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    Subject[PATCH 11/19] io-controller: noop changes for hierarchical fair queuing
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    This patch changes noop to use queue scheduling code from elevator layer.
    One can go back to old noop by deselecting CONFIG_IOSCHED_NOOP_HIER.

    Signed-off-by: Nauman Rafique <nauman@google.com>
    Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
    ---
    block/Kconfig.iosched | 11 +++++++++++
    block/noop-iosched.c | 3 +++
    2 files changed, 14 insertions(+), 0 deletions(-)

    diff --git a/block/Kconfig.iosched b/block/Kconfig.iosched
    index a91a807..9da6657 100644
    --- a/block/Kconfig.iosched
    +++ b/block/Kconfig.iosched
    @@ -25,6 +25,17 @@ config IOSCHED_NOOP
    that do their own scheduling and require only minimal assistance from
    the kernel.

    +config IOSCHED_NOOP_HIER
    + bool "Noop Hierarchical Scheduling support"
    + depends on IOSCHED_NOOP && CGROUPS
    + select ELV_FAIR_QUEUING
    + select GROUP_IOSCHED
    + default n
    + ---help---
    + Enable hierarhical scheduling in noop. In this mode noop keeps
    + one IO queue per cgroup instead of a global queue. Elevator
    + fair queuing logic ensures fairness among various queues.
    +
    config IOSCHED_AS
    tristate "Anticipatory I/O scheduler"
    default y
    diff --git a/block/noop-iosched.c b/block/noop-iosched.c
    index 731dbf2..926aed9 100644
    --- a/block/noop-iosched.c
    +++ b/block/noop-iosched.c
    @@ -92,6 +92,9 @@ static struct elevator_type elevator_noop = {
    .elevator_alloc_sched_queue_fn = noop_alloc_noop_queue,
    .elevator_free_sched_queue_fn = noop_free_noop_queue,
    },
    +#ifdef CONFIG_IOSCHED_NOOP_HIER
    + .elevator_features = ELV_IOSCHED_NEED_FQ | ELV_IOSCHED_SINGLE_IOQ,
    +#endif
    .elevator_name = "noop",
    .elevator_owner = THIS_MODULE,
    };
    --
    1.6.0.6


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