Re: [RFC] [PATCH] A clean aEvgeniy pproach to writeout throttling

From: Daniel Phillips <phillips@phunq.net>
To: Jens Axboe <jens.axboe@oracle.com>
Cc: linux-kernel@vger.kernel.org,
	Andrew Morton <akpm@linux-foundation.org>,
	Peter Zijlstra <peterz@infradead.org>
Subject: Re: [RFC] [PATCH] A clean aEvgeniy pproach to writeout throttling
Date: Tue, 11 Dec 2007 11:38:57 -0800	[thread overview]
Message-ID: <200712111138.58197.phillips@phunq.net> (raw)
In-Reply-To: <20071211131514.GB25437@kernel.dk>

On Tuesday 11 December 2007 05:15, Jens Axboe wrote:
> On Mon, Dec 10 2007, Daniel Phillips wrote:
> > Now about that block writeout deadlock... it doesn't just affect my
> > code, it basically breaks Linux as a storage platform, among other
> > things.
>
> As written in other similar threads in the past in which you also
> participated, I still of the opinion that this is a vm issue and
> should be solved as such.

The problem is solved.  The main cornerstone of the solution is
bio throttling, simply because the resources in question are consumed by 
bio transactions.

> As to the patch in question "fixing" it in the block layer, it's a
> fairly simple work around and I'm not totally against it. If you get
> rid of the ->bi_throttle stuff and just do sanity checks on the
> count, then we could look at getting some testing done.

Testing is already progressing fine without you, thankyou.  If you do 
want to participate, welcome, otherwise it is not a problem.  Thanks 
for picking up that bug yesterday.

Daniel