[PATCH 06/36] autonuma: introduce kthread_bind_node()

[Andrea Arcangeli <aarcange@xxxxxxxxxx>]

This function makes it easy to bind the per-node knuma_migrated
threads to their respective NUMA nodes. Those threads take memory from
the other nodes (in round robin with a incoming queue for each remote
node) and they move that memory to their local node.

Signed-off-by: Andrea Arcangeli <aarcange@xxxxxxxxxx>
---
 include/linux/kthread.h |    1 +
 kernel/kthread.c        |   21 +++++++++++++++++++++
 2 files changed, 22 insertions(+), 0 deletions(-)

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 22ccf9d..5901aad 100644
--- a/include/linux/kthread.h
+++ b/include/linux/kthread.h
@@ -33,6 +33,7 @@ struct task_struct *kthread_create_on_node(int (*threadfn)(void *data),
 })
 
 void kthread_bind(struct task_struct *k, unsigned int cpu);
+void kthread_bind_node(struct task_struct *p, int nid);
 int kthread_stop(struct task_struct *k);
 int kthread_should_stop(void);
 bool kthread_freezable_should_stop(bool *was_frozen);
diff --git a/kernel/kthread.c b/kernel/kthread.c
index b579af5..0034e5f 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -234,6 +234,27 @@ void kthread_bind(struct task_struct *p, unsigned int cpu)
 EXPORT_SYMBOL(kthread_bind);
 
 /**
+ * kthread_bind_node - bind a just-created kthread to the CPUs of a node.
+ * @p: thread created by kthread_create().
+ * @nid: node (might not be online, must be possible) for @k to run on.
+ *
+ * Description: This function is equivalent to set_cpus_allowed(),
+ * except that @nid doesn't need to be online, and the thread must be
+ * stopped (i.e., just returned from kthread_create()).
+ */
+void kthread_bind_node(struct task_struct *p, int nid)
+{
+	/* Must have done schedule() in kthread() before we set_task_cpu */
+	if (!wait_task_inactive(p, TASK_UNINTERRUPTIBLE)) {
+		WARN_ON(1);
+		return;
+	}
+
+	/* It's safe because the task is inactive. */
+	do_set_cpus_allowed(p, cpumask_of_node(nid));
+}
+
+/**
  * kthread_stop - stop a thread created by kthread_create().
  * @k: thread created by kthread_create().
  *
--
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