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    Subject[PATCHSET] block: per-queue policy activation

    It seems that we're *finally* nearing the end of the long blkcg API
    cleanup. With all the previous updates, blkcg code is now clean &
    modular enough to implement per-queue policy activation.

    Upto now, blkcg assumed that all policies are active on all queues
    which simply isn't true - cfq policy is only applicable to queues
    which are using cfq as the elevator. Also, for transition purposes,
    the current implementation clears all !root blkgs blkgs across
    elevator switch and policy [de]registration in racy manner.

    This patchset implements per-queue policy activation. Static policy
    ID is replaced with dynamic registration and each policy should be
    activated and deactivated explicitly on each queue. On activation,
    the matching policy data are created on all existing blkgs. On
    deactivation, the matching policy data are removed from all existing
    blkgs. blkg printing skips blkg-policy combination which is disabled
    and trying to configure a policy on a blkg which doesn't have the
    policy enabled would return -EINVAL instead of creating an unused
    dummy configuration.


    0001-0003 removes static policy IDs.

    0004-0006 are prep patches.

    0007 implements per-queue policy activation.

    0008 drops unnecessary stuff.

    This patchset is on top of the current block/for-3.5/core 5bc4afb1ec
    "blkcg: drop BLKCG_STAT_{PRIV|POL|OFF} macros" and also available in
    the following git branch.

    git:// blkcg-pols

    diffstat follows.

    block/blk-cgroup.c | 424 ++++++++++++++++++++++++++++++-------------------
    block/blk-cgroup.h | 43 ++--
    block/blk-core.c | 4
    block/blk-throttle.c | 78 +++------
    block/cfq-iosched.c | 71 ++++----
    block/elevator.c | 2
    include/linux/blkdev.h | 10 +
    7 files changed, 367 insertions(+), 265 deletions(-)



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