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/* -------------------------------------------------------------------------
*
* 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"
/*
* Checkpointer global statistics counters. Stored directly in a stats
* message structure so they can be sent without needing to copy things
* around. We assume this init to zeroes.
*/
PgStat_MsgCheckpointer PendingCheckpointerStats;
/*
* Report checkpointer statistics
*/
void
pgstat_report_checkpointer(void)
{
/* We assume this initializes to zeroes */
static const PgStat_MsgCheckpointer all_zeroes;
/*
* This function can be called even if nothing at all has happened. In
* this case, avoid sending a completely empty message to the stats
* collector.
*/
if (memcmp(&PendingCheckpointerStats, &all_zeroes, sizeof(PgStat_MsgCheckpointer)) == 0)
return;
/*
* Prepare and send the message
*/
pgstat_setheader(&PendingCheckpointerStats.m_hdr, PGSTAT_MTYPE_CHECKPOINTER);
pgstat_send(&PendingCheckpointerStats, sizeof(PendingCheckpointerStats));
/*
* Clear out the statistics buffer, so it can be re-used.
*/
MemSet(&PendingCheckpointerStats, 0, sizeof(PendingCheckpointerStats));
}
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