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Truncate predicate lock manager's SLRU lazily at checkpoint. That's safer

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than doing it aggressively whenever the tail-XID pointer is advanced, because
this way we don't need to do it while holding SerializableXactHashLock.

This also fixes bug #5915 spotted by YAMAMOTO Takashi, and removes an
obsolete comment spotted by Kevin Grittner.
This commit is contained in:
Heikki Linnakangas
2011-03-08 12:07:29 +02:00
parent 804d13adfd
commit 4cd3fb6e12
3 changed files with 69 additions and 52 deletions
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2
src/backend/access/transam/xlog.c
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@ -48,6 +48,7 @@
#include "storage/ipc.h"
#include "storage/latch.h"
#include "storage/pmsignal.h"
#include "storage/predicate.h"
#include "storage/procarray.h"
#include "storage/reinit.h"
#include "storage/smgr.h"
@ -7875,6 +7876,7 @@ CheckPointGuts(XLogRecPtr checkPointRedo, int flags)
CheckPointCLOG();
CheckPointSUBTRANS();
CheckPointMultiXact();
CheckPointPredicate();
CheckPointRelationMap();
CheckPointBuffers(flags); /* performs all required fsyncs */
/* We deliberately delay 2PC checkpointing as long as possible */