Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932939Ab2FATcB (ORCPT ); Fri, 1 Jun 2012 15:32:01 -0400 Received: from mail.lang.hm ([64.81.33.126]:37034 "EHLO bifrost.lang.hm" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755085Ab2FATb7 (ORCPT ); Fri, 1 Jun 2012 15:31:59 -0400 Date: Fri, 1 Jun 2012 12:31:33 -0700 (PDT) From: david@lang.hm X-X-Sender: dlang@asgard.lang.hm To: Christoph Lameter cc: KOSAKI Motohiro , Andi Kleen , Linus Torvalds , linux-kernel@vger.kernel.org, linux-mm@kvack.org, Andrew Morton , Dave Jones , Mel Gorman , stable@vger.kernel.org, hughd@google.com, sivanich@sgi.com Subject: Re: [PATCH 0/6] mempolicy memory corruption fixlet In-Reply-To: Message-ID: References: <1338368529-21784-1-git-send-email-kosaki.motohiro@gmail.com> <20120530184638.GU27374@one.firstfloor.org> <20120530193234.GV27374@one.firstfloor.org> <20120530201042.GY27374@one.firstfloor.org> User-Agent: Alpine 2.02 (DEB 1266 2009-07-14) MIME-Version: 1.0 Content-Type: TEXT/PLAIN; charset=US-ASCII; format=flowed Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1543 Lines: 37 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: > >> On Wed, 30 May 2012, KOSAKI Motohiro wrote: >> >>> On Wed, May 30, 2012 at 4:10 PM, Andi Kleen 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 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/