Re: [PATCH] mm: count only reclaimable lru pages v2

[Johannes Weiner <hannes@cmpxchg.org>]

On Thu, Jul 16, 2009 at 11:09:01PM +0800, Wu Fengguang wrote:

> mm: count only reclaimable lru pages 
> 
> 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 also won't be scanned. So the anon pages shall not be counted in both
> usage scenarios. Also rename to _reclaimable_pages: now they are counting
> the possibly reclaimable lru pages.
> 
> 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 reduce false OOM kills.
> 
> Acked-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
> Reviewed-by: Rik van Riel <riel@redhat.com>
> Reviewed-by: Christoph Lameter <cl@linux-foundation.org>
> Reviewed-by: Minchan Kim <minchan.kim@gmail.com>
> Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
> Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

Acked-by: Johannes Weiner <hannes@cmpxchg.org>