linux-kernel - Re: [RFC 5/7] Laundry handling for direct reclaim

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Date:	Tue, 21 Aug 2007 14:00:28 -0700 (PDT)
From:	Christoph Lameter <clameter@....com>
To:	Mel Gorman <mel@...net.ie>
cc:	linux-mm@...ck.org, linux-kernel@...r.kernel.org,
	akpm@...ux-foundation.org, dkegel@...gle.com,
	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	David Miller <davem@...emloft.net>,
	Nick Piggin <npiggin@...e.de>
Subject: Re: [RFC 5/7] Laundry handling for direct reclaim

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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