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sched: Make set_cpu_rq_start_time() a built in hotplug state 

Start distangling the maze of hotplug notifiers in the scheduler.

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 12:54:09 +01:00
parent e9d867a67f
commit 9cf7243d5d
4 changed files with 17 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
include/linux/cpuhotplug.h
View File

@ -8,6 +8,7 @@ enum cpuhp_state {
CPUHP_BRINGUP_CPU,
CPUHP_AP_IDLE_DEAD,
CPUHP_AP_OFFLINE,
CPUHP_AP_SCHED_STARTING,
CPUHP_AP_NOTIFY_STARTING,
CPUHP_AP_ONLINE,
CPUHP_TEARDOWN_CPU,

1
include/linux/sched.h
View File

@ -372,6 +372,7 @@ extern void cpu_init (void);
extern void trap_init(void);
extern void update_process_times(int user);
extern void scheduler_tick(void);
extern int sched_cpu_starting(unsigned int cpu);
extern void sched_show_task(struct task_struct *p);

6
kernel/cpu.c
View File

@ -1236,6 +1236,12 @@ static struct cpuhp_step cpuhp_ap_states[] = {
.name = "ap:offline",
.cant_stop = true,
},
/* First state is scheduler control. Interrupts are disabled */
[CPUHP_AP_SCHED_STARTING] = {
.name = "sched:starting",
.startup = sched_cpu_starting,
.teardown = NULL,
},
/*
* Low level startup/teardown notifiers. Run with interrupts
* disabled. Will be removed once the notifiers are converted to

16
kernel/sched/core.c
View File

@ -5473,10 +5473,10 @@ static struct notifier_block migration_notifier = {
.priority = CPU_PRI_MIGRATION,
};
static void set_cpu_rq_start_time(void)
static void set_cpu_rq_start_time(unsigned int cpu)
{
int cpu = smp_processor_id();
struct rq *rq = cpu_rq(cpu);
rq->age_stamp = sched_clock_cpu(cpu);
}
@ -5486,10 +5486,6 @@ static int sched_cpu_active(struct notifier_block *nfb,
int cpu = (long)hcpu;
switch (action & ~CPU_TASKS_FROZEN) {
case CPU_STARTING:
set_cpu_rq_start_time();
return NOTIFY_OK;
case CPU_DOWN_FAILED:
set_cpu_active(cpu, true);
return NOTIFY_OK;
@ -5511,6 +5507,12 @@ static int sched_cpu_inactive(struct notifier_block *nfb,
}
}
int sched_cpu_starting(unsigned int cpu)
{
set_cpu_rq_start_time(cpu);
return 0;
}
static int __init migration_init(void)
{
void *cpu = (void *)(long)smp_processor_id();
@ -7426,7 +7428,7 @@ void __init sched_init(void)
if (cpu_isolated_map == NULL)
zalloc_cpumask_var(&cpu_isolated_map, GFP_NOWAIT);
idle_thread_set_boot_cpu();
set_cpu_rq_start_time();
set_cpu_rq_start_time(smp_processor_id());
#endif
init_sched_fair_class();