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    Subject[PATCH] io-controller: Don't expire an idle ioq if it's the only ioq in hierarchy
    Hi Vivek,

    We don't expect expiring an idle ioq if it's the only ioq
    in the hierarchy.

    Signed-off-by: Gui Jianfeng <guijianfeng@cn.fujitsu.com>
    ---
    block/elevator-fq.c | 12 ++++++------
    1 files changed, 6 insertions(+), 6 deletions(-)

    diff --git a/block/elevator-fq.c b/block/elevator-fq.c
    index 4270cfd..0b65e16 100644
    --- a/block/elevator-fq.c
    +++ b/block/elevator-fq.c
    @@ -4058,12 +4058,6 @@ void elv_ioq_completed_request(struct request_queue *q, struct request *rq)
    elv_clear_ioq_slice_new(ioq);
    }

    - if (elv_ioq_class_idle(ioq)) {
    - if (elv_iosched_expire_ioq(q, 1, 0))
    - elv_ioq_slice_expired(q);
    - goto done;
    - }
    -
    /*
    * If there is only root group present, don't expire the queue
    * for single queue ioschedulers (noop, deadline, AS). It is
    @@ -4077,6 +4071,12 @@ void elv_ioq_completed_request(struct request_queue *q, struct request *rq)
    goto done;
    }

    + if (elv_ioq_class_idle(ioq)) {
    + if (elv_iosched_expire_ioq(q, 1, 0))
    + elv_ioq_slice_expired(q);
    + goto done;
    + }
    +
    /* For async queue try to do wait busy */
    if (efqd->fairness && !elv_ioq_sync(ioq) && !ioq->nr_queued
    && (elv_iog_nr_active(iog) <= 1)) {
    --
    1.5.4.rc3



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