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    SubjectRe: [PATCH UPDATED2 11/11] blkcg: unify blkg's for blkcg policies
    On Mon, Feb 13, 2012 at 05:33:47PM -0800, Tejun Heo wrote:

    [..]
    > Modified to update root blkgs on elvswitch too.
    >
    > Jens, there are a couple other changes but they're all trivial. I
    > didn't want to repost both patchsets for those changes. The git
    > branch has been updated. Ping me if you want the full series
    > reposted.
    >
    > git://git.kernel.org/pub/scm/linux/kernel/git/tj/misc.git blkcg-unified-blkg
    >
    > I'd really like to get this into block/core and get some exposure in
    > linux-next. There still are a lot of transitional stuff but I feel
    > that there's now somewhat solid ground to build stuff atop. Vivek,
    > what do you think?

    Hi Tejun,

    As this patch series is getting longer (already 2 sets are out there), I
    think it is reasonable to get some testing going in linux-next. I can think
    of atleast few more things which you might be planning to push before
    3.4 merge window opens.

    - Cleanup in-place policy data update logic.

    - Do not kill all the groups upon one policy switch. Keep the group around
    and just kill the policy data of associated policy.

    - Get rid if locking complexity and rcu around group removal. Replace with
    double lock dancing stuff.

    - Fix the per cpu alloc stat alloc mess. This is anyway needed
    irrespective of cleanup.

    Thanks
    Vivek


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