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authorIngo Molnar <mingo@elte.hu>2010-01-13 09:58:37 +0100
committerIngo Molnar <mingo@elte.hu>2010-01-13 10:08:50 +0100
commit61405fea92c42d072d9b8bd189689f1502a838af (patch)
tree013ea3e7ed71f4114004d5852d40b6e89e128f76 /kernel/kthread.c
parent9c443dfdd31eddea6cbe6ee0ca469fbcc4e1dc3b (diff)
parent1703f2c321a8a531c393e137a82602e16c6061cb (diff)
Merge branch 'perf/urgent' into perf/core
Merge reason: queue up dependent patch, update to -rc4 Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'kernel/kthread.c')
-rw-r--r--kernel/kthread.c23
1 files changed, 23 insertions, 0 deletions
diff --git a/kernel/kthread.c b/kernel/kthread.c
index ab7ae57773e1..fbb6222fe7e0 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -150,6 +150,29 @@ struct task_struct *kthread_create(int (*threadfn)(void *data),
EXPORT_SYMBOL(kthread_create);
/**
+ * kthread_bind - bind a just-created kthread to a cpu.
+ * @p: thread created by kthread_create().
+ * @cpu: cpu (might not be online, must be possible) for @k to run on.
+ *
+ * Description: This function is equivalent to set_cpus_allowed(),
+ * except that @cpu doesn't need to be online, and the thread must be
+ * stopped (i.e., just returned from kthread_create()).
+ */
+void kthread_bind(struct task_struct *p, unsigned int cpu)
+{
+ /* Must have done schedule() in kthread() before we set_task_cpu */
+ if (!wait_task_inactive(p, TASK_UNINTERRUPTIBLE)) {
+ WARN_ON(1);
+ return;
+ }
+
+ p->cpus_allowed = cpumask_of_cpu(cpu);
+ p->rt.nr_cpus_allowed = 1;
+ p->flags |= PF_THREAD_BOUND;
+}
+EXPORT_SYMBOL(kthread_bind);
+
+/**
* kthread_stop - stop a thread created by kthread_create().
* @k: thread created by kthread_create().
*