Re: [RFC] Simple Slab: A slab allocator with minimal metainformation

From: KAMEZAWA Hiroyuki
Date: Thu Aug 10 2006 - 01:02:04 EST


On Wed, 9 Aug 2006 17:52:00 -0700 (PDT)
Christoph Lameter <clameter@xxxxxxx> wrote:

> struct page overloading:
> - _mapcout => Used to count the objects in use in a slab
> - mapping => Reference to the slab structure
> - index => Pointer to the first free element in a slab
> - lru => Used for list management.
it seems it's time that the page struct should have more unions ;)

> There is no freelist for slabs. slabs are immediately returned to the page
> allocator. The page allocator has its own per cpu page queues that should provide
> enough caching.

I think that the advantage of Slab allocator is
- object is already initizalized at setup, so you don't have to initialize it again at
- object is initialized only once when slab is created.

If a slab page is returned to page allocator ASAP, # of object initilization may


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