97 lines
2.4 KiB
C
97 lines
2.4 KiB
C
/*-------------------------------------------------------------------------
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*
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* xlogstats.c
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* Functions for WAL Statitstics
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*
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* Copyright (c) 2022-2023, PostgreSQL Global Development Group
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*
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* IDENTIFICATION
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* src/backend/access/transam/xlogstats.c
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*
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*-------------------------------------------------------------------------
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*/
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#include "postgres.h"
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#include "access/xlogreader.h"
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#include "access/xlogstats.h"
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/*
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* Calculate the size of a record, split into !FPI and FPI parts.
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*/
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void
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XLogRecGetLen(XLogReaderState *record, uint32 *rec_len,
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uint32 *fpi_len)
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{
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int block_id;
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/*
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* Calculate the amount of FPI data in the record.
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*
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* XXX: We peek into xlogreader's private decoded backup blocks for the
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* bimg_len indicating the length of FPI data.
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*/
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*fpi_len = 0;
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for (block_id = 0; block_id <= XLogRecMaxBlockId(record); block_id++)
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{
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if (!XLogRecHasBlockRef(record, block_id))
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continue;
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if (XLogRecHasBlockImage(record, block_id))
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*fpi_len += XLogRecGetBlock(record, block_id)->bimg_len;
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}
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/*
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* Calculate the length of the record as the total length - the length of
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* all the block images.
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*/
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*rec_len = XLogRecGetTotalLen(record) - *fpi_len;
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}
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/*
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* Store per-rmgr and per-record statistics for a given record.
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*/
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void
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XLogRecStoreStats(XLogStats *stats, XLogReaderState *record)
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{
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RmgrId rmid;
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uint8 recid;
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uint32 rec_len;
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uint32 fpi_len;
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Assert(stats != NULL && record != NULL);
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stats->count++;
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rmid = XLogRecGetRmid(record);
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XLogRecGetLen(record, &rec_len, &fpi_len);
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/* Update per-rmgr statistics */
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stats->rmgr_stats[rmid].count++;
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stats->rmgr_stats[rmid].rec_len += rec_len;
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stats->rmgr_stats[rmid].fpi_len += fpi_len;
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/*
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* Update per-record statistics, where the record is identified by a
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* combination of the RmgrId and the four bits of the xl_info field that
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* are the rmgr's domain (resulting in sixteen possible entries per
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* RmgrId).
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*/
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recid = XLogRecGetInfo(record) >> 4;
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/*
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* XACT records need to be handled differently. Those records use the
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* first bit of those four bits for an optional flag variable and the
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* following three bits for the opcode. We filter opcode out of xl_info
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* and use it as the identifier of the record.
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*/
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if (rmid == RM_XACT_ID)
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recid &= 0x07;
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stats->record_stats[rmid][recid].count++;
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stats->record_stats[rmid][recid].rec_len += rec_len;
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stats->record_stats[rmid][recid].fpi_len += fpi_len;
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}
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