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| author | Peter Williams <pwil3058@bigpond.net.au> | 2009-09-21 01:31:53 +0000 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2009-09-21 09:53:55 +0200 |
| commit | 0d721ceadbeaa24d7f9dd41b3e5e29912327a7e1 (patch) | |
| tree | 54c0c8dc201122483bdd7e8975103b07f6afd34b /kernel/sched_fair.c | |
| parent | cb5fd13f1178dee4302646b2890d884c380160e1 (diff) | |
| download | lwn-0d721ceadbeaa24d7f9dd41b3e5e29912327a7e1.tar.gz lwn-0d721ceadbeaa24d7f9dd41b3e5e29912327a7e1.zip | |
sched: Simplify sys_sched_rr_get_interval() system call
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>
Diffstat (limited to 'kernel/sched_fair.c')
| -rw-r--r-- | kernel/sched_fair.c | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/kernel/sched_fair.c b/kernel/sched_fair.c index 566e3bb78ed9..cd73738f0d5f 100644 --- a/kernel/sched_fair.c +++ b/kernel/sched_fair.c @@ -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 |