linux-kernel - Re: [PATCH 0/6] mempolicy memory corruption fixlet

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Date:	Fri, 1 Jun 2012 08:51:21 -0500 (CDT)
From:	Christoph Lameter <cl@...ux.com>
To:	david@...g.hm
cc:	KOSAKI Motohiro <kosaki.motohiro@...il.com>,
	Andi Kleen <andi@...stfloor.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org,
	Andrew Morton <akpm@...gle.com>, Dave Jones <davej@...hat.com>,
	Mel Gorman <mgorman@...e.de>, stable@...r.kernel.org,
	hughd@...gle.com, sivanich@....com
Subject: Re: [PATCH 0/6] mempolicy memory corruption fixlet

On Thu, 31 May 2012, david@...g.hm wrote:

> On Wed, 30 May 2012, KOSAKI Motohiro wrote:
>
> > On Wed, May 30, 2012 at 4:10 PM, Andi Kleen <andi@...stfloor.org> wrote:
> > > > Yes, that's right direction, I think. Currently, shmem_set_policy()
> > > > can't handle
> > > > nonlinear mapping.
> > >
> > > I've been mulling for some time to just remove non linear mappings.
> > > AFAIK they were only useful on 32bit and are obsolete and could be
> > > emulated with VMAs instead.
> >
> > I agree. It is only userful on 32bit and current enterprise users don't use
> > 32bit anymore. So, I don't think emulated by vmas cause user visible issue.
>
> I wish this was true, there are a lot of systems out there still running 32
> bit linux, even on 64 bit capible hardware. This is especially true in
> enterprises where they have either homegrown or proprietary software that
> isn't 64 bit clean.

32 bit binaries (and entire distros) run fine under 64 bit kernels.

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