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authorFrederic Weisbecker <fweisbec@gmail.com>2012-11-21 15:55:59 +0100
committerFrederic Weisbecker <fweisbec@gmail.com>2012-11-28 17:07:38 +0100
commita634f93335daa8f38180a0e576ccd68a73c36eaf (patch)
tree19cb10ec27da81bd07a3eec1b4d4e9f814402c3a /kernel/sched
parentec05a2311c35243cea08bca00bcf53a576ee41a2 (diff)
downloadlinaro-lsk-a634f93335daa8f38180a0e576ccd68a73c36eaf.tar.gz
cputime: Move thread_group_cputime() to sched code
thread_group_cputime() is a general cputime API that is not only used by posix cpu timer. Let's move this helper to sched code. Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Diffstat (limited to 'kernel/sched')
-rw-r--r--kernel/sched/cputime.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c
index 8d859dae5be..e56f138a23c 100644
--- a/kernel/sched/cputime.c
+++ b/kernel/sched/cputime.c
@@ -288,6 +288,34 @@ static __always_inline bool steal_account_process_tick(void)
return false;
}
+/*
+ * Accumulate raw cputime values of dead tasks (sig->[us]time) and live
+ * tasks (sum on group iteration) belonging to @tsk's group.
+ */
+void thread_group_cputime(struct task_struct *tsk, struct task_cputime *times)
+{
+ struct signal_struct *sig = tsk->signal;
+ struct task_struct *t;
+
+ times->utime = sig->utime;
+ times->stime = sig->stime;
+ times->sum_exec_runtime = sig->sum_sched_runtime;
+
+ rcu_read_lock();
+ /* make sure we can trust tsk->thread_group list */
+ if (!likely(pid_alive(tsk)))
+ goto out;
+
+ t = tsk;
+ do {
+ times->utime += t->utime;
+ times->stime += t->stime;
+ times->sum_exec_runtime += task_sched_runtime(t);
+ } while_each_thread(tsk, t);
+out:
+ rcu_read_unlock();
+}
+
#ifndef CONFIG_VIRT_CPU_ACCOUNTING
#ifdef CONFIG_IRQ_TIME_ACCOUNTING