linux-kernel - Re: [patch] Re: scheduler oddity [bug?]

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Date:	Mon, 09 Mar 2009 14:37:50 +0100
From:	Mike Galbraith <efault@....de>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
Cc:	Ingo Molnar <mingo@...e.hu>, Balazs Scheidler <bazsi@...abit.hu>,
	linux-kernel@...r.kernel.org, Willy Tarreau <w@....eu>
Subject: Re: [patch] Re: scheduler oddity [bug?]

On Mon, 2009-03-09 at 14:16 +0100, Mike Galbraith wrote:
> On Mon, 2009-03-09 at 12:04 +0100, Peter Zijlstra wrote:
> 
> > OK, talked a bit with Ingo, the reason you're doing is that avg_overlap
> > can easily grow stale.. I can see that happen indeed.
> > 
> > So the 'perfect' thing would be a task-runtime decay, barring that the
> > preemption thing seems a sane enough hart-beat of a task.
> > 
> > How does the below look to you?
> 
> Other than the fact that the test for sync reject is currently
> avg_overlap > sysctl_sched_migration_cost, looks fine to me.  Having it
> capped at the boundary is probably the better way to go.

Heh, doesn't _quite_ work though.  The little bugger now hovers just
under :-/

pipetest (5976, #threads: 1)
---------------------------------------------------------
se.exec_start                      :        150672.502691
se.vruntime                        :         94882.186606
se.sum_exec_runtime                :         34875.797932
se.avg_overlap                     :             0.499993
nr_switches                        :                 3680
nr_voluntary_switches              :                    0
nr_involuntary_switches            :                 3680
se.load.weight                     :                 1024
policy                             :                    0
prio                               :                  120
clock-delta                        :                  112

pipetest (5977, #threads: 1)
---------------------------------------------------------
se.exec_start                      :        150665.016951
se.vruntime                        :         94817.157909
se.sum_exec_runtime                :          7069.323019
se.avg_overlap                     :             0.012718
nr_switches                        :                 2931
nr_voluntary_switches              :                 2930
nr_involuntary_switches            :                    1
se.load.weight                     :                 1024
policy                             :                    0
prio                               :                  120
clock-delta                        :                  117


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