Pekka J Enberg wrote:
I think you mean
static inline struct kmem_cache *slab_get_cache(const void *obj)
{
struct kmem_cache **p = (void *)((unsigned long) obj & ~(PAGE_SIZE-1));
return *p;
}
Of course.
On Tue, 9 May 2006, Manfred Spraul wrote:
The result would be a few small restrictions: all objects must start in the
first page of a slab (there are no exceptions on my 2.6.16 system), and
PAGE_SIZE'd caches are very expensive. Replacing the names_cache with
get_free_page is trivial. That leaves the pgd cache.
Your plan makes sense for slabs that have slab management structures
embedded within.
No - it would only make sense if it could be used for all slabs.
Otherwise: How should kfree figure out if it's called for a slab with
embedded pointers or not?
We already have enough free space there for one pointer
due to
colour_off += cachep->slab_size;
in the alloc_slabmgmt() function, I think. Are you planning to kill
external slab management allocation completely by switching to
get_free_pages() for those cases? I'd much rather make the switch to page
allocator under the hood so kmalloc(PAGE_SIZE*n) would still work because
it's much nicer API.
How many kmalloc(PAGE_SIZE*n) users are there?
--
Manfred
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