From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail190.messagelabs.com (mail190.messagelabs.com [216.82.249.51]) by kanga.kvack.org (Postfix) with ESMTP id 46AAC8D0040 for ; Sat, 26 Mar 2011 15:31:00 -0400 (EDT) Received: from mail-iy0-f169.google.com (mail-iy0-f169.google.com [209.85.210.169]) (authenticated bits=0) by smtp1.linux-foundation.org (8.14.2/8.13.5/Debian-3ubuntu1.1) with ESMTP id p2QJUuSV007834 (version=TLSv1/SSLv3 cipher=RC4-SHA bits=128 verify=FAIL) for ; Sat, 26 Mar 2011 12:30:56 -0700 Received: by iyf13 with SMTP id 13so3127007iyf.14 for ; Sat, 26 Mar 2011 12:30:56 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <20110324142146.GA11682@elte.hu> <20110324172653.GA28507@elte.hu> <20110324185258.GA28370@elte.hu> <20110324192247.GA5477@elte.hu> <20110326112725.GA28612@elte.hu> <20110326114736.GA8251@elte.hu> <1301161507.2979.105.camel@edumazet-laptop> From: Linus Torvalds Date: Sat, 26 Mar 2011 12:30:36 -0700 Message-ID: Subject: Re: [PATCH] slub: Disable the lockless allocator Content-Type: text/plain; charset=ISO-8859-1 Sender: owner-linux-mm@kvack.org List-ID: To: Christoph Lameter Cc: Eric Dumazet , Ingo Molnar , Pekka Enberg , Thomas Gleixner , akpm@linux-foundation.org, tj@kernel.org, npiggin@kernel.dk, rientjes@google.com, linux-kernel@vger.kernel.org, linux-mm@kvack.org On Sat, Mar 26, 2011 at 12:18 PM, Christoph Lameter wrote: > > Right. RSI should be in the range of the values you printed. > However, the determination RSI is independent of the emulation of the > instruction. If RSI is set wrong then we should see these failures on > machines that do not do the instruction emulation. A kvm run with Ingo's > config should show the same issues. Will do that now. I bet it's timing-dependent and/or dependent on some code layout issue. Why else would the totally pointless previous patch have made any difference for Ingo (the "SLUB: Write to per cpu data when allocating it" thing seems to be pure voodoo programming)? That said, this early in the boot I don't think we should have any parallelism going on, so I don't see what could make those kinds of random effects. Linus -- 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