linux-kernel - Re: [GIT PULL] core block IO bits for 3.8

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Message-ID: <50CF6D7C.2000300@kernel.dk>
Date:	Mon, 17 Dec 2012 20:07:40 +0100
From:	Jens Axboe <axboe@...nel.dk>
To:	Tejun Heo <tj@...nel.org>
CC:	Jeff Moyer <jmoyer@...hat.com>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] core block IO bits for 3.8

On 2012-12-17 18:47, Tejun Heo wrote:
> Hello, Jens.
> 
> On Mon, Dec 17, 2012 at 06:04:42PM +0100, Jens Axboe wrote:
>> OK, if you have something generic for threadpools in mind, we can wait
>> with this one. I just thought that a "real" interface was nicer than
>> manual setting, especially since the flusher threads come and go. Then
>> you'd need some udev hook to get it set, not even sure how easy that
>> would be with the weird linkage.
> 
> I've been thinking about this and I think what we really need is a
> generic interface for thread pools where the user can specify various
> attributes - priority, affinity and probably cgroup association, so
> that those attributes are exposed in generic manner while backend
> creates and manages worker pools identified by actual attriutes so
> that we don't end up with gazillion pools.  crypto and writeback would
> be the obvious users and probably the virtio too.  I'll write more
> when things get more concrete.

I agree. That part of the writeback code is pretty generic
functionality.

So new course of action is to revert the commit, and then I'm sure Jeff
will re-send the code to just set the affinity to something sane by
default when that is easily doable.

-- 
Jens Axboe

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