On Thu, 2007-04-05 at 16:24 -0700, Andrew Morton wrote:
> On Thu, 05 Apr 2007 19:42:21 +0200
> [email protected] wrote:
>
> > Now that we have per BDI dirty throttling is makes sense to also have oer BDI
> > congestion feedback; why wait on another device if the current one is not
> > congested.
>
> Similar comments apply. congestion_wait() should be called
> throttle_at_a_rate_proportional_to_the_speed_of_presently_uncongested_queues().
>
> If a process is throttled in the page allocator waiting for pages to become
> reclaimable, that process absolutely does not care whether those pages were
> previously dirty against /dev/sda or against /dev/sdb. It wants to be woken
> up for writeout completion against any queue.
OK, so you disagree with Miklos' 2nd point here:
http://lkml.org/lkml/2007/4/4/137
And in the light of clear_bdi_congestion() being called for each
writeout completion under the threshold this does make sense.
So this whole 8-12/12 series is not needed and just served as an
learning experience :-/
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