linux-kernel - Re: [RFC PATCH] sched: START_NICE feature (temporarily niced forks) (v3)

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Message-ID: <20100915140246.GA25983@elte.hu>
Date:	Wed, 15 Sep 2010 16:02:46 +0200
From:	Ingo Molnar <mingo@...e.hu>
To:	Mike Galbraith <efault@....de>
Cc:	Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Steven Rostedt <rostedt@...dmis.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [RFC PATCH] sched: START_NICE feature (temporarily niced forks)
 (v3)


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

> On Wed, 2010-09-15 at 11:22 +0200, Ingo Molnar wrote:
> > * Mike Galbraith <efault@....de> wrote:
> > 
> > > Tangent: cgroups with classification user/pgid
> > >
> > > taskset -c 3 ./wakeup-latency& sleep 30 && killall wakeup-latency
> > > (taskset -c 3 make -j10 running)
> > > 
> > > maximum latency: 256.5 µs
> > > average latency: 25.7 µs
> > > missed timer events: 0
> > > 
> > > Rather spiffy for this case.
> > 
> > Ouch, nothing beats proper segregation of workloads.
> > 
> > It would be _really_ nice to get that automatically somehow, for make -j 
> > jobs. Perhaps a per tty auto-cgroup-classification kernel feature?
> > 
> > We cannot really rely on distros to pull this off.
> 
> Dunno, wasn't hard.

Renicing a make -j 10 isnt hard either - still people/apps dont do it
:-/

Thanks,

	Ingo
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