Re: [PATCH] Refactoring of LWLock tranches

Robert Haas wrote:
> On Tue, Sep 22, 2015 at 5:16 AM, Ildus Kurbangaliev
> <i.kurbangaliev@postgrespro.ru> wrote:
> > Yes, probably.
> > I'm going to change API calls as you suggested earlier.
> > How you do think the tranches registration after initialization should
> > look like?
> 
> I don't see any need to change anything there.  The idea there is that
> an extension allocates a tranche ID and are responsible for making
> sure that every backend that uses that tranche finds out about the ID
> that was chosen and registers a matching tranche definition.  How to
> do that is the extension's problem.  Maybe eventually we'll provide
> some tools to make that easier, but that's separate from the work
> we're trying to do here.

FWIW I had assumed, when you created the tranche stuff, that SLRU users
would all allocate their lwlocks from a tranche provided by slru.c
itself, and the locks would be stored in the slru Ctl struct.  Does that
not work for some reason?

-- 
Álvaro Herrera                http://www.2ndQuadrant.com/
PostgreSQL Development, 24x7 Support, Remote DBA, Training & Services