linux-kernel - Re: [rfc][patch 1/3] slub: fix small HWCACHE

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Message-ID: <Pine.LNX.4.64.0803061816430.28976@schroedinger.engr.sgi.com>
Date:	Thu, 6 Mar 2008 18:20:40 -0800 (PST)
From:	Christoph Lameter <clameter@....com>
To:	Nick Piggin <npiggin@...e.de>
cc:	Pekka Enberg <penberg@...helsinki.fi>, netdev@...r.kernel.org,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	yanmin_zhang@...ux.intel.com, David Miller <davem@...emloft.net>,
	Eric Dumazet <dada1@...mosbay.com>
Subject: Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment

On Fri, 7 Mar 2008, Nick Piggin wrote:

> > Do you have a case in mind where that would be useful? We had a 
> 
> Patch 3/3

Those already have SLAB_HWCACHE_ALIGN.

The point is to switch off alignment for UP? Cant we do that with 
SLAB_HWCACHE_ALIGN too since SLOB seemed to work successfully without it 
in the past?

> > Note that there is also KMEM_CACHE which picks up the alignment from 
> > the compiler.
> 
> Yeah, that's not quite as good either. My allocation flag is dynamic, so
> it will not bloat things for no reason on UP machines and SMP kernels. 
> It also aligns to the detected machine cacheline size rather than a
> compile time constant.

Is that really a noteworthy effect?
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