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1 : /* ------------------------------------------------------------------------- 2 : * 3 : * pgstat_checkpointer.c 4 : * Implementation of checkpoint statistics. 5 : * 6 : * This file contains the implementation of checkpoint 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_checkpointer.c 15 : * ------------------------------------------------------------------------- 16 : */ 17 : 18 : #include "postgres.h" 19 : 20 : #include "utils/pgstat_internal.h" 21 : 22 : 23 : PgStat_CheckpointerStats PendingCheckpointerStats = {0}; 24 : 25 : 26 : /* 27 : * Report checkpointer and IO statistics 28 : */ 29 : void 30 13426 : pgstat_report_checkpointer(void) 31 : { 32 : /* We assume this initializes to zeroes */ 33 : static const PgStat_CheckpointerStats all_zeroes; 34 13426 : PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer; 35 : 36 : Assert(!pgStatLocal.shmem->is_shutdown); 37 : pgstat_assert_is_up(); 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 13426 : if (memcmp(&PendingCheckpointerStats, &all_zeroes, 44 : sizeof(all_zeroes)) == 0) 45 1048 : return; 46 : 47 12378 : pgstat_begin_changecount_write(&stats_shmem->changecount); 48 : 49 : #define CHECKPOINTER_ACC(fld) stats_shmem->stats.fld += PendingCheckpointerStats.fld 50 12378 : CHECKPOINTER_ACC(timed_checkpoints); 51 12378 : CHECKPOINTER_ACC(requested_checkpoints); 52 12378 : CHECKPOINTER_ACC(checkpoint_write_time); 53 12378 : CHECKPOINTER_ACC(checkpoint_sync_time); 54 12378 : CHECKPOINTER_ACC(buf_written_checkpoints); 55 12378 : CHECKPOINTER_ACC(buf_written_backend); 56 12378 : CHECKPOINTER_ACC(buf_fsync_backend); 57 : #undef CHECKPOINTER_ACC 58 : 59 12378 : pgstat_end_changecount_write(&stats_shmem->changecount); 60 : 61 : /* 62 : * Clear out the statistics buffer, so it can be re-used. 63 : */ 64 99024 : MemSet(&PendingCheckpointerStats, 0, sizeof(PendingCheckpointerStats)); 65 : 66 : /* 67 : * Report IO statistics 68 : */ 69 12378 : pgstat_flush_io(false); 70 : } 71 : 72 : /* 73 : * pgstat_fetch_stat_checkpointer() - 74 : * 75 : * Support function for the SQL-callable pgstat* functions. Returns 76 : * a pointer to the checkpointer statistics struct. 77 : */ 78 : PgStat_CheckpointerStats * 79 28 : pgstat_fetch_stat_checkpointer(void) 80 : { 81 28 : pgstat_snapshot_fixed(PGSTAT_KIND_CHECKPOINTER); 82 : 83 28 : return &pgStatLocal.snapshot.checkpointer; 84 : } 85 : 86 : void 87 890 : pgstat_checkpointer_reset_all_cb(TimestampTz ts) 88 : { 89 890 : PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer; 90 : 91 : /* see explanation above PgStatShared_Checkpointer for the reset protocol */ 92 890 : LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE); 93 890 : pgstat_copy_changecounted_stats(&stats_shmem->reset_offset, 94 890 : &stats_shmem->stats, 95 : sizeof(stats_shmem->stats), 96 : &stats_shmem->changecount); 97 890 : LWLockRelease(&stats_shmem->lock); 98 890 : } 99 : 100 : void 101 1986 : pgstat_checkpointer_snapshot_cb(void) 102 : { 103 1986 : PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer; 104 1986 : PgStat_CheckpointerStats *reset_offset = &stats_shmem->reset_offset; 105 : PgStat_CheckpointerStats reset; 106 : 107 1986 : pgstat_copy_changecounted_stats(&pgStatLocal.snapshot.checkpointer, 108 1986 : &stats_shmem->stats, 109 : sizeof(stats_shmem->stats), 110 : &stats_shmem->changecount); 111 : 112 1986 : LWLockAcquire(&stats_shmem->lock, LW_SHARED); 113 1986 : memcpy(&reset, reset_offset, sizeof(stats_shmem->stats)); 114 1986 : LWLockRelease(&stats_shmem->lock); 115 : 116 : /* compensate by reset offsets */ 117 : #define CHECKPOINTER_COMP(fld) pgStatLocal.snapshot.checkpointer.fld -= reset.fld; 118 1986 : CHECKPOINTER_COMP(timed_checkpoints); 119 1986 : CHECKPOINTER_COMP(requested_checkpoints); 120 1986 : CHECKPOINTER_COMP(checkpoint_write_time); 121 1986 : CHECKPOINTER_COMP(checkpoint_sync_time); 122 1986 : CHECKPOINTER_COMP(buf_written_checkpoints); 123 1986 : CHECKPOINTER_COMP(buf_written_backend); 124 1986 : CHECKPOINTER_COMP(buf_fsync_backend); 125 : #undef CHECKPOINTER_COMP 126 1986 : }