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    Subject[PATCH 01/31] sched, numa, mm: Make find_busiest_queue() a method
    Its a bit awkward but it was the least painful means of modifying the
    queue selection. Used in a later patch to conditionally use a random
    queue.

    Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
    Cc: Paul Turner <pjt@google.com>
    Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
    Cc: Christoph Lameter <cl@linux.com>
    Cc: Rik van Riel <riel@redhat.com>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Ingo Molnar <mingo@kernel.org>
    ---
    kernel/sched/fair.c | 20 ++++++++++++--------
    1 file changed, 12 insertions(+), 8 deletions(-)

    Index: tip/kernel/sched/fair.c
    ===================================================================
    --- tip.orig/kernel/sched/fair.c
    +++ tip/kernel/sched/fair.c
    @@ -3063,6 +3063,9 @@ struct lb_env {
    unsigned int loop;
    unsigned int loop_break;
    unsigned int loop_max;
    +
    + struct rq * (*find_busiest_queue)(struct lb_env *,
    + struct sched_group *);
    };

    /*
    @@ -4236,13 +4239,14 @@ static int load_balance(int this_cpu, st
    struct cpumask *cpus = __get_cpu_var(load_balance_tmpmask);

    struct lb_env env = {
    - .sd = sd,
    - .dst_cpu = this_cpu,
    - .dst_rq = this_rq,
    - .dst_grpmask = sched_group_cpus(sd->groups),
    - .idle = idle,
    - .loop_break = sched_nr_migrate_break,
    - .cpus = cpus,
    + .sd = sd,
    + .dst_cpu = this_cpu,
    + .dst_rq = this_rq,
    + .dst_grpmask = sched_group_cpus(sd->groups),
    + .idle = idle,
    + .loop_break = sched_nr_migrate_break,
    + .cpus = cpus,
    + .find_busiest_queue = find_busiest_queue,
    };

    cpumask_copy(cpus, cpu_active_mask);
    @@ -4261,7 +4265,7 @@ redo:
    goto out_balanced;
    }

    - busiest = find_busiest_queue(&env, group);
    + busiest = env.find_busiest_queue(&env, group);
    if (!busiest) {
    schedstat_inc(sd, lb_nobusyq[idle]);
    goto out_balanced;



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