From: | Andres Freund <andres(at)anarazel(dot)de> |
---|---|
To: | Robert Haas <rhaas(at)postgresql(dot)org> |
Cc: | pgsql-committers(at)postgresql(dot)org |
Subject: | Re: pgsql: Change the way that LWLocks for extensions are allocated. |
Date: | 2016-08-26 22:00:26 |
Message-ID: | 20160826220026.2fw6xj56qgd22wqi@alap3.anarazel.de |
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Lists: | pgsql-committers pgsql-hackers |
Hi,
On 2016-02-04 21:43:14 +0000, Robert Haas wrote:
> Change the way that LWLocks for extensions are allocated.
>
> The previous RequestAddinLWLocks() method had several disadvantages.
> First, the locks would be in the main tranche; we've recently decided
> that it's useful for LWLocks used for separate purposes to have
> separate tranche IDs. Second, there wasn't any correlation between
> what code called RequestAddinLWLocks() and what code called
> LWLockAssign(); when multiple modules are in use, it could become
> quite difficult to troubleshoot problems where LWLockAssign() ran out
> of locks. To fix, create a concept of named LWLock tranches which
> can be used either by extension or by core code.
>
> Amit Kapila and Robert Haas
I noticed that this code has no test coverage:
http://coverage.postgresql.org/src/backend/storage/lmgr/lwlock.c.gcov.html
It'd be good to add some, although I'm not entirely sure what the best
way is. Maybe add a simple pg_stat_statements test?
Andres
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