From f83f9ac2632732bd1678150b5a03d152f912fe72 Mon Sep 17 00:00:00 2001 From: Peter Williams Date: Thu, 24 Sep 2009 06:47:10 +0000 Subject: [PATCH] sched: Set correct normal_prio and prio values in sched_fork() normal_prio should be updated if policy changes from RT to SCHED_MORMAL or if static_prio/nice is changed. Some paths through sched_fork() ignore this requirement and may result in normal_prio having an invalid value. Fixing this issue allows the call to effective_prio() in wake_up_new_task() to be removed. Signed-off-by: Peter Williams Acked-by: Peter Zijlstra Cc: Mike Galbraith LKML-Reference: Signed-off-by: Ingo Molnar --- kernel/sched.c | 20 +++++++++----------- 1 file changed, 9 insertions(+), 11 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index 1535f3884b8..76c0e9691fc 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -2514,23 +2514,18 @@ void sched_fork(struct task_struct *p, int clone_flags) __sched_fork(p); - /* - * Make sure we do not leak PI boosting priority to the child. - */ - p->prio = current->normal_prio; - /* * Revert to default priority/policy on fork if requested. */ if (unlikely(p->sched_reset_on_fork)) { - if (p->policy == SCHED_FIFO || p->policy == SCHED_RR) + if (p->policy == SCHED_FIFO || p->policy == SCHED_RR) { p->policy = SCHED_NORMAL; - - if (p->normal_prio < DEFAULT_PRIO) - p->prio = DEFAULT_PRIO; + p->normal_prio = p->static_prio; + } if (PRIO_TO_NICE(p->static_prio) < 0) { p->static_prio = NICE_TO_PRIO(0); + p->normal_prio = p->static_prio; set_load_weight(p); } @@ -2541,6 +2536,11 @@ void sched_fork(struct task_struct *p, int clone_flags) p->sched_reset_on_fork = 0; } + /* + * Make sure we do not leak PI boosting priority to the child. + */ + p->prio = current->normal_prio; + if (!rt_prio(p->prio)) p->sched_class = &fair_sched_class; @@ -2581,8 +2581,6 @@ void wake_up_new_task(struct task_struct *p, unsigned long clone_flags) BUG_ON(p->state != TASK_RUNNING); update_rq_clock(rq); - p->prio = effective_prio(p); - if (!p->sched_class->task_new || !current->se.on_rq) { activate_task(rq, p, 0); } else {