From mboxrd@z Thu Jan 1 00:00:00 1970 From: Peter Zijlstra Subject: Re: [RFC] page-table walkers vs memory order Date: Thu, 26 Jul 2012 10:11:39 +0200 Message-ID: <1343290299.26034.84.camel@twins> References: <1343064870.26034.23.camel@twins> <20120725175628.GH2378@linux.vnet.ibm.com> <20120725211217.GR2378@linux.vnet.ibm.com> Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7BIT Return-path: Received: from casper.infradead.org ([85.118.1.10]:54245 "EHLO casper.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750867Ab2GZILt convert rfc822-to-8bit (ORCPT ); Thu, 26 Jul 2012 04:11:49 -0400 In-Reply-To: Sender: linux-arch-owner@vger.kernel.org List-ID: To: Hugh Dickins Cc: "Paul E. McKenney" , Linus Torvalds , Rik van Riel , Andrew Morton , Nick Piggin , Andrea Arcangeli , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org On Wed, 2012-07-25 at 15:09 -0700, Hugh Dickins wrote: > We find out after it hits us, and someone studies the disassembly - > if we're lucky enough to crash near the origin of the problem. This is a rather painful way.. see https://lkml.org/lkml/2009/1/5/555 we were lucky there in that the lack of ACCESS_ONCE() caused an infinite loop so we knew exactly where we got stuck. From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from psmtp.com (na3sys010amx189.postini.com [74.125.245.189]) by kanga.kvack.org (Postfix) with SMTP id BA9EE6B004D for ; Thu, 26 Jul 2012 04:11:45 -0400 (EDT) Message-ID: <1343290299.26034.84.camel@twins> Subject: Re: [RFC] page-table walkers vs memory order From: Peter Zijlstra Date: Thu, 26 Jul 2012 10:11:39 +0200 In-Reply-To: References: <1343064870.26034.23.camel@twins> <20120725175628.GH2378@linux.vnet.ibm.com> <20120725211217.GR2378@linux.vnet.ibm.com> Content-Type: text/plain; charset="ISO-8859-1" Content-Transfer-Encoding: quoted-printable Mime-Version: 1.0 Sender: owner-linux-mm@kvack.org List-ID: To: Hugh Dickins Cc: "Paul E. McKenney" , Linus Torvalds , Rik van Riel , Andrew Morton , Nick Piggin , Andrea Arcangeli , linux-kernel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org On Wed, 2012-07-25 at 15:09 -0700, Hugh Dickins wrote: > We find out after it hits us, and someone studies the disassembly - > if we're lucky enough to crash near the origin of the problem.=20 This is a rather painful way.. see https://lkml.org/lkml/2009/1/5/555 we were lucky there in that the lack of ACCESS_ONCE() caused an infinite loop so we knew exactly where we got stuck. -- 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