Oops, forgot to CC linux-mm.

Nick Piggin wrote:
> This patch is only intended for comments.
> 
> This implements (crappy?) infrastructure for per-zone slab LRUs for
> reclaimable slabs, and moves dcache.c over to use that.
> 
> The global unused list is retained to reduce intrusiveness, and another
> per-zone LRU list is added (which are still protected with the global 
> dcache
> lock). This is an attempt to make slab scanning more robust on highmem and
> NUMA systems.
> 
> One concern is that off-zone dentries might be pinning inodes in the zone
> we're trying to free memory for. I wonder if this can be solved?
>