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

[david]

On Fri, 1 Jun 2012, Christoph Lameter wrote:

> Subject: Re: [PATCH 0/6] mempolicy memory corruption fixlet
>
> On Thu, 31 May 2012, david@xxxxxxx wrote:
>
> > On Wed, 30 May 2012, KOSAKI Motohiro wrote:
> >
> > > On Wed, May 30, 2012 at 4:10 PM, Andi Kleen <andi@xxxxxxxxxxxxxx> 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.

unfortunantly, not quite 100% of the time. It's very good, but the 
automount bug a month or so ago is an example of how you can run into rare 
problems. Many "enterprise" systems are not willing to risk it.

David Lang
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