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    SubjectRe: [PATCHSET] blkcg: unify blkgs for different policies

    On Thu, Feb 02, 2012 at 02:29:58PM -0500, Vivek Goyal wrote:
    > On Wed, Feb 01, 2012 at 01:19:05PM -0800, Tejun Heo wrote:
    > [..]
    > >
    > > * use unified stats updated under queue lock and drop percpu stats
    > > which should fix locking / context bug across percpu allocation.
    > Does that mean that stat updation will happen under queue lock even if
    > there are no throttling rules? That will introduce extra queue lock on
    > fast path those who have throttling compiled in but are not using (common
    > case for distributions).

    No, I don't think extra locking would be necessary at all. We end up
    grabbing queue_lock anyway. It's just the matter of where to update
    the stats.



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