sched/cputime, powerpc, s390: Make scaled cputime arch specific

Only s390 and powerpc have hardware facilities allowing to measure
cputimes scaled by frequency. On all other architectures
utimescaled/stimescaled are equal to utime/stime (however they are
accounted separately).

Remove {u,s}timescaled accounting on all architectures except
powerpc and s390, where those values are explicitly accounted
in the proper places.

Signed-off-by: Stanislaw Gruszka <sgruszka@redhat.com>
Signed-off-by: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
Cc: Michael Neuling <mikey@neuling.org>
Cc: Paul Mackerras <paulus@ozlabs.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161031162143.GB12646@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>

1 files changed, 17 insertions, 6 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 3762fe4e3a80..f72e81395dac 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1647,7 +1647,10 @@ struct task_struct {
         int __user *set_child_tid;              /* CLONE_CHILD_SETTID */
         int __user *clear_child_tid;            /* CLONE_CHILD_CLEARTID */
 
-        cputime_t utime, stime, utimescaled, stimescaled;
+        cputime_t utime, stime;
+#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
+        cputime_t utimescaled, stimescaled;
+#endif
         cputime_t gtime;
         struct prev_cputime prev_cputime;
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
@@ -2240,8 +2243,6 @@ struct task_struct *try_get_task_struct(struct task_struct **ptask);
 #ifdef CONFIG_VIRT_CPU_ACCOUNTING_GEN
 extern void task_cputime(struct task_struct *t,
                          cputime_t *utime, cputime_t *stime);
-extern void task_cputime_scaled(struct task_struct *t,
-                                cputime_t *utimescaled, cputime_t *stimescaled);
 extern cputime_t task_gtime(struct task_struct *t);
 #else
 static inline void task_cputime(struct task_struct *t,
@@ -2253,6 +2254,13 @@ static inline void task_cputime(struct task_struct *t,
                 *stime = t->stime;
 }
 
+static inline cputime_t task_gtime(struct task_struct *t)
+{
+        return t->gtime;
+}
+#endif
+
+#ifdef CONFIG_ARCH_HAS_SCALED_CPUTIME
 static inline void task_cputime_scaled(struct task_struct *t,
                                        cputime_t *utimescaled,
                                        cputime_t *stimescaled)
@@ -2262,12 +2270,15 @@ static inline void task_cputime_scaled(struct task_struct *t,
         if (stimescaled)
                 *stimescaled = t->stimescaled;
 }
-
-static inline cputime_t task_gtime(struct task_struct *t)
+#else
+static inline void task_cputime_scaled(struct task_struct *t,
+                                       cputime_t *utimescaled,
+                                       cputime_t *stimescaled)
 {
-        return t->gtime;
+        task_cputime(t, utimescaled, stimescaled);
 }
 #endif
+
 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);