0;
     109        1242 :         stat_snap->last_archived_timestamp = 0;
     110             :     }
     111        1304 :     stat_snap->archived_count -= reset.archived_count;
     112             : 
     113        1304 :     if (stat_snap->failed_count == reset.failed_count)
     114             :     {
     115        1272 :         stat_snap->last_failed_wal[0] = 0;
     116        1272 :         stat_snap->last_failed_timestamp = 0;
     117             :     }
     118        1304 :     stat_snap->failed_count -= reset.failed_count;
     119        1304 : }