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    SubjectRe: [PATCH 06/13] writeback: bdi write bandwidth estimation
    On Wed, Nov 24, 2010 at 09:42:09PM +0800, Peter Zijlstra wrote:
    > On Wed, 2010-11-24 at 21:20 +0800, Wu Fengguang wrote:
    > > > (jiffies - bdi->write_bandwidth_update_time < elapsed)
    > >
    > > this will be true if someone else has _done_ overlapped estimation,
    > > otherwise it will equal:
    > >
    > > jiffies - bdi->write_bandwidth_update_time == elapsed
    > >
    > > Sorry the comment needs updating.
    >
    > Right, but its racy as hell..

    Yeah, for N concurrent dirtiers, plus the background flusher, only
    one is able to update write_bandwidth[_update_time]..



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