Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment

[Christoph Lameter]

On Thu, 6 Mar 2008, Nick Piggin wrote:

> > That was due to SLUB's support for smaller allocation sizes. AFAICT has 
> > nothing to do with alignment.
> 
> The smaller sizes meant objects were less often aligned on cacheline
> boundaries.

Right since SLAB_HWCACHE_ALIGN does not align for very small objects.

> We could, but I'd rather just use the flag.

Do you have a case in mind where that would be useful? We had a 
SLAB_HWCACHE_MUST_ALIGN or so at some point but it was rarely to never 
used. Note that there is also KMEM_CACHE which picks up the alignment from 
the compiler.


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