Re: [PATCH v2 1/3] process cputimer is moving faster than its corresponding clock

Olivier Langlois
2013-04-29T17:29:25Z

On Mon, 2013-04-29 at 02:45 +0200, Frederic Weisbecker wrote:
> 2013/4/27 Olivier Langlois <olivier@trillion01.com>:
> >
> >
> > Forbids the cputimer to drift ahead of its process clock by
> > blocking its update when a tick occurs while a autoreaping task
> > is currently in do_exit() between the call to release_task() and
> > its final call to schedule().
> >
> > Any task stats update after having called release_task() will
> > be lost because they are added to the global process stats located
> > in the signal struct from release_task().
> >
> > Ideally, you should postpone the release_task() call after the
> > final context switch to get all the stats added but this is
> > more complex to achieve.
> >
> > In other words, this is slowing down the cputimer so it keep the same
> > pace than the process clock but in fact, what should be done is to
> > speed up the process clock by adding the missing stats to it.
> >
> > Signed-off-by: Olivier Langlois <olivier@trillion01.com>
>
> Thanks.
>
> Could you please resend these three patches in a new mail thread to
> make reviews easier? Also it would be nice to propose a different
> subject for each individual patch. Each of which describing what the
> patch does in a few words.
>
> Thanks.

Frederic, Ok. I will do it and keep the description brief. If someone
inquire more details, I will make them refer back to specific post
inside this thread to avoid unnecessary repetition.

Is this cool?