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Commit de5bdff7 authored by Hiroshi Shimamoto's avatar Hiroshi Shimamoto Committed by Ingo Molnar
Browse files

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: default avatarHiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
[ s/DEF_TIMESLICE/RR_TIMESLICE/g ]
Signed-off-by: default avatarPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/4F3C9995.3010800@ct.jp.nec.com


Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 62f6536a

include/linux/init_task.h

+1 −1
Original line number Diff line number Diff line
@@ -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),			\

include/linux/sched.h

+6 −0
Original line number Diff line number Diff line
@@ -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 {

kernel/sched/rt.c

+2 −2
Original line number Diff line number Diff line
@@ -1972,7 +1972,7 @@ static void task_tick_rt(struct rq *rq, struct task_struct *p, int queued) 
	if (--p->rt.time_slice)

		return;



	p->rt.time_slice = DEF_TIMESLICE;

	p->rt.time_slice = RR_TIMESLICE;



	/*

	 * Requeue to the end of queue if we are not the only element
@@ -2000,7 +2000,7 @@ static unsigned int get_rr_interval_rt(struct rq *rq, struct task_struct *task) 
	 * Time slice is 0 for SCHED_FIFO tasks

	 */

	if (task->policy == SCHED_RR)

		return DEF_TIMESLICE;

		return RR_TIMESLICE;

	else

		return 0;

}

kernel/sched/sched.h

+0 −4
Original line number Diff line number Diff line
@@ -36,11 +36,7 @@ extern __read_mostly int scheduler_running; 


/*

 * These are the 'tuning knobs' of the scheduler:

 *

 * default timeslice is 100 msecs (used only for SCHED_RR tasks).

 * Timeslices get refilled after they expire.

 */

#define DEF_TIMESLICE		(100 * HZ / 1000)



/*

 * single value that denotes runtime == period, ie unlimited time.