RE: [PATCH] slub: Don't throw away partial remote slabs if there is no local memory

From: Anton Blanchard
We noticed a huge amount of slab memory consumed on a large ppc64 box:
=20
Slab:            2094336 kB
=20
Almost 2GB. This box is not balanced and some nodes do not have local
memory, causing slub to be very inefficient in its slab usage.
=20
Each time we call kmem_cache_alloc_node slub checks the per cpu slab,
sees it isn't node local, deactivates it and tries to allocate a new
slab. ...

...

 	if (unlikely(!node_match(page, node))) {
 		stat(s, ALLOC_NODE_MISMATCH);
		deactivate_slab(s, page, c->freelist);
		c->page =3D NULL;
		c->freelist =3D NULL;
		goto new_slab;
 	}

Why not just delete the entire test?
Presumably some time a little earlier no local memory was available.
Even if there is some available now, it is very likely that some won't
be available again in the near future.

	David.