Date: Fri, 1 Jun 2012 08:51:21 -0500 (CDT)
From: Christoph Lameter <cl@linux.com>
To: david@lang.hm
cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com>,
        Andi Kleen <andi@firstfloor.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        linux-kernel@vger.kernel.org, linux-mm@kvack.org,
        Andrew Morton <akpm@google.com>, Dave Jones <davej@redhat.com>,
        Mel Gorman <mgorman@suse.de>, stable@vger.kernel.org, hughd@google.com,
        sivanich@sgi.com
Subject: Re: [PATCH 0/6] mempolicy memory corruption fixlet
In-Reply-To: <alpine.DEB.2.02.1205311744280.17976@asgard.lang.hm>
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References: <1338368529-21784-1-git-send-email-kosaki.motohiro@gmail.com> <CA+55aFzoVQ29C-AZYx=G62LErK+7HuTCpZhvovoyS0_KTGGZQg@mail.gmail.com> <alpine.DEB.2.00.1205301328550.31768@router.home> <20120530184638.GU27374@one.firstfloor.org>
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On Thu, 31 May 2012, david@lang.hm wrote:

> On Wed, 30 May 2012, KOSAKI Motohiro wrote:
>
> > On Wed, May 30, 2012 at 4:10 PM, Andi Kleen <andi@firstfloor.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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