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Provide much better wait information in pg_stat_activity.

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When a process is waiting for a heavyweight lock, we will now indicate
the type of heavyweight lock for which it is waiting.  Also, you can
now see when a process is waiting for a lightweight lock - in which
case we will indicate the individual lock name or the tranche, as
appropriate - or for a buffer pin.

Amit Kapila, Ildus Kurbangaliev, reviewed by me.  Lots of helpful
discussion and suggestions by many others, including Alexander
Korotkov, Vladimir Borodin, and many others.
This commit is contained in:
Robert Haas
2016-03-10 12:44:09 -05:00
parent a3a8309d45
commit 53be0b1add
24 changed files with 796 additions and 104 deletions
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2
src/include/storage/lwlock.h
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@@ -187,6 +187,8 @@ extern Size LWLockShmemSize(void);
extern void CreateLWLocks(void);
extern void InitLWLockAccess(void);
extern const char *GetLWLockIdentifier(uint8 classId, uint16 eventId);
/*
* Extensions (or core code) can obtain an LWLocks by calling
* RequestNamedLWLockTranche() during postmaster startup. Subsequently,