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