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 Received: from kanga.kvack.org (kanga.kvack.org [205.233.56.17]) by smtp.lore.kernel.org (Postfix) with ESMTP id D0145C25B46 for ; Mon, 23 Oct 2023 17:22:32 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 695856B012D; Mon, 23 Oct 2023 13:22:32 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 645EC6B012E; Mon, 23 Oct 2023 13:22:32 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 4BEFA6B012F; Mon, 23 Oct 2023 13:22:32 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0014.hostedemail.com [216.40.44.14]) by kanga.kvack.org (Postfix) with ESMTP id 3866A6B012D for ; Mon, 23 Oct 2023 13:22:32 -0400 (EDT) Received: from smtpin13.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay01.hostedemail.com (Postfix) with ESMTP id 08E3F1CB4E7 for ; Mon, 23 Oct 2023 17:22:32 +0000 (UTC) X-FDA: 81377395344.13.2FCA24B Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf11.hostedemail.com (Postfix) with ESMTP id 90EB740014 for ; Mon, 23 Oct 2023 17:22:29 +0000 (UTC) Authentication-Results: imf11.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=GyphF4G0; spf=pass (imf11.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1698081749; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=7tOvXGzE2NpQ6tZnzJg9WmExIPulJp9KgVxJ9uvAFEE=; b=iCiYfdsdCQh1UMIgp2nb7d5tFbMX5Xie0x+DOFFfEUPYDsL12IIce6si3hoS6iGI3bWxKY 1y1etxy3Zl+myCQNnjfk/knIHV5lKULCw1n37MG/oXTZvvFIeGrd16f/RY5k6n9DjcQeX1 JDa3z3bXSUjD7qFX9V4nvcyACuF3XQU= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1698081749; a=rsa-sha256; cv=none; b=Et7IE0WSYkGCDZdeoERCSw/vq9rtxXytDaZTolesgmJpHGuQp0mvGjmPI/TrSYWkA34O9c 1BSaOZrIOCogPh6ePX2JF5Q6hHIlWdd/ZflgGT/aKh/6IW5w3AHTIaMbjA2FVbNlwcHwY9 WvtlAEAhWJgqp/wG5n0FDQVWUKTI8fg= ARC-Authentication-Results: i=1; imf11.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=GyphF4G0; spf=pass (imf11.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=none) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1698081748; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:autocrypt:autocrypt; bh=7tOvXGzE2NpQ6tZnzJg9WmExIPulJp9KgVxJ9uvAFEE=; b=GyphF4G0vrVR7sXCSJ9JiRDT9z6dcrYENilcKb1HZE0098ss+KSNXRd64Vk39sHIonmI8g 6NgW1AvLtIoNDU1eV/5UffdVIFJ0Jdpciv1RSEeQuC9SWrKIhgzcs8X/wygSp1KdVDC3/3 p6HuJWNQshufhhPv70dQEvzTjWYNC6M= Received: from mail-wr1-f72.google.com (mail-wr1-f72.google.com [209.85.221.72]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-228-3U8FFxSeMU-wwFXugxmv7Q-1; Mon, 23 Oct 2023 13:22:27 -0400 X-MC-Unique: 3U8FFxSeMU-wwFXugxmv7Q-1 Received: by mail-wr1-f72.google.com with SMTP id ffacd0b85a97d-32d9b520d15so1450938f8f.3 for ; Mon, 23 Oct 2023 10:22:27 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1698081746; x=1698686546; h=content-transfer-encoding:in-reply-to:organization:autocrypt:from :references:cc:to:content-language:subject:user-agent:mime-version :date:message-id:x-gm-message-state:from:to:cc:subject:date :message-id:reply-to; bh=7tOvXGzE2NpQ6tZnzJg9WmExIPulJp9KgVxJ9uvAFEE=; b=PXUr3Wd72XTCu5HplE46l7M9UQK6l3XZdKm1F1lm4sB6h+k6t+iDvrZiedd6fdPxG7 BguseZRTI4euML5maG6YWu4scbdLQFi4MxdAH3/wtx3vabx1RnnrbUNpI1JYQg7iDOe3 fG7ngvg+fNBKm6QKzfAyOJFaisofMCoipJLGDJ3Gb+Pf5v3GA7PzddaNtMqdRf+sVl+Q IIw0RYHBpJeQoIsFTESw+agScd0YGvvdeNY63k2PtNHdw2mEaoU7haJubYG8Wl6lj8F+ c3jpYnb/NaZcfQ1LO58cB5UHFzwOw7QeElEmrXUi9hcXFf6V6gJ9NnjErnyYMSeGYPUT Uw5Q== X-Gm-Message-State: AOJu0YxVRIqZN3fUjEgCj+oxzxwt+ujNXKRtLH3i4rvexUkvWuxM0Apc e68U/WX/eAkP53nQW2+X3iAyaIcCNzHMmXXMWkBbiHRdwNMfgpmxbG0tuAqgV1qzB/MkUp0bOrA x5Pdkp+wtwts= X-Received: by 2002:a5d:5267:0:b0:31f:f65f:74ac with SMTP id l7-20020a5d5267000000b0031ff65f74acmr8224005wrc.70.1698081746204; Mon, 23 Oct 2023 10:22:26 -0700 (PDT) X-Google-Smtp-Source: AGHT+IFCMOI1KN9UzvpFgp9lfJ0fqVHI9JbN2l0Rq7ZKvD1mIJErINDA2Vo0dhINX9e9eZUR/WKTYg== X-Received: by 2002:a5d:5267:0:b0:31f:f65f:74ac with SMTP id l7-20020a5d5267000000b0031ff65f74acmr8223956wrc.70.1698081745763; Mon, 23 Oct 2023 10:22:25 -0700 (PDT) Received: from ?IPV6:2003:cb:c738:1900:b6ea:5b9:62c0:34e? (p200300cbc7381900b6ea05b962c0034e.dip0.t-ipconnect.de. [2003:cb:c738:1900:b6ea:5b9:62c0:34e]) by smtp.gmail.com with ESMTPSA id u16-20020adff890000000b0032d8ce46caasm8184399wrp.93.2023.10.23.10.22.23 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 23 Oct 2023 10:22:25 -0700 (PDT) Message-ID: <11fa8d5a-483f-4460-acc0-79ba4eabc4c5@redhat.com> Date: Mon, 23 Oct 2023 19:22:23 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH RFC 06/37] mm: page_alloc: Allocate from movable pcp lists only if ALLOC_FROM_METADATA To: Catalin Marinas Cc: Hyesoo Yu , Alexandru Elisei , will@kernel.org, oliver.upton@linux.dev, maz@kernel.org, james.morse@arm.com, suzuki.poulose@arm.com, yuzenghui@huawei.com, arnd@arndb.de, akpm@linux-foundation.org, mingo@redhat.com, peterz@infradead.org, juri.lelli@redhat.com, vincent.guittot@linaro.org, dietmar.eggemann@arm.com, rostedt@goodmis.org, bsegall@google.com, mgorman@suse.de, bristot@redhat.com, vschneid@redhat.com, mhiramat@kernel.org, rppt@kernel.org, hughd@google.com, pcc@google.com, steven.price@arm.com, anshuman.khandual@arm.com, vincenzo.frascino@arm.com, eugenis@google.com, kcc@google.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, kvmarm@lists.linux.dev, linux-fsdevel@vger.kernel.org, linux-arch@vger.kernel.org, linux-mm@kvack.org References: <20230823131350.114942-1-alexandru.elisei@arm.com> <20230823131350.114942-7-alexandru.elisei@arm.com> <20231010074823.GA2536665@tiffany> <20231023071656.GA344850@tiffany> <25fad62e-b1d9-4d63-9d95-08c010756231@redhat.com> From: David Hildenbrand Autocrypt: addr=david@redhat.com; keydata= xsFNBFXLn5EBEAC+zYvAFJxCBY9Tr1xZgcESmxVNI/0ffzE/ZQOiHJl6mGkmA1R7/uUpiCjJ dBrn+lhhOYjjNefFQou6478faXE6o2AhmebqT4KiQoUQFV4R7y1KMEKoSyy8hQaK1umALTdL QZLQMzNE74ap+GDK0wnacPQFpcG1AE9RMq3aeErY5tujekBS32jfC/7AnH7I0v1v1TbbK3Gp XNeiN4QroO+5qaSr0ID2sz5jtBLRb15RMre27E1ImpaIv2Jw8NJgW0k/D1RyKCwaTsgRdwuK Kx/Y91XuSBdz0uOyU/S8kM1+ag0wvsGlpBVxRR/xw/E8M7TEwuCZQArqqTCmkG6HGcXFT0V9 PXFNNgV5jXMQRwU0O/ztJIQqsE5LsUomE//bLwzj9IVsaQpKDqW6TAPjcdBDPLHvriq7kGjt WhVhdl0qEYB8lkBEU7V2Yb+SYhmhpDrti9Fq1EsmhiHSkxJcGREoMK/63r9WLZYI3+4W2rAc UucZa4OT27U5ZISjNg3Ev0rxU5UH2/pT4wJCfxwocmqaRr6UYmrtZmND89X0KigoFD/XSeVv jwBRNjPAubK9/k5NoRrYqztM9W6sJqrH8+UWZ1Idd/DdmogJh0gNC0+N42Za9yBRURfIdKSb B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzSREYXZpZCBIaWxk ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZgEEwEIAEICGwMGCwkIBwMCBhUIAgkKCwQW AgMBAh4BAheAAhkBFiEEG9nKrXNcTDpGDfzKTd4Q9wD/g1oFAl8Ox4kFCRKpKXgACgkQTd4Q 9wD/g1oHcA//a6Tj7SBNjFNM1iNhWUo1lxAja0lpSodSnB2g4FCZ4R61SBR4l/psBL73xktp rDHrx4aSpwkRP6Epu6mLvhlfjmkRG4OynJ5HG1gfv7RJJfnUdUM1z5kdS8JBrOhMJS2c/gPf wv1TGRq2XdMPnfY2o0CxRqpcLkx4vBODvJGl2mQyJF/gPepdDfcT8/PY9BJ7FL6Hrq1gnAo4 3Iv9qV0JiT2wmZciNyYQhmA1V6dyTRiQ4YAc31zOo2IM+xisPzeSHgw3ONY/XhYvfZ9r7W1l pNQdc2G+o4Di9NPFHQQhDw3YTRR1opJaTlRDzxYxzU6ZnUUBghxt9cwUWTpfCktkMZiPSDGd KgQBjnweV2jw9UOTxjb4LXqDjmSNkjDdQUOU69jGMUXgihvo4zhYcMX8F5gWdRtMR7DzW/YE BgVcyxNkMIXoY1aYj6npHYiNQesQlqjU6azjbH70/SXKM5tNRplgW8TNprMDuntdvV9wNkFs 9TyM02V5aWxFfI42+aivc4KEw69SE9KXwC7FSf5wXzuTot97N9Phj/Z3+jx443jo2NR34XgF 89cct7wJMjOF7bBefo0fPPZQuIma0Zym71cP61OP/i11ahNye6HGKfxGCOcs5wW9kRQEk8P9 M/k2wt3mt/fCQnuP/mWutNPt95w9wSsUyATLmtNrwccz63XOwU0EVcufkQEQAOfX3n0g0fZz Bgm/S2zF/kxQKCEKP8ID+Vz8sy2GpDvveBq4H2Y34XWsT1zLJdvqPI4af4ZSMxuerWjXbVWb T6d4odQIG0fKx4F8NccDqbgHeZRNajXeeJ3R7gAzvWvQNLz4piHrO/B4tf8svmRBL0ZB5P5A 2uhdwLU3NZuK22zpNn4is87BPWF8HhY0L5fafgDMOqnf4guJVJPYNPhUFzXUbPqOKOkL8ojk CXxkOFHAbjstSK5Ca3fKquY3rdX3DNo+EL7FvAiw1mUtS+5GeYE+RMnDCsVFm/C7kY8c2d0G NWkB9pJM5+mnIoFNxy7YBcldYATVeOHoY4LyaUWNnAvFYWp08dHWfZo9WCiJMuTfgtH9tc75 7QanMVdPt6fDK8UUXIBLQ2TWr/sQKE9xtFuEmoQGlE1l6bGaDnnMLcYu+Asp3kDT0w4zYGsx 5r6XQVRH4+5N6eHZiaeYtFOujp5n+pjBaQK7wUUjDilPQ5QMzIuCL4YjVoylWiBNknvQWBXS lQCWmavOT9sttGQXdPCC5ynI+1ymZC1ORZKANLnRAb0NH/UCzcsstw2TAkFnMEbo9Zu9w7Kv AxBQXWeXhJI9XQssfrf4Gusdqx8nPEpfOqCtbbwJMATbHyqLt7/oz/5deGuwxgb65pWIzufa N7eop7uh+6bezi+rugUI+w6DABEBAAHCwXwEGAEIACYCGwwWIQQb2cqtc1xMOkYN/MpN3hD3 AP+DWgUCXw7HsgUJEqkpoQAKCRBN3hD3AP+DWrrpD/4qS3dyVRxDcDHIlmguXjC1Q5tZTwNB boaBTPHSy/Nksu0eY7x6HfQJ3xajVH32Ms6t1trDQmPx2iP5+7iDsb7OKAb5eOS8h+BEBDeq 3ecsQDv0fFJOA9ag5O3LLNk+3x3q7e0uo06XMaY7UHS341ozXUUI7wC7iKfoUTv03iO9El5f XpNMx/YrIMduZ2+nd9Di7o5+KIwlb2mAB9sTNHdMrXesX8eBL6T9b+MZJk+mZuPxKNVfEQMQ a5SxUEADIPQTPNvBewdeI80yeOCrN+Zzwy/Mrx9EPeu59Y5vSJOx/z6OUImD/GhX7Xvkt3kq Er5KTrJz3++B6SH9pum9PuoE/k+nntJkNMmQpR4MCBaV/J9gIOPGodDKnjdng+mXliF3Ptu6 3oxc2RCyGzTlxyMwuc2U5Q7KtUNTdDe8T0uE+9b8BLMVQDDfJjqY0VVqSUwImzTDLX9S4g/8 kC4HRcclk8hpyhY2jKGluZO0awwTIMgVEzmTyBphDg/Gx7dZU1Xf8HFuE+UZ5UDHDTnwgv7E th6RC9+WrhDNspZ9fJjKWRbveQgUFCpe1sa77LAw+XFrKmBHXp9ZVIe90RMe2tRL06BGiRZr jPrnvUsUUsjRoRNJjKKA/REq+sAnhkNPPZ/NNMjaZ5b8Tovi8C0tmxiCHaQYqj7G2rgnT0kt WNyWQQ== Organization: Red Hat In-Reply-To: X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 90EB740014 X-Rspam-User: X-Rspamd-Server: rspam11 X-Stat-Signature: aezkiy9nbk7oxumcb9bk9t3wibmuzhcg X-HE-Tag: 1698081749-361594 X-HE-Meta: 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 Vv5Mrh7G 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 23.10.23 19:08, Catalin Marinas wrote: > On Mon, Oct 23, 2023 at 01:55:12PM +0200, David Hildenbrand wrote: >> On 23.10.23 12:50, Catalin Marinas wrote: >>> On Mon, Oct 23, 2023 at 04:16:56PM +0900, Hyesoo Yu wrote: >>>> Does tag storage itself supports tagging? Will the following version be unusable >>>> if the hardware does not support it? The document of google said that >>>> "If this memory is itself mapped as Tagged Normal (which should not happen!) >>>> then tag updates on it either raise a fault or do nothing, but never change the >>>> contents of any other page." >>>> (https://github.com/google/sanitizers/blob/master/mte-dynamic-carveout/spec.md) >>>> >>>> The support of H/W is very welcome because it is good to make the patches simpler. >>>> But if H/W doesn't support it, Can't the new solution be used? >>> >>> AFAIK on the current interconnects this is supported but the offsets >>> will need to be configured by firmware in such a way that a tag access >>> to the tag carve-out range still points to physical RAM, otherwise, as >>> per Google's doc, you can get some unexpected behaviour. > [...] >> I followed what you are saying, but I didn't quite read the following >> clearly stated in your calculations: Using this model, how much memory would >> you be able to reuse, and how much not? >> >> I suspect you would *not* be able to reuse "1/(32*32)" [second carve-out] >> but be able to reuse "1/32 - 1/(32*32)" [first carve-out] or am I completely >> off? > > That's correct. In theory, from the hardware perspective, we could even > go recursively to the third/fourth etc. carveout until the last one is a > single page but I'd rather not complicate things further. > >> Further, (just thinking about it) I assume you've taken care of the >> condition that memory cannot self-host it's own tag memory. So that cannot >> happen in the model proposed here, right? > > I don't fully understand what you mean. The tags for the first data > range (0 .. ram_size * 31/32) are stored in the first tag carveout. > That's where we'll need CMA. For the tag carveout, when hosting data > pages as tagged, the tags go in the second carveout which is fully > reserved (still TBD but possibly the firmware won't even tell the kernel > about it). You got my cryptic question right: you make sure that the tag for the first carveout go to the second carveout. Sounds very good, thanks. -- Cheers, David / dhildenb