From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf0-f198.google.com (mail-pf0-f198.google.com [209.85.192.198]) by kanga.kvack.org (Postfix) with ESMTP id 3F68C6B0069 for ; Fri, 13 Jan 2017 08:15:17 -0500 (EST) Received: by mail-pf0-f198.google.com with SMTP id y143so124635725pfb.6 for ; Fri, 13 Jan 2017 05:15:17 -0800 (PST) Received: from NAM02-SN1-obe.outbound.protection.outlook.com (mail-sn1nam02on0086.outbound.protection.outlook.com. [104.47.36.86]) by mx.google.com with ESMTPS id 62si12732524ply.143.2017.01.13.05.15.16 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-SHA bits=128/128); Fri, 13 Jan 2017 05:15:16 -0800 (PST) Date: Fri, 13 Jan 2017 14:15:00 +0100 From: Robert Richter Subject: Re: [PATCH v3] arm64: mm: Fix NOMAP page initialization Message-ID: <20170113131500.GS4930@rric.localdomain> References: <20161216165437.21612-1-rrichter@cavium.com> <20170109115320.GI4930@rric.localdomain> <20170112160535.GF13843@arm.com> <20170112185825.GE5020@rric.localdomain> <20170113091903.GA22538@arm.com> MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Disposition: inline In-Reply-To: <20170113091903.GA22538@arm.com> Sender: owner-linux-mm@kvack.org List-ID: To: Will Deacon Cc: Ard Biesheuvel , Hanjun Guo , Russell King , Catalin Marinas , David Daney , Mark Rutland , James Morse , Yisheng Xie , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" , "linux-mm@kvack.org" On 13.01.17 09:19:04, Will Deacon wrote: > On Thu, Jan 12, 2017 at 07:58:25PM +0100, Robert Richter wrote: > > On 12.01.17 16:05:36, Will Deacon wrote: > > > On Mon, Jan 09, 2017 at 12:53:20PM +0100, Robert Richter wrote: > > > > > > Kernel compile times (3 runs each): > > > > > > > > pfn_valid_within(): > > > > > > > > real 6m4.088s > > > > user 372m57.607s > > > > sys 16m55.158s > > > > > > > > real 6m1.532s > > > > user 372m48.453s > > > > sys 16m50.370s > > > > > > > > real 6m4.061s > > > > user 373m18.753s > > > > sys 16m57.027s > > > > > > Did you reboot the machine between each build here, or only when changing > > > kernel? If the latter, do you see variations in kernel build time by simply > > > rebooting the same Image? > > > > I built it in a loop on the shell, so no reboots between builds. Note > > that I was building the kernel in /dev/shm to not access harddisks. I > > think build times should be comparable then since there is no fs > > caching. > > I guess I'm really asking what the standard deviation is if you *do* reboot > between builds, using the same kernel. It's hard to tell whether the numbers > are due to the patches, or just because of noise incurred by the way things > happen to initialise. Ok, I am going to test this. -Robert -- 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