Re: [rfc][patch 2/3] slab: introduce SMP alignment

Nick Piggin
2008-03-11T07:13:46Z

On Thu, Mar 06, 2008 at 09:26:24PM -0800, Christoph Lameter wrote:
> Internode alignment is 4k. If you need an object aligned like that then it
> may be better to go to the page allocator.

I never got a reply about this. Again: how can the modern slab allocator
avoid the need for internode alignment in order to prevent cacheline
pingpong on vsmp? Because I'm going to resubmit the SMP_ALIGN patch.

Also, the last I heard about the HWCACHE_ALIGN from you is that it didn't
make sense... I see it's merged now, which I appreciate, but I think it is
really important that we're on the same page here, so let me know if it
still doesn't make sense.

Thanks,
Nick