On Fri, 1 Jun 2012, Christoph Lameter wrote:

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

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

quoted

On Wed, 30 May 2012, KOSAKI Motohiro wrote:

quoted

On Wed, May 30, 2012 at 4:10 PM, Andi Kleen [off-list ref] wrote:

quoted

quoted

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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