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    Subject[PATCH 09/40] autonuma: introduce kthread_bind_node()
    Date
    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 +
    include/linux/sched.h | 2 +-
    kernel/kthread.c | 23 +++++++++++++++++++++++
    3 files changed, 25 insertions(+), 1 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/include/linux/sched.h b/include/linux/sched.h
    index 4059c0f..699324c 100644
    --- a/include/linux/sched.h
    +++ b/include/linux/sched.h
    @@ -1792,7 +1792,7 @@ extern void thread_group_times(struct task_struct *p, cputime_t *ut, cputime_t *
    #define PF_SWAPWRITE 0x00800000 /* Allowed to write to swap */
    #define PF_SPREAD_PAGE 0x01000000 /* Spread page cache over cpuset */
    #define PF_SPREAD_SLAB 0x02000000 /* Spread some slab caches over cpuset */
    -#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpu */
    +#define PF_THREAD_BOUND 0x04000000 /* Thread bound to specific cpus */
    #define PF_MCE_EARLY 0x08000000 /* Early kill for mce process policy */
    #define PF_MEMPOLICY 0x10000000 /* Non-default NUMA mempolicy */
    #define PF_MUTEX_TESTER 0x20000000 /* Thread belongs to the rt mutex tester */
    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().
    *

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