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

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Date:	Tue, 19 Oct 2010 13:56:48 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>
Subject: Re: [RFC/RFT PATCH] sched: automated per tty task groups


* Mike Galbraith <efault@....de> wrote:

> Using Mathieu Desnoyers' wakeup-latency testcase (attached):
> 
> With taskset -c 3 make -j 10 running..
> 
> taskset -c 3 ./wakeup-latency& sleep 30;killall wakeup-latency
> 
> without:
>  maximum latency: 42963.2 µs
>  average latency: 9077.0 µs
>  missed timer events: 0
> 
> with:
>  maximum latency: 4160.7 µs
>  average latency: 149.4 µs
>  missed timer events: 0
> 
> Patch makes a big difference in desktop feel under hefty load here.

That's really nice!

Could this feature realistically do block IO isolation as well? It's always annoying 
when some big IO job is making the desktop jerky. Especially as your patch is 
selecting the block cgroup feature already:

+       select BLK_CGROUP

Thanks,

	Ingo
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