sched: Make initial SCHED_RR timeslace DEF_TIMESLICE

Current the initial SCHED_RR timeslice of init_task is HZ, which means
1s, and is not same as the default SCHED_RR timeslice DEF_TIMESLICE.

Change that initial timeslice to the DEF_TIMESLICE.

Signed-off-by: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
[ s/DEF_TIMESLICE/RR_TIMESLICE/g ]
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4F3C9995.3010800@ct.jp.nec.com
Signed-off-by: Ingo Molnar <mingo@elte.hu>

2 files changed, 7 insertions, 1 deletions

diff --git a/include/linux/init_task.h b/include/linux/init_task.h
index 9c66b1ada9d7..f994d51f70f2 100644
--- a/include/linux/init_task.h
+++ b/include/linux/init_task.h
@@ -149,7 +149,7 @@ extern struct cred init_cred;
         },                                                              \
         .rt             = {                                             \
                 .run_list       = LIST_HEAD_INIT(tsk.rt.run_list),      \
-                .time_slice     = HZ,                                   \
+                .time_slice     = RR_TIMESLICE,                         \
                 .nr_cpus_allowed = NR_CPUS,                             \
         },                                                              \
         .tasks          = LIST_HEAD_INIT(tsk.tasks),                    \
diff --git a/include/linux/sched.h b/include/linux/sched.h
index 5dba2ad52431..eb5de466f099 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1234,6 +1234,12 @@ struct sched_rt_entity {
 #endif
 };
 
+/*
+ * default timeslice is 100 msecs (used only for SCHED_RR tasks).
+ * Timeslices get refilled after they expire.
+ */
+#define RR_TIMESLICE            (100 * HZ / 1000)
+
 struct rcu_node;
 
 enum perf_event_task_context {