Adding upstream version 15.4.upstream/15.4upstream

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

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
+}