From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx167.postini.com [74.125.245.167]) by kanga.kvack.org (Postfix) with SMTP id 1A42B6B004D for ; Fri, 1 Jun 2012 15:37:59 -0400 (EDT) Received: by ggm4 with SMTP id 4so2723103ggm.14 for ; Fri, 01 Jun 2012 12:37:58 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: 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> From: KOSAKI Motohiro Date: Fri, 1 Jun 2012 15:37:37 -0400 Message-ID: Subject: Re: [PATCH 0/6] mempolicy memory corruption fixlet Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: david@lang.hm Cc: Christoph Lameter , 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 >>>>>> 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. Then we can remove a feature safely. Risk not taker continue to uses old distro kernel. And some years after, distros discontinue to support 32bit. And then, problem will vanish automatically. -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: email@kvack.org