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

[KAMEZAWA Hiroyuki]

Hi,

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
  allocation.
- object is initialized only once when slab is created.

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

-Kame

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