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    SubjectRe: [PATCHSET] block: per-queue policy activation, take#2
    On Fri, Apr 13 2012, Tejun Heo wrote:
    > Hello,
    > 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.
    > Changes from the last take[L] are
    > * 0001 to fix config dependent build error / warnings added.
    > * More comments added to 0006 as suggested by Vivek.
    > * 0007 added to avoid boot time bypass delays.
    > * 0009 made cfq_init_queue() return garbage after alloc failure if
    > * 0011 which shoots down all blkgs if no policy is activated added.
    > Suggested by Vivek.
    > 0001-cfq-fix-build-breakage-warnings.patch
    > 0002-blkcg-kill-blkio_list-and-replace-blkio_list_lock-wi.patch
    > 0003-blkcg-use-pol-instead-of-plid-in-update_root_blkg_pd.patch
    > 0004-blkcg-remove-static-policy-ID-enums.patch
    > 0005-blkcg-make-blkg_conf_prep-take-pol-and-return-with-q.patch
    > 0006-blkcg-make-sure-blkg_lookup-returns-NULL-if-q-is-byp.patch
    > 0007-blkcg-make-request_queue-bypassing-on-allocation.patch
    > 0008-blkcg-add-request_queue-root_blkg.patch
    > 0009-blkcg-implement-per-queue-policy-activation.patch
    > 0010-blkcg-drop-stuff-unused-after-per-queue-policy-activ.patch
    > 0011-blkcg-shoot-down-blkgs-if-all-policies-are-deactivat.patch
    > 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.

    Applied. Even if we need a bit more churn on this one, we should get
    things in gear and for-next updated at least.

    Jens Axboe

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