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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-12-04 09:59:02 +0100
committerGreg Kroah-Hartman <gregkh@suse.de>2010-01-22 15:18:40 -0800
commit26931397cc71bcac187efdcd2fc43ce0d41e4eb0 (patch)
tree69a4791241701822c67a601454f3e54b5e02009e
parentfdc360e9cd88b119fa978cc812d1f0be69087f9a (diff)
sched: Fix task priority bug
commit 57785df5ac53c70da9fb53696130f3c551bfe1f9 upstream. 83f9ac removed a call to effective_prio() in wake_up_new_task(), which leads to tasks running at MAX_PRIO. This is caused by the idle thread being set to MAX_PRIO before forking off init. O(1) used that to make sure idle was always preempted, CFS uses check_preempt_curr_idle() for that so we can savely remove this bit of legacy code. Reported-by: Mike Galbraith <efault@gmx.de> Tested-by: Mike Galbraith <efault@gmx.de> Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <1259754383.4003.610.camel@laptop> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
-rw-r--r--kernel/sched.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index dd0dccde5df0..bf841d85b9ba 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3177,10 +3177,6 @@ static void pull_task(struct rq *src_rq, struct task_struct *p,
deactivate_task(src_rq, p, 0);
set_task_cpu(p, this_cpu);
activate_task(this_rq, p, 0);
- /*
- * Note that idle threads have a prio of MAX_PRIO, for this test
- * to be always true for them.
- */
check_preempt_curr(this_rq, p, 0);
}
@@ -6982,7 +6978,6 @@ void __cpuinit init_idle(struct task_struct *idle, int cpu)
__sched_fork(idle);
idle->se.exec_start = sched_clock();
- idle->prio = idle->normal_prio = MAX_PRIO;
cpumask_copy(&idle->cpus_allowed, cpumask_of(cpu));
__set_task_cpu(idle, cpu);
@@ -7686,7 +7681,6 @@ migration_call(struct notifier_block *nfb, unsigned long action, void *hcpu)
spin_lock_irq(&rq->lock);
update_rq_clock(rq);
deactivate_task(rq, rq->idle, 0);
- rq->idle->static_prio = MAX_PRIO;
__setscheduler(rq, rq->idle, SCHED_NORMAL, 0);
rq->idle->sched_class = &idle_sched_class;
migrate_dead_tasks(cpu);