[PATCH 08/35] autonuma: introduce kthread_bind_node()

Andrea Arcangeli
2012-05-25T17:07:54Z

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@redhat.com>
---
include/linux/kthread.h | 1 +
kernel/kthread.c | 23 +++++++++++++++++++++++
2 files changed, 24 insertions(+), 0 deletions(-)

diff --git a/include/linux/kthread.h b/include/linux/kthread.h
index 0714b24..e733f97 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 3d3de63..48b36f9 100644
--- a/kernel/kthread.c
+++ b/kernel/kthread.c
@@ -234,6 +234,29 @@ 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));
+ p->flags |= PF_THREAD_BOUND;
+}
+EXPORT_SYMBOL(kthread_bind_node);
+
+/**
* kthread_stop - stop a thread created by kthread_create().
* @k: thread created by kthread_create().
*