Re: [PATCH][5/?] count writeback pages in nr_scanned

[Andrew Morton]

Nick Piggin <nickpiggin@xxxxxxxxxxxx> wrote:
>
> Rik van Riel wrote:
> > On Thu, 6 Jan 2005, Nick Piggin wrote:
> > 
> >> I think what Andrea is worried about is that blk_congestion_wait is 
> >> fairly vague, and can be a source of instability in the scanning 
> >> implementation.
> > 
> > 
> > The recent OOM kill problem has been happening:
> > 1) with cache pressure on lowmem only, due to a block device write
> > 2) with no block congestion at all
> > 3) with pretty much all pageable lowmme pages in writeback state
> > 
> > It appears the VM has trouble dealing with the situation where
> > there is no block congestion to wait on...
> > 
> 
> Try, together with your nr_scanned patch, to replace blk_congestion_wait
> with io_schedule_timeout.

Why?  Is the nr_scanned fix insufficient?
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