linux-kernel - Re: [PATCH 3/5] aio: Rewrite refcounting

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Message-ID: <20121009222153.GG29494@google.com>
Date:	Tue, 9 Oct 2012 15:21:53 -0700
From:	Kent Overstreet <koverstreet@...gle.com>
To:	Zach Brown <zab@...hat.com>
Cc:	linux-bcache@...r.kernel.org, linux-kernel@...r.kernel.org,
	dm-devel@...hat.com, tytso@....edu
Subject: Re: [PATCH 3/5] aio: Rewrite refcounting

On Tue, Oct 09, 2012 at 11:27:55AM -0700, Zach Brown wrote:
> On Mon, Oct 08, 2012 at 11:39:18PM -0700, Kent Overstreet wrote:
> > The refcounting before wasn't very clear; there are two refcounts in
> > struct kioctx, with an unclear relationship between them (or between
> > them and ctx->dead).
> > 
> > Now, reqs_active holds a refcount on users (when reqs_active is
> > nonzero), and the initial refcount is taken on reqs_active - when
> > ctx->dead goes to 1, we drop that initial refcount.
> 
> I agree that it's a mess, but let's rethink this work on top of the
> series I'm sending out that gets rid of the retry and cancel code.  It
> makes the code a lot easier to follow.  (And Jens also has some patches
> to take fewer locks in the submission path, we'll want to take them into
> account too.)

Alright... send it out then. Also, do you know which branch Jens has his
patches in?
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