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| author | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 02:28:54 +0100 |
|---|---|---|
| committer | Marcelo Tosatti <mtosatti@redhat.com> | 2012-11-28 02:29:09 +0100 |
| commit | 582b336ec2c0f0076f5650a029fcc9abd4a906f7 (patch) | |
| tree | 4827fe468a1aac8be0227cac5bab922b32c2facc /kernel | |
| parent | x86: pvclock: add note about rdtsc barriers (diff) | |
| download | linux-582b336ec2c0f0076f5650a029fcc9abd4a906f7.tar.xz linux-582b336ec2c0f0076f5650a029fcc9abd4a906f7.zip | |
sched: add notifier for cross-cpu migrations
Originally from Jeremy Fitzhardinge.
Acked-by: Ingo Molnar <mingo@redhat.com>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/sched/core.c | 15 |
1 files changed, 15 insertions, 0 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 2d8927fda712..c86b8b6e70f4 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -922,6 +922,13 @@ void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags) 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, unsigned int new_cpu) 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); |