cputime: Use accessors to read task cputime stats

This is in preparation for the full dynticks feature. While
remotely reading the cputime of a task running in a full
dynticks CPU, we'll need to do some extra-computation. This
way we can account the time it spent tickless in userspace
since its last cputime snapshot.

Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Li Zhong <zhong@linux.vnet.ibm.com>
Cc: Namhyung Kim <namhyung.kim@lge.com>
Cc: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>

1 files changed, 23 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 6fc8f45de4e9..a9c608b6154e 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1792,6 +1792,29 @@ static inline void put_task_struct(struct task_struct *t)
                 __put_task_struct(t);
 }
 
+static inline cputime_t task_gtime(struct task_struct *t)
+{
+        return t->gtime;
+}
+
+static inline void task_cputime(struct task_struct *t,
+                                cputime_t *utime, cputime_t *stime)
+{
+        if (utime)
+                *utime = t->utime;
+        if (stime)
+                *stime = t->stime;
+}
+
+static inline void task_cputime_scaled(struct task_struct *t,
+                                       cputime_t *utimescaled,
+                                       cputime_t *stimescaled)
+{
+        if (utimescaled)
+                *utimescaled = t->utimescaled;
+        if (stimescaled)
+                *stimescaled = t->stimescaled;
+}
 extern void task_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);
 extern void thread_group_cputime_adjusted(struct task_struct *p, cputime_t *ut, cputime_t *st);