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Subject: Re: [RFC/RFT PATCH v3] sched: automated per tty task groups
From: Mike Galbraith <efault@gmx.de>
To: Markus Trippelsdorf <markus@trippelsdorf.de>
Cc: Linus Torvalds <torvalds@linux-foundation.org>,
        Oleg Nesterov <oleg@redhat.com>,
        Peter Zijlstra <a.p.zijlstra@chello.nl>,
        Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
        Ingo Molnar <mingo@elte.hu>, LKML <linux-kernel@vger.kernel.org>
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Date: Thu, 11 Nov 2010 12:35:11 -0700
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On Thu, 2010-11-11 at 20:15 +0100, Markus Trippelsdorf wrote:

> Just to add some data; here are the results from my machine (AMD 4
> cores) running a -j4 kernel build, while I browsed the web:
> 
> 1) perf sched record sleep 30
> 
> without:
> total_wakeups: 44306
> avg_wakeup_latency (ns): 36784
> min_wakeup_latency (ns): 0
> max_wakeup_latency (ns): 9378852
> 
> with:
> total_wakeups: 43836
> avg_wakeup_latency (ns): 67607
> min_wakeup_latency (ns): 0
> max_wakeup_latency (ns): 8983036
> 
> 2) perf record -a -e sched:sched_switch -e sched:sched_wakeup sleep 10
> 
> without:
> total_wakeups: 13195
> avg_wakeup_latency (ns): 48484
> min_wakeup_latency (ns): 0
> max_wakeup_latency (ns): 8722497
> 
> with:
> total_wakeups: 14106
> avg_wakeup_latency (ns): 92532
> min_wakeup_latency (ns): 20
> max_wakeup_latency (ns): 5642393
> 
> So the avg_wakeup_latency nearly doubled with your patch, while the
> max_wakeup_latency is lowered by a good amount.

When you say with/without, does that mean enabled/disabled, or
patched/virgin and/or cgroups/nocgroups?

	-Mike