lkml.org 
[lkml]   [2006]   [Nov]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
SubjectRe: [rfc patch] Re: sched: incorrect argument used in task_hot()
From
Date
On Fri, 2006-11-17 at 20:20 +0100, Ingo Molnar wrote:
> * Mike Galbraith <efault@gmx.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@elte.hu>

Then it needs a blame line.

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

-Mike

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2006-11-17 22:31    [W:0.096 / U:0.584 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site