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/*-------------------------------------------------------------------------
*
* xlogstats.c
* Functions for WAL Statitstics
*
* Copyright (c) 2022, PostgreSQL Global Development Group
*
* IDENTIFICATION
* src/backend/access/transam/xlogstats.c
*
*-------------------------------------------------------------------------
*/
#include "postgres.h"
#include "access/xlogreader.h"
#include "access/xlogstats.h"
/*
* Calculate the size of a record, split into !FPI and FPI parts.
*/
void
XLogRecGetLen(XLogReaderState *record, uint32 *rec_len,
uint32 *fpi_len)
{
int block_id;
/*
* Calculate the amount of FPI data in the record.
*
* XXX: We peek into xlogreader's private decoded backup blocks for the
* bimg_len indicating the length of FPI data.
*/
*fpi_len = 0;
for (block_id = 0; block_id <= XLogRecMaxBlockId(record); block_id++)
{
if (!XLogRecHasBlockRef(record, block_id))
continue;
if (XLogRecHasBlockImage(record, block_id))
*fpi_len += XLogRecGetBlock(record, block_id)->bimg_len;
}
/*
* Calculate the length of the record as the total length - the length of
* all the block images.
*/
*rec_len = XLogRecGetTotalLen(record) - *fpi_len;
}
/*
* Store per-rmgr and per-record statistics for a given record.
*/
void
XLogRecStoreStats(XLogStats *stats, XLogReaderState *record)
{
RmgrId rmid;
uint8 recid;
uint32 rec_len;
uint32 fpi_len;
Assert(stats != NULL && record != NULL);
stats->count++;
rmid = XLogRecGetRmid(record);
XLogRecGetLen(record, &rec_len, &fpi_len);
/* Update per-rmgr statistics */
stats->rmgr_stats[rmid].count++;
stats->rmgr_stats[rmid].rec_len += rec_len;
stats->rmgr_stats[rmid].fpi_len += fpi_len;
/*
* Update per-record statistics, where the record is identified by a
* combination of the RmgrId and the four bits of the xl_info field that
* are the rmgr's domain (resulting in sixteen possible entries per
* RmgrId).
*/
recid = XLogRecGetInfo(record) >> 4;
/*
* XACT records need to be handled differently. Those records use the
* first bit of those four bits for an optional flag variable and the
* following three bits for the opcode. We filter opcode out of xl_info
* and use it as the identifier of the record.
*/
if (rmid == RM_XACT_ID)
recid &= 0x07;
stats->record_stats[rmid][recid].count++;
stats->record_stats[rmid][recid].rec_len += rec_len;
stats->record_stats[rmid][recid].fpi_len += fpi_len;
}
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