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sched: Change thread_group_cputime() to use for_each_thread() 

Change thread_group_cputime() to use for_each_thread() instead of
buggy while_each_thread(). This also makes the pid_alive() check
unnecessary.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <umgwanakikbuti@gmail.com>
Cc: Hidetoshi Seto <seto.hidetoshi@jp.fujitsu.com>
Cc: Frank Mayhar <fmayhar@google.com>
Cc: Frederic Weisbecker <fweisbec@redhat.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Sanjay Rao <srao@redhat.com>
Cc: Larry Woodman <lwoodman@redhat.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Link: http://lkml.kernel.org/r/20140813192000.GA19327@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Oleg Nesterov 2014-08-13 21:20:00 +02:00 committed by Ingo Molnar
parent d38e83c715
commit 1e4dda08b4
1 changed files with 2 additions and 8 deletions
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10
kernel/sched/cputime.c
View File

@ -294,18 +294,12 @@ void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
times->sum_exec_runtime = sig->sum_sched_runtime; times->sum_exec_runtime = sig->sum_sched_runtime;
rcu_read_lock(); rcu_read_lock();
/* make sure we can trust tsk->thread_group list */ for_each_thread(tsk, t) {
if (!likely(pid_alive(tsk)))
goto out;
t = tsk;
do {
task_cputime(t, &utime, &stime); task_cputime(t, &utime, &stime);
times->utime += utime; times->utime += utime;
times->stime += stime; times->stime += stime;
times->sum_exec_runtime += task_sched_runtime(t); times->sum_exec_runtime += task_sched_runtime(t);
} while_each_thread(tsk, t); }
out:
rcu_read_unlock(); rcu_read_unlock();
} }