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authorLinus Torvalds <torvalds@linux-foundation.org>2015-04-30 09:44:04 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2015-04-30 09:44:04 -0700
commit9dbbe3cfc3c208643cf0e81c8f660f43e1b4b2e8 (patch)
tree5cdbb012652ac68fc09170354a785d94d5192079 /kernel
parentfb45f493c18b5bf0818394662f908d648060310c (diff)
parent73459e2a1ada09a68c02cc5b73f3116fc8194b3d (diff)
Merge tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm
Pull kvm changes from Paolo Bonzini: "Remove from guest code the handling of task migration during a pvclock read; instead use the correct protocol in KVM. This removes the need for task migration notifiers in core scheduler code" [ The scheduler people really hated the migration notifiers, so this was kind of required - Linus ] * tag 'for-linus' of git://git.kernel.org/pub/scm/virt/kvm/kvm: x86: pvclock: Really remove the sched notifier for cross-cpu migrations kvm: x86: fix kvmclock update protocol
Diffstat (limited to 'kernel')
-rw-r--r--kernel/sched/core.c15
1 files changed, 0 insertions, 15 deletions
diff --git a/kernel/sched/core.c b/kernel/sched/core.c
index f9123a82cbb6..fe22f7510bce 100644
--- a/kernel/sched/core.c
+++ b/kernel/sched/core.c
@@ -1016,13 +1016,6 @@ void check_preempt_curr(struct rq *rq, struct task_struct *p, int flags)
rq_clock_skip_update(rq, true);
}
-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)
{
@@ -1053,18 +1046,10 @@ 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;
-
if (p->sched_class->migrate_task_rq)
p->sched_class->migrate_task_rq(p, new_cpu);
p->se.nr_migrations++;
perf_sw_event_sched(PERF_COUNT_SW_CPU_MIGRATIONS, 1, 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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