From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.3 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,USER_AGENT_SANE_1 autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id AA3CFC433DF for ; Mon, 18 May 2020 18:21:31 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9592F20643 for ; Mon, 18 May 2020 18:21:31 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2387855AbgERSVb (ORCPT ); Mon, 18 May 2020 14:21:31 -0400 Received: from mga18.intel.com ([134.134.136.126]:25025 "EHLO mga18.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1731059AbgERSV3 (ORCPT ); Mon, 18 May 2020 14:21:29 -0400 IronPort-SDR: /CHKg+F+kKGPVhSLo5QVa8NT/C4QeeL8zcA+KvNC2sJooXBo+ZFotMUkp+WY6UWpdPTQBR0rl7 BFP1fzmiTZwA== X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False Received: from orsmga004.jf.intel.com ([10.7.209.38]) by orsmga106.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 18 May 2020 11:21:28 -0700 IronPort-SDR: aLZL/bfb/qZo1KU95odrebxhUWR287im03hp/XSbmZhst44S5LoX7sXcy3LR78oZi5T9kBe7tL QDLzyr6iUcXg== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.73,407,1583222400"; d="scan'208";a="411353713" Received: from iweiny-desk2.sc.intel.com ([10.3.52.147]) by orsmga004.jf.intel.com with ESMTP; 18 May 2020 11:21:28 -0700 Date: Mon, 18 May 2020 11:21:28 -0700 From: Ira Weiny To: Guenter Roeck Cc: Mike Rapoport , Will Deacon , linux-kernel@vger.kernel.org, elver@google.com, tglx@linutronix.de, paulmck@kernel.org, mingo@kernel.org, peterz@infradead.org, "David S. Miller" Subject: Re: [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables Message-ID: <20200518182127.GC3028105@iweiny-DESK2.sc.intel.com> References: <20200511204150.27858-1-will@kernel.org> <20200511204150.27858-5-will@kernel.org> <20200517000050.GA87467@roeck-us.net> <20200517000750.GA157503@roeck-us.net> <20200518083715.GA31383@willie-the-truck> <418aa44b-6fb3-c3d8-a920-1a26e5edec62@roeck-us.net> <20200518142310.GC1118872@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: User-Agent: Mutt/1.11.1 (2018-12-01) Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, May 18, 2020 at 11:09:46AM -0700, Guenter Roeck wrote: > On 5/18/20 7:23 AM, Mike Rapoport wrote: > > On Mon, May 18, 2020 at 02:48:18AM -0700, Guenter Roeck wrote: > >> On 5/18/20 1:37 AM, Will Deacon wrote: > >>> On Sat, May 16, 2020 at 05:07:50PM -0700, Guenter Roeck wrote: > >>>> On Sat, May 16, 2020 at 05:00:50PM -0700, Guenter Roeck wrote: > >>>>> On Mon, May 11, 2020 at 09:41:36PM +0100, Will Deacon wrote: > >>>>>> Now that the page table allocator can free page table allocations > >>>>>> smaller than PAGE_SIZE, reduce the size of the PMD and PTE allocations > >>>>>> to avoid needlessly wasting memory. > >>>>>> > >>>>>> Cc: "David S. Miller" > >>>>>> Cc: Peter Zijlstra > >>>>>> Signed-off-by: Will Deacon > >>>>> > >>>>> Something in the sparc32 patches in linux-next causes all my sparc32 emulations > >>>>> to crash. bisect points to this patch, but reverting it doesn't help, and neither > >>>>> does reverting the rest of the series. > >>>>> > >>>> Actually, turns out I see the same pattern (lots of scheduling while atomic > >>>> followed by 'killing interrupt handler' in cryptomgr_test) with several > >>>> powerpc boot tests. I am currently bisecting those crashes. I'll report > >>>> the results here as well as soon as I have it. > >>> > >>> FWIW, I retested my sparc32 patches with PREEMPT=y and I don't see any > >>> issues. However, linux-next is a different story, where I don't get very far > >>> at all: > >>> > >>> BUG: Bad page state in process swapper pfn:005b4 > > > > This one seems to be due to commit 24aab577764f ("mm: memmap_init: > > iterate over memblock regions rather that check each PFN") and reverting > > it and partially reverting the next cleanup commits makes those > > dissapear. sparc32 boot still fails on today's linux-next and mmotm for me with > > > > Run /sbin/init as init process > > with arguments: > > /sbin/init > > with environment: > > HOME=/ > > TERM=linux > > Starting init: /sbin/init exists but couldn't execute it (error -14) > > > > I've tried to bisect mmotm and I've got the first bad commits in > > different places in the middle of arch/kmap series [1] so I've added Ira > > to CC as well :) > > > > I'll continue to look into "bad page" on sparc32 mips is broken too. Does anyone know what this FIXME was for? ... if (vaddr < FIXADDR_START) { // FIXME ... I'm going to remove it... Ira