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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2011-01-17 17:03:27 +0100
committerIngo Molnar <mingo@elte.hu>2011-01-26 12:33:22 +0100
commitda7a735e51f9622eb3e1672594d4a41da01d7e4f (patch)
tree27623dcd39c52a80b79e0ee86ab426fc9c7e2b46 /kernel/sched_stoptask.c
parenta8941d7ec81678fb69aea7183338175f112f3e0d (diff)
sched: Fix switch_from_fair()
When a task is taken out of the fair class we must ensure the vruntime is properly normalized because when we put it back in it will assume to be normalized. The case that goes wrong is when changing away from the fair class while sleeping. Sleeping tasks have non-normalized vruntime in order to make sleeper-fairness work. So treat the switch away from fair as a wakeup and preserve the relative vruntime. Also update sysrq-n to call the ->switch_{to,from} methods. Reported-by: Onkalo Samu <samu.p.onkalo@nokia.com> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <new-submission> Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/sched_stoptask.c')
-rw-r--r--kernel/sched_stoptask.c7
1 files changed, 3 insertions, 4 deletions
diff --git a/kernel/sched_stoptask.c b/kernel/sched_stoptask.c
index 2bf6b47058c1..84ec9bcf82d9 100644
--- a/kernel/sched_stoptask.c
+++ b/kernel/sched_stoptask.c
@@ -59,14 +59,13 @@ static void set_curr_task_stop(struct rq *rq)
{
}
-static void switched_to_stop(struct rq *rq, struct task_struct *p,
- int running)
+static void switched_to_stop(struct rq *rq, struct task_struct *p)
{
BUG(); /* its impossible to change to this class */
}
-static void prio_changed_stop(struct rq *rq, struct task_struct *p,
- int oldprio, int running)
+static void
+prio_changed_stop(struct rq *rq, struct task_struct *p, int oldprio)
{
BUG(); /* how!?, what priority? */
}