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Subject: Re: [RFC PATCH] sched: START_NICE feature (temporarily niced
 forks) (v3)
From: Mike Galbraith <efault@gmx.de>
To: Ingo Molnar <mingo@elte.hu>
Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        LKML <linux-kernel@vger.kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Andrew Morton <akpm@linux-foundation.org>,
        Steven Rostedt <rostedt@goodmis.org>,
        Thomas Gleixner <tglx@linutronix.de>, Tony Lindgren <tony@atomide.com>
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Date: Thu, 16 Sep 2010 12:30:47 +0200
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On Wed, 2010-09-15 at 16:02 +0200, Ingo Molnar wrote:
> * Mike Galbraith <efault@gmx.de> wrote:
> 
> > On Wed, 2010-09-15 at 11:22 +0200, Ingo Molnar wrote:
> > > * Mike Galbraith <efault@gmx.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
> :-/

True.  I'll put resurrect/tinker usersched back on good intentions list.

	-Mike