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authorPeter Zijlstra <a.p.zijlstra@chello.nl>2009-12-04 09:59:02 +0100
committerIngo Molnar <mingo@elte.hu>2009-12-09 10:03:10 +0100
commit57785df5ac53c70da9fb53696130f3c551bfe1f9 (patch)
tree5653c894d74a1555f480835b013fdb7b512f8b69 /kernel/sched.c
parentcd8ad40de36c2fe75f3b731bd70198b385895246 (diff)
sched: Fix task priority bug
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>
Diffstat (limited to 'kernel/sched.c')
-rw-r--r--kernel/sched.c6
1 files changed, 0 insertions, 6 deletions
diff --git a/kernel/sched.c b/kernel/sched.c
index 71eb0622f548..3878f5018007 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -3158,10 +3158,6 @@ 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);
}
@@ -6992,7 +6988,6 @@ 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);
@@ -7696,7 +7691,6 @@ 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);