linux-kernel - Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

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Message-ID: <1289829658.16406.78.camel@maggy.simson.net>
Date:	Mon, 15 Nov 2010 07:00:58 -0700
From:	Mike Galbraith <efault@....de>
To:	Linus Torvalds <torvalds@...ux-foundation.org>
Cc:	Markus Trippelsdorf <markus@...ppelsdorf.de>,
	Oleg Nesterov <oleg@...hat.com>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	Ingo Molnar <mingo@...e.hu>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups

On Sun, 2010-11-14 at 19:12 -0800, Linus Torvalds wrote:

> I'm also very happy with just what it does to interactive performance.
> Admittedly, my "testcase" is really trivial (reading email in a
> web-browser, scrolling around a bit, while doing a "make -j64" on the
> kernel at the same time), but it's a test-case that is very relevant
> for me. And it is a _huge_ improvement.

Next logical auto-step would be to try to subvert cfq.  At a glance,
io_context looks highly hackable for !CONFIG_CFQ_GROUP_IOSCHED case.
The other case may get interesting for someone not very familiar with
cfq innards, but I see a tempting looking subversion point.

	-Mike

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