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author | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:46:48 +0000 |
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committer | Daniel Baumann <daniel.baumann@progress-linux.org> | 2024-04-16 19:46:48 +0000 |
commit | 311bcfc6b3acdd6fd152798c7f287ddf74fa2a98 (patch) | |
tree | 0ec307299b1dada3701e42f4ca6eda57d708261e /src/backend/utils/activity/pgstat_checkpointer.c | |
parent | Initial commit. (diff) | |
download | postgresql-15-upstream.tar.xz postgresql-15-upstream.zip |
Adding upstream version 15.4.upstream/15.4upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/backend/utils/activity/pgstat_checkpointer.c')
-rw-r--r-- | src/backend/utils/activity/pgstat_checkpointer.c | 121 |
1 files changed, 121 insertions, 0 deletions
diff --git a/src/backend/utils/activity/pgstat_checkpointer.c b/src/backend/utils/activity/pgstat_checkpointer.c new file mode 100644 index 0000000..af8d513 --- /dev/null +++ b/src/backend/utils/activity/pgstat_checkpointer.c @@ -0,0 +1,121 @@ +/* ------------------------------------------------------------------------- + * + * pgstat_checkpointer.c + * Implementation of checkpoint statistics. + * + * This file contains the implementation of checkpoint statistics. It is kept + * separate from pgstat.c to enforce the line between the statistics access / + * storage implementation and the details about individual types of + * statistics. + * + * Copyright (c) 2001-2022, PostgreSQL Global Development Group + * + * IDENTIFICATION + * src/backend/utils/activity/pgstat_checkpointer.c + * ------------------------------------------------------------------------- + */ + +#include "postgres.h" + +#include "utils/pgstat_internal.h" + + +PgStat_CheckpointerStats PendingCheckpointerStats = {0}; + + +/* + * Report checkpointer statistics + */ +void +pgstat_report_checkpointer(void) +{ + /* We assume this initializes to zeroes */ + static const PgStat_CheckpointerStats all_zeroes; + PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer; + + Assert(!pgStatLocal.shmem->is_shutdown); + pgstat_assert_is_up(); + + /* + * This function can be called even if nothing at all has happened. In + * this case, avoid unnecessarily modifying the stats entry. + */ + if (memcmp(&PendingCheckpointerStats, &all_zeroes, + sizeof(all_zeroes)) == 0) + return; + + pgstat_begin_changecount_write(&stats_shmem->changecount); + +#define CHECKPOINTER_ACC(fld) stats_shmem->stats.fld += PendingCheckpointerStats.fld + CHECKPOINTER_ACC(timed_checkpoints); + CHECKPOINTER_ACC(requested_checkpoints); + CHECKPOINTER_ACC(checkpoint_write_time); + CHECKPOINTER_ACC(checkpoint_sync_time); + CHECKPOINTER_ACC(buf_written_checkpoints); + CHECKPOINTER_ACC(buf_written_backend); + CHECKPOINTER_ACC(buf_fsync_backend); +#undef CHECKPOINTER_ACC + + pgstat_end_changecount_write(&stats_shmem->changecount); + + /* + * Clear out the statistics buffer, so it can be re-used. + */ + MemSet(&PendingCheckpointerStats, 0, sizeof(PendingCheckpointerStats)); +} + +/* + * pgstat_fetch_stat_checkpointer() - + * + * Support function for the SQL-callable pgstat* functions. Returns + * a pointer to the checkpointer statistics struct. + */ +PgStat_CheckpointerStats * +pgstat_fetch_stat_checkpointer(void) +{ + pgstat_snapshot_fixed(PGSTAT_KIND_CHECKPOINTER); + + return &pgStatLocal.snapshot.checkpointer; +} + +void +pgstat_checkpointer_reset_all_cb(TimestampTz ts) +{ + PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer; + + /* see explanation above PgStatShared_Checkpointer for the reset protocol */ + LWLockAcquire(&stats_shmem->lock, LW_EXCLUSIVE); + pgstat_copy_changecounted_stats(&stats_shmem->reset_offset, + &stats_shmem->stats, + sizeof(stats_shmem->stats), + &stats_shmem->changecount); + LWLockRelease(&stats_shmem->lock); +} + +void +pgstat_checkpointer_snapshot_cb(void) +{ + PgStatShared_Checkpointer *stats_shmem = &pgStatLocal.shmem->checkpointer; + PgStat_CheckpointerStats *reset_offset = &stats_shmem->reset_offset; + PgStat_CheckpointerStats reset; + + pgstat_copy_changecounted_stats(&pgStatLocal.snapshot.checkpointer, + &stats_shmem->stats, + sizeof(stats_shmem->stats), + &stats_shmem->changecount); + + LWLockAcquire(&stats_shmem->lock, LW_SHARED); + memcpy(&reset, reset_offset, sizeof(stats_shmem->stats)); + LWLockRelease(&stats_shmem->lock); + + /* compensate by reset offsets */ +#define CHECKPOINTER_COMP(fld) pgStatLocal.snapshot.checkpointer.fld -= reset.fld; + CHECKPOINTER_COMP(timed_checkpoints); + CHECKPOINTER_COMP(requested_checkpoints); + CHECKPOINTER_COMP(checkpoint_write_time); + CHECKPOINTER_COMP(checkpoint_sync_time); + CHECKPOINTER_COMP(buf_written_checkpoints); + CHECKPOINTER_COMP(buf_written_backend); + CHECKPOINTER_COMP(buf_fsync_backend); +#undef CHECKPOINTER_COMP +} |