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

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Message-Id: <20080304.161003.129716254.davem@davemloft.net>
Date:	Tue, 04 Mar 2008 16:10:03 -0800 (PST)
From:	David Miller <davem@...emloft.net>
To:	npiggin@...e.de
Cc:	clameter@....com, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, yanmin_zhang@...ux.intel.com,
	dada1@...mosbay.com
Subject: Re: [rfc][patch 1/3] slub: fix small HWCACHE_ALIGN alignment

From: Nick Piggin <npiggin@...e.de>
Date: Wed, 5 Mar 2008 01:06:37 +0100

> On Mon, Mar 03, 2008 at 01:16:44PM -0800, Christoph Lameter wrote:
> > On Mon, 3 Mar 2008, Nick Piggin wrote:
> > 
> > > > 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?
> > > 
> > > No, HWCACHE_ALIGN means that you want the object not to cross cacheline
> > > boundaries for at least cache_line_size() bytes. You invented new
> > 
> > Interesting new definition....
> 
> Huh?? It is not a new definition, it is exactly what SLAB does. And
> then you go and do something different and claim that you follow
> what slab does.

I completely agree with Nick.
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