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/* -------------------------------------------------------------------------
*
* pgstat_bgwriter.c
* Implementation of bgwriter statistics.
*
* This file contains the implementation of bgwriter 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_bgwriter.c
* -------------------------------------------------------------------------
*/
#include "postgres.h"
#include "utils/pgstat_internal.h"
/*
* BgWriter 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_MsgBgWriter PendingBgWriterStats;
/*
* Report bgwriter statistics
*/
void
pgstat_send_bgwriter(void)
{
/* We assume this initializes to zeroes */
static const PgStat_MsgBgWriter all_zeroes;
pgstat_assert_is_up();
/*
* 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(&PendingBgWriterStats, &all_zeroes, sizeof(PgStat_MsgBgWriter)) == 0)
return;
/*
* Prepare and send the message
*/
pgstat_setheader(&PendingBgWriterStats.m_hdr, PGSTAT_MTYPE_BGWRITER);
pgstat_send(&PendingBgWriterStats, sizeof(PendingBgWriterStats));
/*
* Clear out the statistics buffer, so it can be re-used.
*/
MemSet(&PendingBgWriterStats, 0, sizeof(PendingBgWriterStats));
}
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