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

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Date:	Wed, 17 Jun 2009 10:13:54 +0200
From:	Stanislaw Gruszka <sgruszka@...hat.com>
To:	Oleg Nesterov <oleg@...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 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);
 }

Regards
Stanislaw
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