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    SubjectRe: [PATCH 08/40] mm: kmem_cache_objsize
    Christoph Lameter wrote:
    > SLAB can calculate exactly how many pages are needed. The per
    > cpu and per node stuff is setup at boot and does not change. We are
    > talking about the worst case scenario here. True in case of an off slab
    > we have additional overhead that would also have to go into worst case
    > scenario.

    Fair enough. But there's no way it can take into account any slab
    management structures it needs to allocate. The slab simply doesn't know
    how many pages are needed to _allocate n amount of objects_.

    Peter is interested in a _rough estimate_ so I don't see the point of
    adding that kind of logic in the slab. It's an API that simply cannot
    satisfy all its callers which is why I suggested exposing buffer size in
    the first place (the slab certainly knows how many bytes it needs for
    one object).

    Pekka
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