On 11/01/2012 02:47 AM, Marcelo Tosatti wrote:
> Originally from Jeremy Fitzhardinge.
>
> Signed-off-by: Marcelo Tosatti <mtosatti@xxxxxxxxxx>
>
Please collect peterz's ack for this one.
> Index: vsyscall/include/linux/sched.h
> ===================================================================
> --- vsyscall.orig/include/linux/sched.h
> +++ vsyscall/include/linux/sched.h
> @@ -107,6 +107,14 @@ extern unsigned long this_cpu_load(void)
> extern void calc_global_load(unsigned long ticks);
> extern void update_cpu_load_nohz(void);
>
> +/* Notifier for when a task gets migrated to a new CPU */
> +struct task_migration_notifier {
> + struct task_struct *task;
> + int from_cpu;
> + int to_cpu;
> +};
> +extern void register_task_migration_notifier(struct notifier_block *n);
> +
> extern unsigned long get_parent_ip(unsigned long addr);
>
> struct seq_file;
> Index: vsyscall/kernel/sched/core.c
> ===================================================================
> --- vsyscall.orig/kernel/sched/core.c
> +++ vsyscall/kernel/sched/core.c
> @@ -922,6 +922,13 @@ void check_preempt_curr(struct rq *rq, s
> rq->skip_clock_update = 1;
> }
>
> +static ATOMIC_NOTIFIER_HEAD(task_migration_notifier);
> +
> +void register_task_migration_notifier(struct notifier_block *n)
> +{
> + atomic_notifier_chain_register(&task_migration_notifier, n);
> +}
> +
> #ifdef CONFIG_SMP
> void set_task_cpu(struct task_struct *p, unsigned int new_cpu)
> {
> @@ -952,8 +959,16 @@ void set_task_cpu(struct task_struct *p,
> trace_sched_migrate_task(p, new_cpu);
>
> if (task_cpu(p) != new_cpu) {
> + struct task_migration_notifier tmn;
> +
> p->se.nr_migrations++;
> perf_sw_event(PERF_COUNT_SW_CPU_MIGRATIONS, 1, NULL, 0);
> +
> + tmn.task = p;
> + tmn.from_cpu = task_cpu(p);
> + tmn.to_cpu = new_cpu;
> +
> + atomic_notifier_call_chain(&task_migration_notifier, 0, &tmn);
> }
>
> __set_task_cpu(p, new_cpu);
>
>
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