Christoph Lameter wrote:
On Wed, 9 May 2007, Nick Piggin wrote:
For small systems, I would not be surprised if that was less space
efficient, even just looking at kmalloc caches in isolation. Or do you
have numbers to support your conclusion?
No I do not have any number beyond the efficiency calculations based on
whole slabs. We would have to do some experiments to figure out how much
space is actually wasted through partial slabs.
If you just do straight allocation on a UP system then there is at maximum
one partial slab per slabcache with SLUB.
The situation becomes different with allocation and frees. Then we may
have lots of partial slabs that we allocate from.
Yeah, but even then I think the SLUB approach is a very nice one for a
general purpose system. Don't get me wrong, SLOB definitely is not good
for that :)
But the SLOB approach
also will have holes to manage. So I do not see how this could be a
benefit unless you only have a few precious pages and you need to put
multiple object sizes into it. A 4M system still has 1000 pages.
Right, and it takes a long long time to do anything on my 4G system ;)
But that 4MB system might not even have 50 pages that you'd want to
use for slab.
--
SUSE Labs, Novell Inc.
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