Re: [PATCH 06/13] writeback: bdi write bandwidth estimation

[Wu Fengguang]

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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