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[23.128.96.18]) by mx.google.com with ESMTP id de11si1978220edb.246.2020.05.20.12.05.02; Wed, 20 May 2020 12:05:26 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) client-ip=23.128.96.18; Authentication-Results: mx.google.com; dkim=fail header.i=@gmail.com header.s=20161025 header.b=INphVoOh; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 23.128.96.18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726737AbgETTDf (ORCPT + 99 others); Wed, 20 May 2020 15:03:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42852 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726510AbgETTDf (ORCPT ); Wed, 20 May 2020 15:03:35 -0400 Received: from mail-pj1-x1044.google.com (mail-pj1-x1044.google.com [IPv6:2607:f8b0:4864:20::1044]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 13778C061A0E for ; Wed, 20 May 2020 12:03:35 -0700 (PDT) Received: by mail-pj1-x1044.google.com with SMTP id cx22so1756290pjb.1 for ; Wed, 20 May 2020 12:03:35 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:subject:to:cc:references:from:autocrypt:message-id:date :user-agent:mime-version:in-reply-to:content-language :content-transfer-encoding; bh=j0IhV4Cj9LhItTYxHJX7mGl2oZDNoRZx3jWUOP9zzNE=; b=INphVoOh8roquUhyGm3X+EBOqylIipg/0UZHgBqUeCJELmYSLQdYLlJTk03mKhA3oM aOBJrSCwJaa09lwtokihwf9/7/UA3U8dncZcBl18fJG9xLjRjAJdjBOVP2KstBpEJyD4 eo4XcP/pCA0W3AZvvl8UzG2Uf1RQWDfR3dez3mUoyvkkbF1cdy+mpwZVweUFL65fivdp zKPOJ2wVh3VTkk7CWiCl9UzY8RONTtpayTFz86o3KA5FaeVLbb+Zc62yw5PkB5/qDfO2 najC5+myaaJjviV/Vu7Fqhow3HGxWYyuRHQgrGpp2VKlZpCaLNyYRBmSwQzL1mkcDCWi AzbA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:subject:to:cc:references:from:autocrypt :message-id:date:user-agent:mime-version:in-reply-to :content-language:content-transfer-encoding; bh=j0IhV4Cj9LhItTYxHJX7mGl2oZDNoRZx3jWUOP9zzNE=; b=L4SiZwkS18YLTzh/qlOckinOPA0danlGGC4ceNFbYmpqbzq1vma8OV95RJIxYsthWQ /2kh6xN5HrJm92GVG0L4BnEx3KdF6S0dZjRk66m21T3A0O8stv8AtyG8GkhEfKStKMpj 4/pHGO97HScdfZ5NwoXTFEOTL+O3IlrqjMxyosttmITBM20o2b2sBkc/BwngOHz4ASO2 NbvfnU1QB1QYYIIDIFYfJSf0OZ84Ca7G19/qByZdEQVUBpljCegGpPedZh/zuYpThaFE 3LL/TMBb88v+gyKKzg8L+kRnCmuEvJ66eySul251P1XzuLurbe1GScAioF+ZZClIGggd 1bNw== X-Gm-Message-State: AOAM530RP9GKAQikgolZ2K7Puk8VAJ+N1LLAWUIoIEI/wEymKHLxGrjv T/SplXez1PbWvk6JdxNAs50= X-Received: by 2002:a17:90a:648c:: with SMTP id h12mr7217891pjj.229.1590001414557; Wed, 20 May 2020 12:03:34 -0700 (PDT) Received: from server.roeck-us.net ([2600:1700:e321:62f0:329c:23ff:fee3:9d7c]) by smtp.gmail.com with ESMTPSA id i8sm2360740pgr.82.2020.05.20.12.03.32 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 20 May 2020 12:03:33 -0700 (PDT) Subject: Re: [PATCH v5 04/18] sparc32: mm: Reduce allocation size for PMD and PTE tables To: Mike Rapoport , Will Deacon Cc: linux-kernel@vger.kernel.org, elver@google.com, tglx@linutronix.de, paulmck@kernel.org, mingo@kernel.org, peterz@infradead.org, "David S. Miller" 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> <20200520170306.GG1118872@kernel.org> From: Guenter Roeck Autocrypt: addr=linux@roeck-us.net; keydata= xsFNBE6H1WcBEACu6jIcw5kZ5dGeJ7E7B2uweQR/4FGxH10/H1O1+ApmcQ9i87XdZQiB9cpN RYHA7RCEK2dh6dDccykQk3bC90xXMPg+O3R+C/SkwcnUak1UZaeK/SwQbq/t0tkMzYDRxfJ7 nyFiKxUehbNF3r9qlJgPqONwX5vJy4/GvDHdddSCxV41P/ejsZ8PykxyJs98UWhF54tGRWFl 7i1xvaDB9lN5WTLRKSO7wICuLiSz5WZHXMkyF4d+/O5ll7yz/o/JxK5vO/sduYDIlFTvBZDh gzaEtNf5tQjsjG4io8E0Yq0ViobLkS2RTNZT8ICq/Jmvl0SpbHRvYwa2DhNsK0YjHFQBB0FX IdhdUEzNefcNcYvqigJpdICoP2e4yJSyflHFO4dr0OrdnGLe1Zi/8Xo/2+M1dSSEt196rXaC kwu2KgIgmkRBb3cp2vIBBIIowU8W3qC1+w+RdMUrZxKGWJ3juwcgveJlzMpMZNyM1jobSXZ0 VHGMNJ3MwXlrEFPXaYJgibcg6brM6wGfX/LBvc/haWw4yO24lT5eitm4UBdIy9pKkKmHHh7s jfZJkB5fWKVdoCv/omy6UyH6ykLOPFugl+hVL2Prf8xrXuZe1CMS7ID9Lc8FaL1ROIN/W8Vk BIsJMaWOhks//7d92Uf3EArDlDShwR2+D+AMon8NULuLBHiEUQARAQABzTJHdWVudGVyIFJv ZWNrIChMaW51eCBhY2NvdW50KSA8bGludXhAcm9lY2stdXMubmV0PsLBgQQTAQIAKwIbAwYL CQgHAwIGFQgCCQoLBBYCAwECHgECF4ACGQEFAlVcphcFCRmg06EACgkQyx8mb86fmYFg0RAA nzXJzuPkLJaOmSIzPAqqnutACchT/meCOgMEpS5oLf6xn5ySZkl23OxuhpMZTVX+49c9pvBx hpvl5bCWFu5qC1jC2eWRYU+aZZE4sxMaAGeWenQJsiG9lP8wkfCJP3ockNu0ZXXAXwIbY1O1 c+l11zQkZw89zNgWgKobKzrDMBFOYtAh0pAInZ9TSn7oA4Ctejouo5wUugmk8MrDtUVXmEA9 7f9fgKYSwl/H7dfKKsS1bDOpyJlqhEAH94BHJdK/b1tzwJCFAXFhMlmlbYEk8kWjcxQgDWMu GAthQzSuAyhqyZwFcOlMCNbAcTSQawSo3B9yM9mHJne5RrAbVz4TWLnEaX8gA5xK3uCNCeyI sqYuzA4OzcMwnnTASvzsGZoYHTFP3DQwf2nzxD6yBGCfwNGIYfS0i8YN8XcBgEcDFMWpOQhT Pu3HeztMnF3HXrc0t7e5rDW9zCh3k2PA6D2NV4fews9KDFhLlTfCVzf0PS1dRVVWM+4jVl6l HRIAgWp+2/f8dx5vPc4Ycp4IsZN0l1h9uT7qm1KTwz+sSl1zOqKD/BpfGNZfLRRxrXthvvY8 BltcuZ4+PGFTcRkMytUbMDFMF9Cjd2W9dXD35PEtvj8wnEyzIos8bbgtLrGTv/SYhmPpahJA l8hPhYvmAvpOmusUUyB30StsHIU2LLccUPPOwU0ETofVZwEQALlLbQeBDTDbwQYrj0gbx3bq 7kpKABxN2MqeuqGr02DpS9883d/t7ontxasXoEz2GTioevvRmllJlPQERVxM8gQoNg22twF7 pB/zsrIjxkE9heE4wYfN1AyzT+AxgYN6f8hVQ7Nrc9XgZZe+8IkuW/Nf64KzNJXnSH4u6nJM J2+Dt274YoFcXR1nG76Q259mKwzbCukKbd6piL+VsT/qBrLhZe9Ivbjq5WMdkQKnP7gYKCAi pNVJC4enWfivZsYupMd9qn7Uv/oCZDYoBTdMSBUblaLMwlcjnPpOYK5rfHvC4opxl+P/Vzyz 6WC2TLkPtKvYvXmdsI6rnEI4Uucg0Au/Ulg7aqqKhzGPIbVaL+U0Wk82nz6hz+WP2ggTrY1w ZlPlRt8WM9w6WfLf2j+PuGklj37m+KvaOEfLsF1v464dSpy1tQVHhhp8LFTxh/6RWkRIR2uF I4v3Xu/k5D0LhaZHpQ4C+xKsQxpTGuYh2tnRaRL14YMW1dlI3HfeB2gj7Yc8XdHh9vkpPyuT nY/ZsFbnvBtiw7GchKKri2gDhRb2QNNDyBnQn5mRFw7CyuFclAksOdV/sdpQnYlYcRQWOUGY HhQ5eqTRZjm9z+qQe/T0HQpmiPTqQcIaG/edgKVTUjITfA7AJMKLQHgp04Vylb+G6jocnQQX JqvvP09whbqrABEBAAHCwWUEGAECAA8CGwwFAlVcpi8FCRmg08MACgkQyx8mb86fmYHNRQ/+ J0OZsBYP4leJvQF8lx9zif+v4ZY/6C9tTcUv/KNAE5leyrD4IKbnV4PnbrVhjq861it/zRQW cFpWQszZyWRwNPWUUz7ejmm9lAwPbr8xWT4qMSA43VKQ7ZCeTQJ4TC8kjqtcbw41SjkjrcTG wF52zFO4bOWyovVAPncvV9eGA/vtnd3xEZXQiSt91kBSqK28yjxAqK/c3G6i7IX2rg6pzgqh hiH3/1qM2M/LSuqAv0Rwrt/k+pZXE+B4Ud42hwmMr0TfhNxG+X7YKvjKC+SjPjqp0CaztQ0H nsDLSLElVROxCd9m8CAUuHplgmR3seYCOrT4jriMFBtKNPtj2EE4DNV4s7k0Zy+6iRQ8G8ng QjsSqYJx8iAR8JRB7Gm2rQOMv8lSRdjva++GT0VLXtHULdlzg8VjDnFZ3lfz5PWEOeIMk7Rj trjv82EZtrhLuLjHRCaG50OOm0hwPSk1J64R8O3HjSLdertmw7eyAYOo4RuWJguYMg5DRnBk WkRwrSuCn7UG+qVWZeKEsFKFOkynOs3pVbcbq1pxbhk3TRWCGRU5JolI4ohy/7JV1TVbjiDI HP/aVnm6NC8of26P40Pg8EdAhajZnHHjA7FrJXsy3cyIGqvg9os4rNkUWmrCfLLsZDHD8FnU mDW4+i+XlNFUPUYMrIKi9joBhu18ssf5i5Q= Message-ID: <6034a1b5-d4f6-c836-142c-9b3b06db3246@roeck-us.net> Date: Wed, 20 May 2020 12:03:31 -0700 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.7.0 MIME-Version: 1.0 In-Reply-To: <20200520170306.GG1118872@kernel.org> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 5/20/20 10:03 AM, Mike Rapoport wrote: > On Mon, May 18, 2020 at 09:37:15AM +0100, 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 is caused by c03584e30534 ("mm: memmap_init: iterate over memblock > regions rather that check each PFN"). The commit sha is valid for > v5.7-rc6-mmots-2020-05-19-21-52, so it will change in a day or so :) > > As it seems, sparc32 never registered the memory occupied by the kernel > image with memblock_add() and it only reserves this memory with > meblock_reserve(). > > I don't know what would happen on real HW, but with > > qemu-system-sparc -kernel /path/to/kernel > > the memory occupied by the kernel is reserved in openbios and removed > from mem.available. The prom setup code in the kernel used mem.available > to set up the memory banks and essentially there is a hole for the > memory occupied by the kernel. > > Later in bootmem_init() this memory is memblock_reserve()d. > > Before the problematic commit, memmap initialization would call > __init_single_page() for the pages in that hole, the > free_low_memory_core_early() would mark them as resrved and everything > would be Ok. > > After the change in memmap initialization, the hole is skipped and the > page structs for it are not inited. And when they are passed from > memblock to page allocator as reserved it gets confused. > > Simply registering the memory occupied by the kernel with memblock_add() > resolves this issue, at least for qemu-system-arm and I cannot see how > it can harm any other setup. > > If all that makes sense I'll send a proper patch :) > > diff --git a/arch/sparc/mm/init_32.c b/arch/sparc/mm/init_32.c > index 906eda1158b4..3cb3dffcbcdc 100644 > --- a/arch/sparc/mm/init_32.c > +++ b/arch/sparc/mm/init_32.c > @@ -193,6 +193,7 @@ unsigned long __init bootmem_init(unsigned long *pages_avail) > /* Reserve the kernel text/data/bss. */ > size = (start_pfn << PAGE_SHIFT) - phys_base; > memblock_reserve(phys_base, size); > + memblock_add(phys_base, size); > > size = memblock_phys_mem_size() - memblock_reserved_size(); > *pages_avail = (size >> PAGE_SHIFT) - high_pages; > >> Will > With above patch applied on top of Ira's patch, I get: BUG: spinlock recursion on CPU#0, S01syslogd/139 lock: 0xf5448350, .magic: dead4ead, .owner: S01syslogd/139, .owner_cpu: 0 CPU: 0 PID: 139 Comm: S01syslogd Not tainted 5.7.0-rc6-next-20200518-00002-gb178d2d56f29-dirty #1 [f0067a64 : do_raw_spin_lock+0xa8/0xd8 ] [f00d5034 : copy_page_range+0x328/0x804 ] [f0025be4 : dup_mm+0x334/0x434 ] [f0027124 : copy_process+0x1224/0x12b0 ] [f0027344 : _do_fork+0x54/0x30c ] [f0027670 : do_fork+0x5c/0x6c ] [f000de44 : sparc_do_fork+0x18/0x38 ] [f000b7f4 : do_syscall+0x34/0x40 ] [5010cd4c : 0x5010cd4c ] Looks like yet another problem. I can not revert c03584e30534 because it results in a compile failure. Guenter