From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail202.messagelabs.com (mail202.messagelabs.com [216.82.254.227]) by kanga.kvack.org (Postfix) with ESMTP id DAE036B004F for ; Wed, 12 Aug 2009 04:46:13 -0400 (EDT) Date: Wed, 12 Aug 2009 10:46:13 +0200 From: Nick Piggin Subject: Re: [PATCH] [16/19] HWPOISON: Enable .remove_error_page for migration aware file systems Message-ID: <20090812084613.GB32342@wotan.suse.de> References: <200908051136.682859934@firstfloor.org> <20090805093643.E0C00B15D8@basil.firstfloor.org> <4A7FBFD1.2010208@hitachi.com> <20090810074421.GA6838@basil.fritz.box> <4A80EAA3.7040107@hitachi.com> <20090811071756.GC14368@basil.fritz.box> <20090812080540.GA32342@wotan.suse.de> <20090812082331.GD28848@basil.fritz.box> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20090812082331.GD28848@basil.fritz.box> Sender: owner-linux-mm@kvack.org To: Andi Kleen Cc: Hidehiro Kawai , tytso@mit.edu, hch@infradead.org, mfasheh@suse.com, aia21@cantab.net, hugh.dickins@tiscali.co.uk, swhiteho@redhat.com, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, fengguang.wu@intel.com, Satoshi OSHIMA , Taketoshi Sakuraba List-ID: On Wed, Aug 12, 2009 at 10:23:31AM +0200, Andi Kleen wrote: > > page corruption, IMO, because by definition they should be able to > > tolerate panic. But if they do not know about this change to -EIO > > semantics, then it is quite possible to cause problems. > > There's no change really. You already have this problem with > any metadata error, which can cause similar trouble. > If the application handles those correctly it will also > handle hwpoison correctly. What do you mean metadata error? To be clear, we're talking about safety given by a panic on any memory error, versus safety of this hwpoison code (specifically which removes dirty pagecache pages as -EIO). -- 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/ . Don't email: email@kvack.org