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sched: Simplify sys_sched_rr_get_interval() system call

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By removing the need for it to know details of scheduling classes.

This allows PlugSched to define orthogonal scheduling classes.

Signed-off-by: Peter Williams <pwil3058@bigpond.net.au>
Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Mike Galbraith <efault@gmx.de>
LKML-Reference: <06d1b89ee15a0eef82d7.1253496713@mudlark.pw.nest>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Peter Williams
2009-09-21 01:31:53 +00:00
committed by Ingo Molnar
parent cb5fd13f11
commit 0d721ceadb
5 changed files with 44 additions and 16 deletions
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21
kernel/sched_fair.c
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@ -1938,6 +1938,25 @@ static void moved_group_fair(struct task_struct *p)
}
#endif
unsigned int get_rr_interval_fair(struct task_struct *task)
{
struct sched_entity *se = &task->se;
unsigned long flags;
struct rq *rq;
unsigned int rr_interval = 0;
/*
* Time slice is 0 for SCHED_OTHER tasks that are on an otherwise
* idle runqueue:
*/
rq = task_rq_lock(task, &flags);
if (rq->cfs.load.weight)
rr_interval = NS_TO_JIFFIES(sched_slice(&rq->cfs, se));
task_rq_unlock(rq, &flags);
return rr_interval;
}
/*
* All the scheduling class methods:
*/
@ -1966,6 +1985,8 @@ static const struct sched_class fair_sched_class = {
.prio_changed = prio_changed_fair,
.switched_to = switched_to_fair,
.get_rr_interval = get_rr_interval_fair,
#ifdef CONFIG_FAIR_GROUP_SCHED
.moved_group = moved_group_fair,
#endif