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) 2001-2026, 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          373 : pgstat_report_archiver(const char *xlog, bool failed)
      29              : {
      30          373 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      31          373 :     TimestampTz now = GetCurrentTimestamp();
      32              : 
      33          373 :     pgstat_begin_changecount_write(&stats_shmem->changecount);
      34              : 
      35          373 :     if (failed)
      36              :     {
      37            7 :         ++stats_shmem->stats.failed_count;
      38            7 :         memcpy(&stats_shmem->stats.last_failed_wal, xlog,
      39              :                sizeof(stats_shmem->stats.last_failed_wal));
      40            7 :         stats_shmem->stats.last_failed_timestamp = now;
      41              :     }
      42              :     else
      43              :     {
      44          366 :         ++stats_shmem->stats.archived_count;
      45          366 :         memcpy(&stats_shmem->stats.last_archived_wal, xlog,
      46              :                sizeof(stats_shmem->stats.last_archived_wal));
      47          366 :         stats_shmem->stats.last_archived_timestamp = now;
      48              :     }
      49              : 
      50          373 :     pgstat_end_changecount_write(&stats_shmem->changecount);
      51          373 : }
      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           20 : pgstat_fetch_stat_archiver(void)
      59              : {
      60           20 :     pgstat_snapshot_fixed(PGSTAT_KIND_ARCHIVER);
      61              : 
      62           20 :     return &pgStatLocal.snapshot.archiver;
      63              : }
      64              : 
      65              : void
      66         1158 : pgstat_archiver_init_shmem_cb(void *stats)
      67              : {
      68         1158 :     PgStatShared_Archiver *stats_shmem = (PgStatShared_Archiver *) stats;
      69              : 
      70         1158 :     LWLockInitialize(&stats_shmem->lock, LWTRANCHE_PGSTATS_DATA);
      71         1158 : }
      72              : 
      73              : void
      74          242 : pgstat_archiver_reset_all_cb(TimestampTz ts)
      75              : {
      76          242 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      77              : 
      78              :     /* see explanation above PgStatShared_Archiver for the reset protocol */
      79          242 :     LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE);
      80          242 :     pgstat_copy_changecounted_stats(&stats_shmem->reset_offset,
      81          242 :                                     &stats_shmem->stats,
      82              :                                     sizeof(stats_shmem->stats),
      83              :                                     &stats_shmem->changecount);
      84          242 :     stats_shmem->stats.stat_reset_timestamp = ts;
      85          242 :     LWLockRelease(&stats_shmem->lock);
      86          242 : }
      87              : 
      88              : void
      89          744 : pgstat_archiver_snapshot_cb(void)
      90              : {
      91          744 :     PgStatShared_Archiver *stats_shmem = &pgStatLocal.shmem->archiver;
      92          744 :     PgStat_ArchiverStats *stat_snap = &pgStatLocal.snapshot.archiver;
      93          744 :     PgStat_ArchiverStats *reset_offset = &stats_shmem->reset_offset;
      94              :     PgStat_ArchiverStats reset;
      95              : 
      96          744 :     pgstat_copy_changecounted_stats(stat_snap,
      97          744 :                                     &stats_shmem->stats,
      98              :                                     sizeof(stats_shmem->stats),
      99              :                                     &stats_shmem->changecount);
     100              : 
     101          744 :     LWLockAcquire(&stats_shmem->lock, LW_SHARED);
     102          744 :     memcpy(&reset, reset_offset, sizeof(stats_shmem->stats));
     103          744 :     LWLockRelease(&stats_shmem->lock);
     104              : 
     105              :     /* compensate by reset offsets */
     106          744 :     if (stat_snap->archived_count == reset.archived_count)
     107              :     {
     108          716 :         stat_snap->last_archived_wal[0] = 0;
     109          716 :         stat_snap->last_archived_timestamp = 0;
     110              :     }
     111          744 :     stat_snap->archived_count -= reset.archived_count;
     112              : 
     113          744 :     if (stat_snap->failed_count == reset.failed_count)
     114              :     {
     115          734 :         stat_snap->last_failed_wal[0] = 0;
     116          734 :         stat_snap->last_failed_timestamp = 0;
     117              :     }
     118          744 :     stat_snap->failed_count -= reset.failed_count;
     119          744 : }