linux-kernel - Re: [rfc patch] Re: sched: incorrect argument used in task

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Message-Id: <1163799034.23357.2.camel@Homer.simpson.net>
Date:	Fri, 17 Nov 2006 22:30:34 +0100
From:	Mike Galbraith <efault@....de>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	"Chen, Kenneth W" <kenneth.w.chen@...el.com>,
	nickpiggin@...oo.com.au,
	"Siddha, Suresh B" <suresh.b.siddha@...el.com>,
	linux-kernel@...r.kernel.org, Andrew Morton <akpm@...l.org>
Subject: Re: [rfc patch] Re: sched: incorrect argument used in task_hot()

On Fri, 2006-11-17 at 20:20 +0100, Ingo Molnar wrote:
> * Mike Galbraith <efault@....de> wrote:
> 
> > One way to improve granularity, and eliminate the possibility of 
> > p->last_run being > rq->timestamp_tast_tick, and thereby short 
> > circuiting the evaluation of cache_hot_time, is to cache the last 
> > return of sched_clock() at both tick and sched times, and use that 
> > value as our reference instead of the absolute time of the tick.  It 
> > won't totally eliminate skew, but it moves the reference point closer 
> > to the current time on the remote cpu.
> > 
> > Looking for a good place to do this, I chose update_cpu_clock().
> 
> looks good to me - thus we will update the timestamp not only in the 
> timer tick, but also upon every context-switch (when we acquire 
> sched_clock() value anyway). Lets try this in -mm?
> 
> Acked-by: Ingo Molnar <mingo@...e.hu>

Then it needs a blame line.

Signed-off-by: Mike Galbraith <efault@....de>

	-Mike

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