Re: [PATCH v2 1/2] mm: Export nr_swap_pages

Johannes Weiner
2015-12-04T16:10:01Z

On Fri, Dec 04, 2015 at 03:58:53PM +0000, Chris Wilson wrote:
> Some modules, like i915.ko, use swappable objects and may try to swap
> them out under memory pressure (via the shrinker). Before doing so, they
> want to check using get_nr_swap_pages() to see if any swap space is
> available as otherwise they will waste time purging the object from the
> device without recovering any memory for the system. This requires the
> nr_swap_pages counter to be exported to the modules.
>
> Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
> Cc: "Goel, Akash" <akash.goel@intel.com>
> Cc: Johannes Weiner <hannes@cmpxchg.org>
> Cc: linux-mm@kvack.org

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