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sched: Make initial SCHED_RR timeslace DEF_TIMESLICE

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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>
This commit is contained in:
Hiroshi Shimamoto 2012-02-16 14:52:21 +09:00 committed by Ingo Molnar
parent 62f6536a63
commit de5bdff7a7
4 changed files with 9 additions and 7 deletions
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2
include/linux/init_task.h
View File

@ -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), \

6
include/linux/sched.h
View File

@ -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 {

4
kernel/sched/rt.c
View File

@ -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;
}

4
kernel/sched/sched.h
View File

@ -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.