Re: [PATCH 08/40] mm: kmem_cache_objsize

From: Christoph Lameter
Date: Fri May 04 2007 - 12:36:52 EST


On Fri, 4 May 2007, Peter Zijlstra wrote:

> Expost buffer_size in order to allow fair estimates on the actual space
> used/needed.

If its just an estimate that you are after then I think ksize is
sufficient.

The buffer size does not include the other per slab overhead that SLAB
needs nor the alignment overhead or the padding. For SLUB you'd be more
lucky but there it does not include the per slab padding that exist.

Need to check how this is going to be used. It is difficult to estimate
slab use because this depends on the availability of object slots in
partial slabs.

I could add a function that tells you how many object you could allocate
from a slab without the page allocator becoming involved? It would count
the object slots available on the partial slabs.
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