From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-pf1-f194.google.com (mail-pf1-f194.google.com [209.85.210.194]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by lists.ozlabs.org (Postfix) with ESMTPS id 4255h52kZnzF38D for ; Thu, 6 Sep 2018 00:29:56 +1000 (AEST) Received: by mail-pf1-f194.google.com with SMTP id d4-v6so3591185pfn.0 for ; Wed, 05 Sep 2018 07:29:56 -0700 (PDT) Sender: Guenter Roeck Date: Wed, 5 Sep 2018 07:29:51 -0700 From: Guenter Roeck To: Nicholas Piggin Cc: linux-mm@kvack.org, linux-arch@vger.kernel.org, linux-kernel@vger.kernel.org, linuxppc-dev@lists.ozlabs.org, Andrew Morton , Linus Torvalds , Ley Foon Tan , nios2-dev@lists.rocketboards.org Subject: Re: [PATCH 3/3] mm: optimise pte dirty/accessed bit setting by demand based pte insertion Message-ID: <20180905142951.GA15680@roeck-us.net> References: <20180828112034.30875-1-npiggin@gmail.com> <20180828112034.30875-4-npiggin@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=iso-8859-1 In-Reply-To: <20180828112034.30875-4-npiggin@gmail.com> List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Hi, On Tue, Aug 28, 2018 at 09:20:34PM +1000, Nicholas Piggin wrote: > Similarly to the previous patch, this tries to optimise dirty/accessed > bits in ptes to avoid access costs of hardware setting them. > This patch results in silent nios2 boot failures, silent meaning that the boot stalls. ... Unpacking initramfs... Freeing initrd memory: 2168K workingset: timestamp_bits=30 max_order=15 bucket_order=0 jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc. random: fast init done random: crng init done [no further activity until the qemu session is aborted] Reverting the patch fixes the problem. Bisect log is attached. Guenter --- # bad: [387ac6229ecf6e012649d4fc409c5352655a4cf0] Add linux-next specific files for 20180905 # good: [57361846b52bc686112da6ca5368d11210796804] Linux 4.19-rc2 git bisect start 'HEAD' 'v4.19-rc2' # good: [668570e8389bb076bea9b7531553e1362f5abd11] Merge remote-tracking branch 'net-next/master' git bisect good 668570e8389bb076bea9b7531553e1362f5abd11 # good: [7f2f69ebf0bcf3e9bcff7d560ba92cee960a66a6] Merge remote-tracking branch 'battery/for-next' git bisect good 7f2f69ebf0bcf3e9bcff7d560ba92cee960a66a6 # good: [c31458d3e03e3a2edeaab225a22eaf68c07c8290] Merge remote-tracking branch 'rpmsg/for-next' git bisect good c31458d3e03e3a2edeaab225a22eaf68c07c8290 # good: [e0f43dcbe9af8ac72f39fe92c5d0ee1883546427] Merge remote-tracking branch 'nvdimm/libnvdimm-for-next' git bisect good e0f43dcbe9af8ac72f39fe92c5d0ee1883546427 # bad: [f509e2c0f3cd11df238f0f1b5ba013fe726decdf] of: ignore sub-page memory regions git bisect bad f509e2c0f3cd11df238f0f1b5ba013fe726decdf # good: [2f7eebf30b87534f7e4c3982307579d9adc782a5] ocfs2: fix clusters leak in ocfs2_defrag_extent() git bisect good 2f7eebf30b87534f7e4c3982307579d9adc782a5 # good: [119eb88c9dd23e305939ad748237100078e304a8] mm/swapfile.c: call free_swap_slot() in __swap_entry_free() git bisect good 119eb88c9dd23e305939ad748237100078e304a8 # good: [21d64d37adf3ab20b4c3a1951018e84bf815c887] mm: remove vm_insert_pfn() git bisect good 21d64d37adf3ab20b4c3a1951018e84bf815c887 # good: [90cd1a69010844e9dbfc43279d681d798812b962] cramfs: convert to use vmf_insert_mixed git bisect good 90cd1a69010844e9dbfc43279d681d798812b962 # good: [c7dd91289b4bb4c400a8a71953511991815f8e6f] mm/cow: optimise pte dirty/accessed bits handling in fork git bisect good c7dd91289b4bb4c400a8a71953511991815f8e6f # bad: [87d74ae75700a39effcb8c9ed8a8445e719ac369] hexagon: switch to NO_BOOTMEM git bisect bad 87d74ae75700a39effcb8c9ed8a8445e719ac369 # bad: [3d1d5b26ac5b4d4193dc618a50cd88de1fb0d360] mm: optimise pte dirty/accessed bit setting by demand based pte insertion git bisect bad 3d1d5b26ac5b4d4193dc618a50cd88de1fb0d360 # first bad commit: [3d1d5b26ac5b4d4193dc618a50cd88de1fb0d360] mm: optimise pte dirty/accessed bit setting by demand based pte insertion