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Commit69e8c7c

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Limit memory usage of pg_walinspect functions.
GetWALRecordsInfo() and pg_get_wal_fpi_info() can leak memory acrossWAL record iterations. Fix this by using a temporary memory contextthat's reset for each WAL record iteraion.Also a use temporary context for loops in GetXLogSummaryStats(). Thenumber of iterations is a small constant, so the previous behavior wasnot a leak, but fix for clarity (but no need to backport).Backport GetWALRecordsInfo() change to version15. pg_get_wal_fpi_info() didn't exist in version 15.Reported-by: Peter GeogheganAuthor: Bharath RupireddyDiscussion:https://www.postgresql.org/message-id/CAH2-WznLEJjn7ghmKOABOEZYuJvkTk%3DGKU3m0%2B-XBAH%2BerPiJQ%40mail.gmail.comBackpatch-through: 15
1 parentc6c3b3b commit69e8c7c

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+53
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‎contrib/pg_walinspect/pg_walinspect.c

Lines changed: 53 additions & 5 deletions
Original file line numberDiff line numberDiff line change
@@ -304,6 +304,8 @@ pg_get_wal_fpi_info(PG_FUNCTION_ARGS)
304304
XLogRecPtrstart_lsn;
305305
XLogRecPtrend_lsn;
306306
XLogReaderState*xlogreader;
307+
MemoryContextold_cxt;
308+
MemoryContexttmp_cxt;
307309

308310
start_lsn=PG_GETARG_LSN(0);
309311
end_lsn=PG_GETARG_LSN(1);
@@ -314,14 +316,26 @@ pg_get_wal_fpi_info(PG_FUNCTION_ARGS)
314316

315317
xlogreader=InitXLogReaderState(start_lsn);
316318

319+
tmp_cxt=AllocSetContextCreate(CurrentMemoryContext,
320+
"pg_get_wal_fpi_info temporary cxt",
321+
ALLOCSET_DEFAULT_SIZES);
322+
317323
while (ReadNextXLogRecord(xlogreader)&&
318324
xlogreader->EndRecPtr <=end_lsn)
319325
{
326+
/* Use the tmp context so we can clean up after each tuple is done */
327+
old_cxt=MemoryContextSwitchTo(tmp_cxt);
328+
320329
GetWALFPIInfo(fcinfo,xlogreader);
321330

331+
/* clean up and switch back */
332+
MemoryContextSwitchTo(old_cxt);
333+
MemoryContextReset(tmp_cxt);
334+
322335
CHECK_FOR_INTERRUPTS();
323336
}
324337

338+
MemoryContextDelete(tmp_cxt);
325339
pfree(xlogreader->private_data);
326340
XLogReaderFree(xlogreader);
327341

@@ -440,23 +454,37 @@ GetWALRecordsInfo(FunctionCallInfo fcinfo, XLogRecPtr start_lsn,
440454
ReturnSetInfo*rsinfo= (ReturnSetInfo*)fcinfo->resultinfo;
441455
Datumvalues[PG_GET_WAL_RECORDS_INFO_COLS]= {0};
442456
boolnulls[PG_GET_WAL_RECORDS_INFO_COLS]= {0};
457+
MemoryContextold_cxt;
458+
MemoryContexttmp_cxt;
443459

444460
InitMaterializedSRF(fcinfo,0);
445461

446462
xlogreader=InitXLogReaderState(start_lsn);
447463

464+
tmp_cxt=AllocSetContextCreate(CurrentMemoryContext,
465+
"GetWALRecordsInfo temporary cxt",
466+
ALLOCSET_DEFAULT_SIZES);
467+
448468
while (ReadNextXLogRecord(xlogreader)&&
449469
xlogreader->EndRecPtr <=end_lsn)
450470
{
471+
/* Use the tmp context so we can clean up after each tuple is done */
472+
old_cxt=MemoryContextSwitchTo(tmp_cxt);
473+
451474
GetWALRecordInfo(xlogreader,values,nulls,
452475
PG_GET_WAL_RECORDS_INFO_COLS);
453476

454477
tuplestore_putvalues(rsinfo->setResult,rsinfo->setDesc,
455478
values,nulls);
456479

480+
/* clean up and switch back */
481+
MemoryContextSwitchTo(old_cxt);
482+
MemoryContextReset(tmp_cxt);
483+
457484
CHECK_FOR_INTERRUPTS();
458485
}
459486

487+
MemoryContextDelete(tmp_cxt);
460488
pfree(xlogreader->private_data);
461489
XLogReaderFree(xlogreader);
462490

@@ -560,11 +588,13 @@ GetXLogSummaryStats(XLogStats *stats, ReturnSetInfo *rsinfo,
560588
Datum*values,bool*nulls,uint32ncols,
561589
boolstats_per_record)
562590
{
563-
uint64total_count=0;
564-
uint64total_rec_len=0;
565-
uint64total_fpi_len=0;
566-
uint64total_len=0;
567-
intri;
591+
MemoryContextold_cxt;
592+
MemoryContexttmp_cxt;
593+
uint64total_count=0;
594+
uint64total_rec_len=0;
595+
uint64total_fpi_len=0;
596+
uint64total_len=0;
597+
intri;
568598

569599
/*
570600
* Each row shows its percentages of the total, so make a first pass to
@@ -581,6 +611,10 @@ GetXLogSummaryStats(XLogStats *stats, ReturnSetInfo *rsinfo,
581611
}
582612
total_len=total_rec_len+total_fpi_len;
583613

614+
tmp_cxt=AllocSetContextCreate(CurrentMemoryContext,
615+
"GetXLogSummaryStats temporary cxt",
616+
ALLOCSET_DEFAULT_SIZES);
617+
584618
for (ri=0;ri <=RM_MAX_ID;ri++)
585619
{
586620
uint64count;
@@ -614,6 +648,8 @@ GetXLogSummaryStats(XLogStats *stats, ReturnSetInfo *rsinfo,
614648
if (count==0)
615649
continue;
616650

651+
old_cxt=MemoryContextSwitchTo(tmp_cxt);
652+
617653
/* the upper four bits in xl_info are the rmgr's */
618654
id=desc.rm_identify(rj <<4);
619655
if (id==NULL)
@@ -626,6 +662,10 @@ GetXLogSummaryStats(XLogStats *stats, ReturnSetInfo *rsinfo,
626662

627663
tuplestore_putvalues(rsinfo->setResult,rsinfo->setDesc,
628664
values,nulls);
665+
666+
/* clean up and switch back */
667+
MemoryContextSwitchTo(old_cxt);
668+
MemoryContextReset(tmp_cxt);
629669
}
630670
}
631671
else
@@ -635,14 +675,22 @@ GetXLogSummaryStats(XLogStats *stats, ReturnSetInfo *rsinfo,
635675
fpi_len=stats->rmgr_stats[ri].fpi_len;
636676
tot_len=rec_len+fpi_len;
637677

678+
old_cxt=MemoryContextSwitchTo(tmp_cxt);
679+
638680
FillXLogStatsRow(desc.rm_name,count,total_count,rec_len,
639681
total_rec_len,fpi_len,total_fpi_len,tot_len,
640682
total_len,values,nulls,ncols);
641683

642684
tuplestore_putvalues(rsinfo->setResult,rsinfo->setDesc,
643685
values,nulls);
686+
687+
/* clean up and switch back */
688+
MemoryContextSwitchTo(old_cxt);
689+
MemoryContextReset(tmp_cxt);
644690
}
645691
}
692+
693+
MemoryContextDelete(tmp_cxt);
646694
}
647695

648696
/*

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