From mboxrd@z Thu Jan 1 00:00:00 1970 From: will.deacon@arm.com (Will Deacon) Date: Tue, 31 May 2016 14:15:20 +0100 Subject: [BUG] Page allocation failures with newest kernels In-Reply-To: <60e8df74202e40b28a4d53dbc7fd0b22@IL-EXCH02.marvell.com> References: <574D64A0.2070207@arm.com> <60e8df74202e40b28a4d53dbc7fd0b22@IL-EXCH02.marvell.com> Message-ID: <20160531131520.GI24936@arm.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org On Tue, May 31, 2016 at 01:10:44PM +0000, Yehuda Yitschak wrote: > During some of the stress tests we also came across a different warning > from the arm64 page management code > It looks like a race is detected between HW and SW marking a bit in the PTE A72 (which I believe is the CPU in that SoC) is a v8.0 CPU and therefore doesn't have hardware DBM. > Not sure it's really related but I thought it might give a clue on the issue > http://pastebin.com/ASv19vZP There have been a few patches from Catalin to fix up the hardware DBM patches, so it might be worth trying to reproduce this failure with a more recent kernel. I doubt this is related to the allocation failures, however. Will From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f197.google.com (mail-pf0-f197.google.com [209.85.192.197]) by kanga.kvack.org (Postfix) with ESMTP id 59D58828E1 for ; Tue, 31 May 2016 09:15:08 -0400 (EDT) Received: by mail-pf0-f197.google.com with SMTP id g64so308140821pfb.2 for ; Tue, 31 May 2016 06:15:08 -0700 (PDT) Received: from foss.arm.com (foss.arm.com. [217.140.101.70]) by mx.google.com with ESMTP id p184si7669051pfb.252.2016.05.31.06.15.07 for ; Tue, 31 May 2016 06:15:07 -0700 (PDT) Date: Tue, 31 May 2016 14:15:20 +0100 From: Will Deacon Subject: Re: [BUG] Page allocation failures with newest kernels Message-ID: <20160531131520.GI24936@arm.com> References: <574D64A0.2070207@arm.com> <60e8df74202e40b28a4d53dbc7fd0b22@IL-EXCH02.marvell.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <60e8df74202e40b28a4d53dbc7fd0b22@IL-EXCH02.marvell.com> Sender: owner-linux-mm@kvack.org List-ID: To: Yehuda Yitschak Cc: Marcin Wojtas , Robin Murphy , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Lior Amsalem , Thomas Petazzoni , Catalin Marinas , Arnd Bergmann , Grzegorz Jaszczyk , Nadav Haklai , Tomasz Nowicki , Gregory =?iso-8859-1?Q?Cl=E9ment?= On Tue, May 31, 2016 at 01:10:44PM +0000, Yehuda Yitschak wrote: > During some of the stress tests we also came across a different warning > from the arm64 page management code > It looks like a race is detected between HW and SW marking a bit in the PTE A72 (which I believe is the CPU in that SoC) is a v8.0 CPU and therefore doesn't have hardware DBM. > Not sure it's really related but I thought it might give a clue on the issue > http://pastebin.com/ASv19vZP There have been a few patches from Catalin to fix up the hardware DBM patches, so it might be worth trying to reproduce this failure with a more recent kernel. I doubt this is related to the allocation failures, however. Will -- 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 From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754170AbcEaNPK (ORCPT ); Tue, 31 May 2016 09:15:10 -0400 Received: from foss.arm.com ([217.140.101.70]:58958 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751505AbcEaNPH (ORCPT ); Tue, 31 May 2016 09:15:07 -0400 Date: Tue, 31 May 2016 14:15:20 +0100 From: Will Deacon To: Yehuda Yitschak Cc: Marcin Wojtas , Robin Murphy , "linux-mm@kvack.org" , "linux-kernel@vger.kernel.org" , "linux-arm-kernel@lists.infradead.org" , Lior Amsalem , Thomas Petazzoni , Catalin Marinas , Arnd Bergmann , Grzegorz Jaszczyk , Nadav Haklai , Tomasz Nowicki , Gregory =?iso-8859-1?Q?Cl=E9ment?= Subject: Re: [BUG] Page allocation failures with newest kernels Message-ID: <20160531131520.GI24936@arm.com> References: <574D64A0.2070207@arm.com> <60e8df74202e40b28a4d53dbc7fd0b22@IL-EXCH02.marvell.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <60e8df74202e40b28a4d53dbc7fd0b22@IL-EXCH02.marvell.com> User-Agent: Mutt/1.5.23 (2014-03-12) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Tue, May 31, 2016 at 01:10:44PM +0000, Yehuda Yitschak wrote: > During some of the stress tests we also came across a different warning > from the arm64 page management code > It looks like a race is detected between HW and SW marking a bit in the PTE A72 (which I believe is the CPU in that SoC) is a v8.0 CPU and therefore doesn't have hardware DBM. > Not sure it's really related but I thought it might give a clue on the issue > http://pastebin.com/ASv19vZP There have been a few patches from Catalin to fix up the hardware DBM patches, so it might be worth trying to reproduce this failure with a more recent kernel. I doubt this is related to the allocation failures, however. Will