From: Andi Kleen <ak@suse.de>
To: Christoph Lameter <christoph@lameter.com>
Cc: Andi Kleen <ak@suse.de>, Dave Hansen <haveblue@us.ibm.com>,
linux-mm@kvack.org
Subject: Re: [patch] CONFIG_ARCH_HAS_ATOMIC_UNSIGNED
Date: Fri, 17 Dec 2004 20:37:24 +0100 [thread overview]
Message-ID: <20041217193724.GA13542@wotan.suse.de> (raw)
In-Reply-To: <Pine.LNX.4.58.0412171118430.20902@server.graphe.net>
On Fri, Dec 17, 2004 at 11:26:49AM -0800, Christoph Lameter wrote:
> On Fri, 17 Dec 2004, Andi Kleen wrote:
>
> > > Put the order of the page there for compound pages instead of having that
> > > in index?
> >
> > That would waste memory on the 64bit architectures that cannot tolerate
> > 32bit atomic flags or on true 32bit architecture.
>
> Would be great to have 64 bit atomic support to fill this hole then.
I think you lost me. How would that help?
To fill the hole you would need a 4 byte member with padding to move around,
but there isn't one. You cannot also just add one because it would waste
memory on 32bit archs and other 64bit archs.
-Andi
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next prev parent reply other threads:[~2004-12-17 19:37 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2004-12-17 0:44 Dave Hansen
2004-12-17 6:11 ` Andi Kleen
2004-12-17 8:42 ` Dave Hansen
2004-12-17 16:27 ` Christoph Lameter
2004-12-17 16:33 ` Andi Kleen
2004-12-17 19:26 ` Christoph Lameter
2004-12-17 19:37 ` Andi Kleen [this message]
2004-12-17 22:11 ` Christoph Lameter
2004-12-18 6:50 ` Andi Kleen
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