| Message ID | 20121115000944.314380745@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
CCing Peter and Ingo. On Wed, Nov 14, 2012 at 10:08:31PM -0200, Marcelo Tosatti wrote: > Originally from Jeremy Fitzhardinge. > > Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> > > 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); > -- Gleb. -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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);
Originally from Jeremy Fitzhardinge. Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html