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authorPeter Williams <pwil3058@bigpond.net.au>2009-09-21 01:31:53 +0000
committerIngo Molnar <mingo@elte.hu>2009-09-21 09:53:55 +0200
commit0d721ceadbeaa24d7f9dd41b3e5e29912327a7e1 (patch)
tree54c0c8dc201122483bdd7e8975103b07f6afd34b /kernel/sched.c
parentcb5fd13f1178dee4302646b2890d884c380160e1 (diff)
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.c')
-rw-r--r--kernel/sched.c17
1 files changed, 1 insertions, 16 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 1b900fb1c6e..830967e1828 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -6819,23 +6819,8 @@ SYSCALL_DEFINE2(sched_rr_get_interval, pid_t, pid,
if (retval)
goto out_unlock;
- /*
- * Time slice is 0 for SCHED_FIFO tasks and for SCHED_OTHER
- * tasks that are on an otherwise idle runqueue:
- */
- time_slice = 0;
- if (p->policy == SCHED_RR) {
- time_slice = DEF_TIMESLICE;
- } else if (p->policy != SCHED_FIFO) {
- struct sched_entity *se = &p->se;
- unsigned long flags;
- struct rq *rq;
+ time_slice = p->sched_class->get_rr_interval(p);
- rq = task_rq_lock(p, &flags);
- if (rq->cfs.load.weight)
- time_slice = NS_TO_JIFFIES(sched_slice(&rq->cfs, se));
- task_rq_unlock(rq, &flags);
- }
read_unlock(&tasklist_lock);
jiffies_to_timespec(time_slice, &t);
retval = copy_to_user(interval, &t, sizeof(t)) ? -EFAULT : 0;