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| author | Frederic Weisbecker <fweisbec@gmail.com> | 2012-11-21 15:55:59 +0100 |
|---|---|---|
| committer | Frederic Weisbecker <fweisbec@gmail.com> | 2012-11-28 17:07:38 +0100 |
| commit | a634f93335daa8f38180a0e576ccd68a73c36eaf (patch) | |
| tree | 19cb10ec27da81bd07a3eec1b4d4e9f814402c3a /kernel/sched | |
| parent | Merge branch 'sched/urgent' into sched/core (diff) | |
| download | linux-a634f93335daa8f38180a0e576ccd68a73c36eaf.tar.xz linux-a634f93335daa8f38180a0e576ccd68a73c36eaf.zip | |
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.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/kernel/sched/cputime.c b/kernel/sched/cputime.c index 8d859dae5bed..e56f138a23c7 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 |