linux-kernel - Re: [RFC][PATCH 2/9] mm: slub: abstract out double cmpxchg option

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Message-ID: <alpine.DEB.2.02.1401141832420.32645@chino.kir.corp.google.com>
Date:	Tue, 14 Jan 2014 18:37:45 -0800 (PST)
From:	David Rientjes <rientjes@...gle.com>
To:	Dave Hansen <dave@...1.net>
cc:	Christoph Lameter <cl@...ux.com>, linux-mm@...ck.org,
	linux-kernel@...r.kernel.org, akpm@...ux-foundation.org,
	penberg@...nel.org
Subject: Re: [RFC][PATCH 2/9] mm: slub: abstract out double cmpxchg option

On Tue, 14 Jan 2014, Dave Hansen wrote:

> > On Tue, 14 Jan 2014, Dave Hansen wrote:
> >> I found this useful to have in my testing.  I would like to have
> >> it available for a bit, at least until other folks have had a
> >> chance to do some testing with it.
> > 
> > I dont really see the point of this patch since we already have
> > CONFIG_HAVE_ALIGNED_STRUCT_PAGE to play with.
> 
> With the current code, if you wanted to turn off the double-cmpxchg abd
> get a 56-byte 'struct page' how would you do it?  Can you do it with a
> .config, or do you need to hack the code?
> 

If that's the intention of disabling this new config option, then it 
should probably mention the savings in the "help" section, similar to what
CONFIG_HAVE_ALIGNED_STRUCT_PAGE says.
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