linux-kernel - Re: [PATCH 0/6] IO context sharing

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Date:	Tue, 22 Jan 2008 15:49:31 +0100
From:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
To:	Jens Axboe <jens.axboe@...cle.com>
Cc:	linux-kernel@...r.kernel.org, knikanth@...ell.com
Subject: Re: [PATCH 0/6] IO context sharing


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?



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