On Tue, 21 Aug 2007, Mel Gorman wrote:
> > + nr_reclaimed += shrink_zones(priority, zones, &sc, &laundry);
> > shrink_slab(sc.nr_scanned, gfp_mask, lru_pages);
> > if (reclaim_state) {
> > nr_reclaimed += reclaim_state->reclaimed_slab;
> > reclaim_state->reclaimed_slab = 0;
> > }
> > +
> > total_scanned += sc.nr_scanned;
> > +
>
> Could this not isolate a load of dirty pages on the laundry list and then
> shortly later go to sleep in congestion_wait() ? It would appear that with
> writeout deferred that the going to sleep is going to do nothing to help
> the situation.
Yep that seems to be the problem that Peter saw. We need to throttle
later.
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