Re: [RFC] non-refcounted pages, application to slab?

[Pekka Enberg]

Hi Nick,

On 1/25/06, Nick Piggin <npiggin@xxxxxxx> wrote:
> This is probably not worthwhile for most cases, but slab did strike me
> as a potential candidate (however the complication here is that some
> code I think uses the refcount of underlying pages of slab allocations
> eg nommu code). So it is not a complete patch, but I wonder if anyone
> thinks the savings might be worth the complexity?
>
> Is there any particular code that is really heavy on slab allocations?
> That isn't mostly handled by the slab's internal freelists?

I certainly hope not. For heavy users, the slab allocator should grow
caches enough to satisfy most allocations from the them. Also, I think
we want to keep the reference counting for slab pages so that we can
use kmalloc'd memory in the block layer.

                                Pekka
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