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    Subject[PATCH 13/15] cfq-iosched: never allow an async queue idling
    Date
    We don't enable it by default, don't let it get enabled during
    runtime.

    Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
    ---
    block/cfq-iosched.c | 7 ++++++-
    1 files changed, 6 insertions(+), 1 deletions(-)
    diff --git a/block/cfq-iosched.c b/block/cfq-iosched.c
    index 8f76aed..f920527 100644
    --- a/block/cfq-iosched.c
    +++ b/block/cfq-iosched.c
    @@ -1597,7 +1597,12 @@ static void
    cfq_update_idle_window(struct cfq_data *cfqd, struct cfq_queue *cfqq,
    struct cfq_io_context *cic)
    {
    - int enable_idle = cfq_cfqq_idle_window(cfqq);
    + int enable_idle;
    +
    + if (!cfq_cfqq_sync(cfqq))
    + return;
    +
    + enable_idle = cfq_cfqq_idle_window(cfqq);

    if (!cic->ioc->task || !cfqd->cfq_slice_idle ||
    (cfqd->hw_tag && CIC_SEEKY(cic)))
    --
    1.5.1.1.190.g74474
    -
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