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edadf8098f
There was a wild mishmash of function comment formatting in pgstat, making it hard to know what to use for any new function and hard to extend existing comments (particularly due to randomly different forms of indentation). Author: Andres Freund <andres@anarazel.de> Reviewed-By: Thomas Munro <thomas.munro@gmail.com> Discussion: https://postgr.es/m/20220329191727.mzzwbl7udhpq7pmf@alap3.anarazel.de Discussion: https://postgr.es/m/20220308205351.2xcn6k4x5yivcxyd@alap3.anarazel.de
58 lines
1.7 KiB
C
58 lines
1.7 KiB
C
/* -------------------------------------------------------------------------
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*
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* pgstat_checkpointer.c
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* Implementation of checkpoint statistics.
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*
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* This file contains the implementation of checkpoint statistics. It is kept
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* separate from pgstat.c to enforce the line between the statistics access /
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* storage implementation and the details about individual types of
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* statistics.
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*
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* Copyright (c) 2001-2022, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/backend/utils/activity/pgstat_checkpointer.c
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* -------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "utils/pgstat_internal.h"
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/*
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* Checkpointer global statistics counters. Stored directly in a stats
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* message structure so they can be sent without needing to copy things
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* around. We assume this init to zeroes.
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*/
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PgStat_MsgCheckpointer PendingCheckpointerStats;
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/*
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* Send checkpointer statistics to the collector
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*/
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void
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pgstat_send_checkpointer(void)
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{
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/* We assume this initializes to zeroes */
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static const PgStat_MsgCheckpointer all_zeroes;
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/*
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* This function can be called even if nothing at all has happened. In
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* this case, avoid sending a completely empty message to the stats
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* collector.
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*/
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if (memcmp(&PendingCheckpointerStats, &all_zeroes, sizeof(PgStat_MsgCheckpointer)) == 0)
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return;
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/*
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* Prepare and send the message
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*/
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pgstat_setheader(&PendingCheckpointerStats.m_hdr, PGSTAT_MTYPE_CHECKPOINTER);
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pgstat_send(&PendingCheckpointerStats, sizeof(PendingCheckpointerStats));
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/*
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* Clear out the statistics buffer, so it can be re-used.
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*/
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MemSet(&PendingCheckpointerStats, 0, sizeof(PendingCheckpointerStats));
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}
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