diff options
| author | Neil Zhang | 2013-04-11 15:04:59 +0200 |
|---|---|---|
| committer | Ingo Molnar | 2013-05-28 09:40:22 +0200 |
| commit | c5405a495e88d93cf9b4f4cc91507c7f4afcb901 (patch) | |
| tree | c0d33303fb9162c610c5a0f0bc108f746d1e1b69 /kernel/sched | |
| parent | sched/autogroup: Fix race with task_groups list (diff) | |
| download | kernel-qcow2-linux-c5405a495e88d93cf9b4f4cc91507c7f4afcb901.tar.gz kernel-qcow2-linux-c5405a495e88d93cf9b4f4cc91507c7f4afcb901.tar.xz kernel-qcow2-linux-c5405a495e88d93cf9b4f4cc91507c7f4afcb901.zip | |
sched: Remove redundant update_runtime notifier
migration_call() will do all the things that update_runtime() does.
So let's remove it.
Furthermore, there is potential risk that the current code will catch
BUG_ON at line 689 of rt.c when do cpu hotplug while there are realtime
threads running because of enabling runtime twice while the rt_runtime
may already changed.
Signed-off-by: Neil Zhang <zhangwm@marvell.com>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Link: http://lkml.kernel.org/r/1365685499-26515-1-git-send-email-zhangwm@marvell.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Diffstat (limited to 'kernel/sched')
| -rw-r--r-- | kernel/sched/core.c | 3 | ||||
| -rw-r--r-- | kernel/sched/rt.c | 40 | ||||
| -rw-r--r-- | kernel/sched/sched.h | 1 |
3 files changed, 0 insertions, 44 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index bfa7e77e0b50..79e48e6a9385 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -6285,9 +6285,6 @@ void __init sched_init_smp(void) hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE); hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE); - /* RT runtime code needs to handle some hotplug events */ - hotcpu_notifier(update_runtime, 0); - init_hrtick(); /* Move init over to a non-isolated CPU */ diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 7aced2e3b085..8853ab17b750 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -699,15 +699,6 @@ balanced: } } -static void disable_runtime(struct rq *rq) -{ - unsigned long flags; - - raw_spin_lock_irqsave(&rq->lock, flags); - __disable_runtime(rq); - raw_spin_unlock_irqrestore(&rq->lock, flags); -} - static void __enable_runtime(struct rq *rq) { rt_rq_iter_t iter; @@ -732,37 +723,6 @@ static void __enable_runtime(struct rq *rq) } } -static void enable_runtime(struct rq *rq) -{ - unsigned long flags; - - raw_spin_lock_irqsave(&rq->lock, flags); - __enable_runtime(rq); - raw_spin_unlock_irqrestore(&rq->lock, flags); -} - -int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu) -{ - int cpu = (int)(long)hcpu; - - switch (action) { - case CPU_DOWN_PREPARE: - case CPU_DOWN_PREPARE_FROZEN: - disable_runtime(cpu_rq(cpu)); - return NOTIFY_OK; - - case CPU_DOWN_FAILED: - case CPU_DOWN_FAILED_FROZEN: - case CPU_ONLINE: - case CPU_ONLINE_FROZEN: - enable_runtime(cpu_rq(cpu)); - return NOTIFY_OK; - - default: - return NOTIFY_DONE; - } -} - static int balance_runtime(struct rt_rq *rt_rq) { int more = 0; diff --git a/kernel/sched/sched.h b/kernel/sched/sched.h index f1f6256c1224..c806c61a1261 100644 --- a/kernel/sched/sched.h +++ b/kernel/sched/sched.h @@ -1041,7 +1041,6 @@ static inline void idle_balance(int cpu, struct rq *rq) extern void sysrq_sched_debug_show(void); extern void sched_init_granularity(void); extern void update_max_interval(void); -extern int update_runtime(struct notifier_block *nfb, unsigned long action, void *hcpu); extern void init_sched_rt_class(void); extern void init_sched_fair_class(void); |