>
>Can we get you to agree that basically all subpage objects are immovable?
>
No. Certainly not in the general case, and I think Josh found ways to
handle the dcache case. If we can simply free the old objects, we don't
actually have to move the hot ones, as he points out.
>
>And as a consequence that garbage collecting at subpage levels doesn't
>guarantee freeing up any pages that can then be given up to other
>subsystems in response to VM pressure? The GC must think in terms of pages
>to actually make progress.
>
>One of the design goals of slab by the way is that objects of a similar
>type will end up having similar lifetimes, avoiding some of the worst
>cases of sub-page allocations.
>
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