Re: [PATCH] mm: count only reclaimable lru pages

[Peter Zijlstra]

On Thu, 2009-07-16 at 21:34 +0800, Wu Fengguang wrote:
> global_lru_pages() / zone_lru_pages() can be used in two ways:
> - to estimate max reclaimable pages in determine_dirtyable_memory()  
> - to calculate the slab scan ratio
> 
> When swap is full or not present, the anon lru lists are not reclaimable
> and thus won't be scanned. So the anon pages shall not be counted. Also
> rename the function names to reflect the new meaning.
> 
> It can greatly (and correctly) increase the slab scan rate under high memory
> pressure (when most file pages have been reclaimed and swap is full/absent),
> thus avoid possible false OOM kills.
> 
> Cc: Minchan Kim <minchan.kim@xxxxxxxxx>
> Cc: KOSAKI Motohiro <kosaki.motohiro@xxxxxxxxxxxxxx>
> Signed-off-by: Wu Fengguang <fengguang.wu@xxxxxxxxx>

Makes sense.

Acked-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>


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