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sched: Allow hotplug notifiers to be setup early 

Prevent the SMP scheduler related notifiers to be executed before the smp
scheduler is initialized and install them early.

This is a preparatory change for further consolidation of the hotplug notifier
maze.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Acked-by: Peter Zijlstra <peterz@infradead.org>
Cc: rt@linutronix.de
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Thomas Gleixner 2016-03-10 12:54:10 +01:00
parent 9cf7243d5d
commit e26fbffd32
1 changed files with 36 additions and 23 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

59
kernel/sched/core.c
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@ -5195,6 +5195,8 @@ out:
#ifdef CONFIG_SMP
static bool sched_smp_initialized __read_mostly;
#ifdef CONFIG_NUMA_BALANCING
/* Migrate current task p to target_cpu */
int migrate_task_to(struct task_struct *p, int target_cpu)
@ -5513,25 +5515,6 @@ int sched_cpu_starting(unsigned int cpu)
return 0;
}
static int __init migration_init(void)
{
void *cpu = (void *)(long)smp_processor_id();
int err;
/* Initialize migration for the boot CPU */
err = migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
BUG_ON(err == NOTIFY_BAD);
migration_call(&migration_notifier, CPU_ONLINE, cpu);
register_cpu_notifier(&migration_notifier);
/* Register cpu active notifiers */
cpu_notifier(sched_cpu_active, CPU_PRI_SCHED_ACTIVE);
cpu_notifier(sched_cpu_inactive, CPU_PRI_SCHED_INACTIVE);
return 0;
}
early_initcall(migration_init);
static cpumask_var_t sched_domains_tmpmask; /* sched_domains_mutex */
#ifdef CONFIG_SCHED_DEBUG
@ -6711,6 +6694,9 @@ static int sched_domains_numa_masks_update(struct notifier_block *nfb,
{
int cpu = (long)hcpu;
if (!sched_smp_initialized)
return NOTIFY_DONE;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_ONLINE:
sched_domains_numa_masks_set(cpu);
@ -7129,6 +7115,9 @@ static int num_cpus_frozen; /* used to mark begin/end of suspend/resume */
static int cpuset_cpu_active(struct notifier_block *nfb, unsigned long action,
void *hcpu)
{
if (!sched_smp_initialized)
return NOTIFY_DONE;
switch (action) {
case CPU_ONLINE_FROZEN:
case CPU_DOWN_FAILED_FROZEN:
@ -7169,6 +7158,9 @@ static int cpuset_cpu_inactive(struct notifier_block *nfb, unsigned long action,
bool overflow;
int cpus;
if (!sched_smp_initialized)
return NOTIFY_DONE;
switch (action) {
case CPU_DOWN_PREPARE:
rcu_read_lock_sched();
@ -7216,10 +7208,6 @@ void __init sched_init_smp(void)
cpumask_set_cpu(smp_processor_id(), non_isolated_cpus);
mutex_unlock(&sched_domains_mutex);
hotcpu_notifier(sched_domains_numa_masks_update, CPU_PRI_SCHED_ACTIVE);
hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
init_hrtick();
/* Move init over to a non-isolated CPU */
@ -7230,7 +7218,32 @@ void __init sched_init_smp(void)
init_sched_rt_class();
init_sched_dl_class();
sched_smp_initialized = true;
}
static int __init migration_init(void)
{
void *cpu = (void *)(long)smp_processor_id();
int err;
/* Initialize migration for the boot CPU */
err = migration_call(&migration_notifier, CPU_UP_PREPARE, cpu);
BUG_ON(err == NOTIFY_BAD);
migration_call(&migration_notifier, CPU_ONLINE, cpu);
register_cpu_notifier(&migration_notifier);
/* Register cpu active notifiers */
cpu_notifier(sched_cpu_active, CPU_PRI_SCHED_ACTIVE);
cpu_notifier(sched_cpu_inactive, CPU_PRI_SCHED_INACTIVE);
hotcpu_notifier(sched_domains_numa_masks_update, CPU_PRI_SCHED_ACTIVE);
hotcpu_notifier(cpuset_cpu_active, CPU_PRI_CPUSET_ACTIVE);
hotcpu_notifier(cpuset_cpu_inactive, CPU_PRI_CPUSET_INACTIVE);
return 0;
}
early_initcall(migration_init);
#else
void __init sched_init_smp(void)
{