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Message-ID: <20090615212651.GA22759@redhat.com>
Date: Mon, 15 Jun 2009 23:26:51 +0200
From: Oleg Nesterov <oleg@...hat.com>
To: Andrew Morton <akpm@...ux-foundation.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>,
Roland McGrath <roland@...hat.com>,
Stanislaw Gruszka <sgruszka@...hat.com>,
Vitaly Mayatskikh <vmayatsk@...hat.com>,
linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] wait_task_zombie: do not use thread_group_cputime()
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.
Signed-off-by: Oleg Nesterov <oleg@...hat.com>
--- PTRACE/kernel/exit.c~2_WAIT_NO_TG 2009-06-15 22:26:02.000000000 +0200
+++ PTRACE/kernel/exit.c 2009-06-15 23:06:45.000000000 +0200
@@ -1192,7 +1192,6 @@ static int wait_task_zombie(struct wait_
if (likely(!traced) && likely(!task_detached(p))) {
struct signal_struct *psig;
struct signal_struct *sig;
- struct task_cputime cputime;
/*
* The resource counters for the group leader are in its
@@ -1208,23 +1207,20 @@ static int wait_task_zombie(struct wait_
* need to protect the access to parent->signal fields,
* as other threads in the parent group can be right
* here reaping other children at the same time.
- *
- * We use thread_group_cputime() to get times for the thread
- * group, which consolidates times for all threads in the
- * group including the group leader.
*/
- thread_group_cputime(p, &cputime);
spin_lock_irq(&p->real_parent->sighand->siglock);
psig = p->real_parent->signal;
sig = p->signal;
psig->cutime =
cputime_add(psig->cutime,
- cputime_add(cputime.utime,
- sig->cutime));
+ cputime_add(p->utime,
+ cputime_add(sig->utime,
+ sig->cutime)));
psig->cstime =
cputime_add(psig->cstime,
- cputime_add(cputime.stime,
- sig->cstime));
+ cputime_add(p->stime,
+ cputime_add(sig->stime,
+ sig->cstime)));
psig->cgtime =
cputime_add(psig->cgtime,
cputime_add(p->gtime,
--
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