Re: [PATCH] fs: fcntl_setlease defies lease_init assumptions

[Pekka Enberg <penberg@cs.helsinki.fi>]

On Tue, 2006-05-09 at 20:25 +0200, Manfred Spraul wrote:
> No - it would only make sense if it could be used for all slabs. 
> Otherwise: How should kfree figure out if it's called for a slab with 
> embedded pointers or not?

Yeah, you're absolutely right. Which is exactly why I asked what you
want to do with the OFF_SLAB case. We certainly can support both by
virtualizing kfree() and kmem_cache_free() with struct slab_operations
type of thing, but that's probably not very performant. Well, it might
be for NUMA, as virt_to_page() is so expensive.

Anyway, embedding struct kmem_cache pointer in the beginning of slab
page is doable (I have a proof-of-concept patch for that btw) but we
need to solve OFF_SLAB first.

				Pekka

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