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

[Christoph Lameter]

On Mon, 3 Mar 2008, Nick Piggin wrote:

> > If they are already not cache line aligned then we can make them as 
> > dense as possible. That is what SLUB does.
> 
> Because when you specify HWCACHE_ALIGN, it means that you want the object
> not to cross cacheline boundaries for at least cache_line_size() bytes.
> SLAB does this. SLUB does not without this patch.

HWCACHE_ALIGN means that you want the object to be aligned at 
cacheline boundaries for optimization. Why does crossing cacheline 
boundaries matter in this case?

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