AFAICS slab.c has 2 weaks spots:
* cache hit rates are ignored on UP, and for objects > PAGE_SIZE on both
SMP and UP.
* freeable pages are not returned efficiently to page_alloc.c, neither
on SMP nor on UP. On SMP, this is a big problems, because the
cache_chain_semaphore is overloaded.
I just wanted to say that a hotlist in page_alloc.c is not able to
replace a hotlist in slab.c, because many objects are smaller than page
size. Both lists are needed.
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