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cputime: Use accessors to read task cputime stats

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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>
This commit is contained in:
Frederic Weisbecker
2012-11-13 14:20:55 +01:00
parent 3f4724ea85
commit 6fac4829ce
16 changed files with 144 additions and 49 deletions
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23
include/linux/sched.h
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@@ -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);