From: Jens Axboe <jens.axboe@oracle.com>
To: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: linux-kernel@vger.kernel.org, knikanth@novell.com
Subject: Re: [PATCH 0/6] IO context sharing
Date: Tue, 22 Jan 2008 19:21:21 +0100 [thread overview]
Message-ID: <20080122182121.GX6258@kernel.dk> (raw)
In-Reply-To: <1201013372.6341.19.camel@lappy>
On Tue, Jan 22 2008, Peter Zijlstra wrote:
>
> On Tue, 2008-01-22 at 10:49 +0100, Jens Axboe wrote:
> > Hi,
> >
> > Today io contexts are per-process and define the (surprise) io context
> > of that process. In some situations it would be handy if several
> > processes share an IO context. With syslets it's especially crucial that
> > the threads working on behalf of the parent process are seen as the same
> > IO context. That goes from both a fairness and performance point of
> > view, since IO schedulers like AS and CFQ base decisions on what the
> > IO context state is. This patchset adds support for processes sharing a
> > single io context and also adds a CLONE_IO flag to denote sharing of
> > IO context.
>
> Are you planning on extending this to a hierarchical CFQ for cgroups, or
> just giving the IO context to a cgroup?
Not sure what extra extensions it would need on the IO side. As long as
the other side makes sure to group its processes by sharing IO context,
then CFQ will treat that as a single entity.
--
Jens Axboe
next prev parent reply other threads:[~2008-01-22 18:21 UTC|newest]
Thread overview: 18+ messages / expand[flat|nested] mbox.gz Atom feed top
2008-01-22 9:49 [PATCH 0/6] IO context sharing Jens Axboe
2008-01-22 9:49 ` [PATCH 1/6] ioprio: move io priority from task_struct to io_context Jens Axboe
2008-01-23 22:07 ` Andrew Morton
2008-01-24 7:30 ` Jens Axboe
2008-01-22 9:49 ` [PATCH 2/6] io context sharing: preliminary support Jens Axboe
2008-01-23 22:08 ` Andrew Morton
2008-01-24 7:36 ` Jens Axboe
2008-01-22 9:49 ` [PATCH 3/6] io_context sharing - cfq changes Jens Axboe
2008-01-22 9:49 ` [PATCH 4/6] block: cfq: make the io contect sharing lockless Jens Axboe
2008-01-23 22:08 ` Andrew Morton
2008-01-24 7:36 ` Jens Axboe
2008-01-24 16:42 ` Paul E. McKenney
2008-01-22 9:49 ` [PATCH 5/6] io_context sharing - anticipatory changes Jens Axboe
2008-01-22 9:49 ` [PATCH 6/6] kernel: add CLONE_IO to specifically request sharing of IO contexts Jens Axboe
2008-01-22 14:49 ` [PATCH 0/6] IO context sharing Peter Zijlstra
2008-01-22 18:21 ` Jens Axboe [this message]
2008-01-23 3:50 ` David Chinner
2008-01-23 8:44 ` Andi Kleen
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