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    Subject[PATCH 3/7] RT: Only consider online CPUs when pushing rt tasks
    Date
    task->cpus_allowed can have bit positions that are set for CPUs that are
    not currently online. So we optimze our search by ANDing against the online
    set.

    Signed-off-by: Gregory Haskins <ghaskins@novell.com>
    ---

    kernel/sched.c | 6 +++++-
    1 files changed, 5 insertions(+), 1 deletions(-)

    diff --git a/kernel/sched.c b/kernel/sched.c
    index 24b38b4..0ca3905 100644
    --- a/kernel/sched.c
    +++ b/kernel/sched.c
    @@ -1510,10 +1510,14 @@ static int push_rt_task(struct rq *this_rq)

    /* Only try this algorithm three times */
    for (tries = 0; tries < 3; tries++) {
    + cpumask_t mask;
    +
    + cpus_and(mask, cpu_online_map, next_task->cpus_allowed);
    +
    /*
    * Scan each rq for the lowest prio.
    */
    - for_each_cpu_mask(cpu, next_task->cpus_allowed) {
    + for_each_cpu_mask(cpu, mask) {
    struct rq *rq = &per_cpu(runqueues, cpu);

    if (cpu == smp_processor_id())
    -
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