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    Subject[tip:sched/core] sched/numa: Increment numa_migrate_seq when task runs in correct location
    Commit-ID:  06ea5e035b4e66cc77790457a89fc7e368060c4b
    Gitweb: http://git.kernel.org/tip/06ea5e035b4e66cc77790457a89fc7e368060c4b
    Author: Rik van Riel <riel@redhat.com>
    AuthorDate: Mon, 7 Oct 2013 11:29:12 +0100
    Committer: Ingo Molnar <mingo@kernel.org>
    CommitDate: Wed, 9 Oct 2013 12:40:41 +0200

    sched/numa: Increment numa_migrate_seq when task runs in correct location

    When a task is already running on its preferred node, increment
    numa_migrate_seq to indicate that the task is settled if migration is
    temporarily disabled, and memory should migrate towards it.

    Signed-off-by: Rik van Riel <riel@redhat.com>
    [ Only increment migrate_seq if migration temporarily disabled. ]
    Signed-off-by: Mel Gorman <mgorman@suse.de>
    Cc: Andrea Arcangeli <aarcange@redhat.com>
    Cc: Johannes Weiner <hannes@cmpxchg.org>
    Cc: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
    Signed-off-by: Peter Zijlstra <peterz@infradead.org>
    Link: http://lkml.kernel.org/r/1381141781-10992-35-git-send-email-mgorman@suse.de
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    kernel/sched/fair.c | 10 +++++++++-
    1 file changed, 9 insertions(+), 1 deletion(-)

    diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
    index f84ac3f..de9b4d8 100644
    --- a/kernel/sched/fair.c
    +++ b/kernel/sched/fair.c
    @@ -1016,8 +1016,16 @@ static void numa_migrate_preferred(struct task_struct *p)
    {
    /* Success if task is already running on preferred CPU */
    p->numa_migrate_retry = 0;
    - if (cpu_to_node(task_cpu(p)) == p->numa_preferred_nid)
    + if (cpu_to_node(task_cpu(p)) == p->numa_preferred_nid) {
    + /*
    + * If migration is temporarily disabled due to a task migration
    + * then re-enable it now as the task is running on its
    + * preferred node and memory should migrate locally
    + */
    + if (!p->numa_migrate_seq)
    + p->numa_migrate_seq++;
    return;
    + }

    /* This task has no NUMA fault statistics yet */
    if (unlikely(p->numa_preferred_nid == -1))

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