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

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To: Pekka Enberg <penberg@...>

Cc: Nick Piggin <npiggin@...>, <netdev@...>, Linux Kernel Mailing List <linux-kernel@...>, <yanmin_zhang@...>, David Miller <davem@...>, Eric Dumazet <dada1@...>

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

Date: Monday, March 3, 2008 - 5:32 pm

On Mon, 3 Mar 2008, Pekka Enberg wrote:

quoted text> Well, not my definition either but SLAB has guaranteed that for small
> objects in the past, so I think Nick has a point here. However, with
> all this back and forth, I've lost track why this matters. I suppose
> it causes regression on some workload?

Well the guarantee can only be exploited if you would check the cacheline 
sizes and the object size from the code that creates the slab cache. 
Basically you would have to guestimate what the slab allocator is doing.

So the guarantee is basically meaningless. If the object is larger than a 
cacheline then this will never work.

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Messages in current thread:

[rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Mon Mar 3, 5:34 am)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Mon Mar 3, 3:08 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Mon Mar 3, 4:06 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Mon Mar 3, 4:10 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Mon Mar 3, 4:17 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Mon Mar 3, 5:16 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Tue Mar 4, 8:06 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, David Miller, (Tue Mar 4, 8:10 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Wed Mar 5, 5:06 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Wed Mar 5, 10:57 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 6:56 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Thu Mar 6, 10:23 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 10:26 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Thu Mar 6, 10:32 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 10:54 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Thu Mar 6, 11:10 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 11:18 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Thu Mar 6, 11:22 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 11:58 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Fri Mar 7, 12:05 am)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Pekka Enberg, (Mon Mar 3, 5:30 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Mon Mar 3, 5:32 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Tue Mar 4, 8:08 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Pekka Enberg, (Mon Mar 3, 5:35 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Tue Mar 4, 8:28 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Wed Mar 5, 4:56 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Wed Mar 5, 10:49 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 6:53 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Thu Mar 6, 10:04 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 10:20 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Thu Mar 6, 10:25 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 10:27 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Thu Mar 6, 10:33 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Christoph Lameter, (Thu Mar 6, 10:33 pm)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Fri Mar 7, 1:23 am)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Pekka Enberg, (Mon Mar 3, 5:44 am)

Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment, Nick Piggin, (Mon Mar 3, 8:28 am)

[rfc][patch 3/3] use SLAB_ALIGN_SMP, Nick Piggin, (Mon Mar 3, 5:36 am)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Eric Dumazet, (Mon Mar 3, 5:53 am)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Nick Piggin, (Mon Mar 3, 8:41 am)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Eric Dumazet, (Mon Mar 3, 9:00 am)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Nick Piggin, (Mon Mar 3, 9:46 am)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Pekka Enberg, (Mon Mar 3, 9:53 am)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Christoph Lameter, (Mon Mar 3, 3:09 pm)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Nick Piggin, (Mon Mar 3, 4:10 pm)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Christoph Lameter, (Mon Mar 3, 4:12 pm)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Nick Piggin, (Mon Mar 3, 4:18 pm)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Christoph Lameter, (Mon Mar 3, 5:14 pm)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Eric Dumazet, (Mon Mar 3, 10:15 am)

Re: [rfc][patch 3/3] use SLAB_ALIGN_SMP, Christoph Lameter, (Mon Mar 3, 3:10 pm)

[rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Mon Mar 3, 5:35 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Mon Mar 3, 3:06 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Mon Mar 3, 4:03 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Mon Mar 3, 4:09 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Mon Mar 3, 4:12 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Mon Mar 3, 4:17 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Mon Mar 3, 4:24 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Mon Mar 3, 5:31 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Fri Mar 7, 12:37 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Fri Mar 7, 1:11 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Fri Mar 7, 1:19 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Fri Mar 7, 1:26 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Tue Mar 11, 3:13 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Wed Mar 12, 2:21 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Fri Mar 7, 1:37 am)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Nick Piggin, (Tue Mar 4, 8:16 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Pekka Enberg, (Mon Mar 3, 4:41 pm)

Re: [rfc][patch 2/3] slab: introduce SMP alignment, Christoph Lameter, (Mon Mar 3, 5:23 pm)

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