linux-kernel - Re: [PATCH 2/2] wait_task_zombie: do not use thread_group

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Date:	Wed, 17 Jun 2009 14:23:52 +0200
From:	Oleg Nesterov <oleg@...hat.com>
To:	Stanislaw Gruszka <sgruszka@...hat.com>
Cc:	Andrew Morton <akpm@...ux-foundation.org>,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Roland McGrath <roland@...hat.com>,
	Vitaly Mayatskikh <vmayatsk@...hat.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH 2/2] wait_task_zombie: do not use thread_group_cputime()

On 06/17, Stanislaw Gruszka wrote:
>
> On Mon, 15 Jun 2009 23:26:51 +0200
> Oleg Nesterov <oleg@...hat.com> wrote:
>
> > There is no reason for thread_group_cputime() in wait_task_zombie(),
> > there must be no other threads.
> >
> > This call was previously needed to collect the per-cpu data which
> > we do not have any longer.
>
> Is similar change for posix_cpu_timers_exit_group() correct and worthwhile ?
>
>  void posix_cpu_timers_exit_group(struct task_struct *tsk)
>  {
> -       struct task_cputime cputime;
> +       struct signal_struct *const sig = tsk->signal;
>
> -       thread_group_cputimer(tsk, &cputime);
>         cleanup_timers(tsk->signal->cpu_timers,
> -                      cputime.utime, cputime.stime, cputime.sum_exec_runtime);
> +                      cputime_add(tsk->utime, sig->utime),
> +                      cputime_add(tsk->stime, sig->stime),
> +                      tsk->se.sum_exec_runtime + sig->sum_sched_runtime);
>  }

Yes, I think you are right.

And I think thread_group_cputimer() was never needed, it should be
thread_group_cputime(). Which in turn is not needed any longer too.

Please re-send with changelog/subject ?

Oleg.

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