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]) (using TLSv1 with cipher DHE-RSA-AES256-SHA (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 11B1ACA0FF0 for ; Mon, 1 Sep 2025 12:25:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 55ECA8E002A; Mon, 1 Sep 2025 08:25:25 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 536BF8E0013; Mon, 1 Sep 2025 08:25:25 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 424E58E002A; Mon, 1 Sep 2025 08:25:25 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0013.hostedemail.com [216.40.44.13]) by kanga.kvack.org (Postfix) with ESMTP id 3119F8E0013 for ; Mon, 1 Sep 2025 08:25:25 -0400 (EDT) Received: from smtpin29.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id B6B0E160823 for ; Mon, 1 Sep 2025 12:25:24 +0000 (UTC) X-FDA: 83840601768.29.DDEAA8C Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf21.hostedemail.com (Postfix) with ESMTP id 5A58C1C0004 for ; Mon, 1 Sep 2025 12:25:22 +0000 (UTC) Authentication-Results: imf21.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="Xkb/L480"; spf=pass (imf21.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1756729522; 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=Ry3HTsvjDYn6ZhWkEuXZ7HIdFuNl7/b7zLeVSRNzby4=; b=4h7i2IrI0TGVJ6mtFX4/acbN9VeEti5i6PInLxIsvxg5zSufQympnAPgdzJl2MxLZwXAgI S9fU11fsxnc2U89u5j68Ph4+SmspPjRQ4MTJOFy3l5QmUtscTJzo8xfP0WARQCt/Fp4bzD 0eXsttfcYckP4pIwnIyoz1xvFbEul0s= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1756729522; a=rsa-sha256; cv=none; b=hYJEt1Z19GDhriv1sTvHWuZW8oz6ggH+wr8m0iu/qRJidRvClxUKa65lEukvRo9A0IigWb +Ww6SdO88Ea02klxrEa2I3eXQukrf/ujhNjnYc/Db41YgJWBZxvJiHGXCC78FiHwv1CUJY 2OoVe+blabhqWKC6WtEWuv90tglc/kc= ARC-Authentication-Results: i=1; imf21.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b="Xkb/L480"; spf=pass (imf21.hostedemail.com: domain of david@redhat.com designates 170.10.133.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1756729521; 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=Ry3HTsvjDYn6ZhWkEuXZ7HIdFuNl7/b7zLeVSRNzby4=; b=Xkb/L480w/F0gcNyYwSFxayB5yRR/0q67Vi+fqEe/ob85rBgCZsGO1X5XsGCetpPsCDoma 7m01I1cmeCyee1RFkC0qejO+K8yB1wVbKd3mR+hZWqjDhN5J4aa17VkDiAEGrGTDTeoskw jQMspH/SDTCuxU87+5tLDkrQftddPxs= Received: from mail-wm1-f69.google.com (mail-wm1-f69.google.com [209.85.128.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-444-nzDPECsrPiK3yzYOvKPwGg-1; Mon, 01 Sep 2025 08:25:18 -0400 X-MC-Unique: nzDPECsrPiK3yzYOvKPwGg-1 X-Mimecast-MFC-AGG-ID: nzDPECsrPiK3yzYOvKPwGg_1756729517 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-45b83ae1717so21033655e9.0 for ; Mon, 01 Sep 2025 05:25:18 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1756729517; x=1757334317; h=content-transfer-encoding:in-reply-to:autocrypt:content-language :from:references:cc:to:subject:user-agent:mime-version:date :message-id:x-gm-message-state:from:to:cc:subject:date:message-id :reply-to; bh=Ry3HTsvjDYn6ZhWkEuXZ7HIdFuNl7/b7zLeVSRNzby4=; b=YC0toz/dEjMyzjbuFFopGGPkLKJQLVZjyfCPSs1sawhiO16k6e3Hg93IjyWuJMJ4rq 56IGxZvlL8085f9+hizhksdvy8MVns7sm/jaSEpjis4CappX+J75kDKmE64MxnJ3lwyz 7Z717+wUdmJrnlofB1yGI+logj/rXRij1/nq/bMaLtXpZhVqnGYWACfaZZ2VEl2enIFv qc9saKMNzwqu4k3wpTTIVoU6BL8+ZzyDzn1pa3w5Um5A2lkGxxtgHq1pH7QOgQk8xU2t kbbUfYtc8SEBRzKyPnxB/nRYaP7moGMI8bw19Rc76XjLz8xWOYHwIG2j9muyo8i8PXDR LvcA== X-Forwarded-Encrypted: i=1; AJvYcCWmF4Dew6mrrlPh3AwLc0XmLFw2z9TTmEFZs1WObJCeSTBLdECjFUDBO+kRNnq55OrkCY7Rkze4mw==@kvack.org X-Gm-Message-State: AOJu0YyMW3/uQR1q2IVBBUGvI7bXCMMkgeEicYkrKGxWMPxIt2xiNYb/ AsNSg1/0oubTzlmdmce3LitwBcDn3NRuQKUrH1zTHAvSkDDRtbpObSC6fs49oOCTBe2zScOS/sL oK8zboOkg9nHPZfCWarV64e791jzCGMH4xsXM+o61FIHprvaF2hqw X-Gm-Gg: ASbGnct6MbzMFcL/WhJclEEsh893OKEnjn5Rup4e/KO5DZwaBbyY7EZSOZknYyoQXZD BtdQWhNl30noi7dLL7IW/BxXNxpjUdP4ftPbDDqXfjgKuphskV9l1qDVr596uZFTjbuHAv4YaRk 5ePAqSjSHYm6+81OnYzy8PV7tQmJ2+/k9499dVn1VMEuMLAD+f7UY0WkFJoCHO0YPrFeRVRZQCU X8XQk8T8g6tjCmy2OnlNBG/s/zsmfyrhkZAesPo8Bm2SCedZLAFdZknv7gExSZGVsKvpSkAcqRl gRu3PqI/bsH6TV45ECHkncanjUcvV7BRYT4SL56QcTGZJtk1ujJSa3e+/UDaRuRCPw57v97AZvf qV3lCARtVnOCEFBECGFlrsDAlClyiODQ3ZrMmjTVH7ZUfjfm0GehluIrBw55rFyFvVe8= X-Received: by 2002:a05:600c:1e89:b0:45b:88ed:9558 with SMTP id 5b1f17b1804b1-45b88ed9bc3mr51982145e9.30.1756729517125; Mon, 01 Sep 2025 05:25:17 -0700 (PDT) X-Google-Smtp-Source: AGHT+IEMGDtOgsZk0c5UDFaUJZJgP3BXCuLTMzz4/00ieMVST2ui2ccALyIM8NlgAkQyyG7Klnzysg== X-Received: by 2002:a05:600c:1e89:b0:45b:88ed:9558 with SMTP id 5b1f17b1804b1-45b88ed9bc3mr51981875e9.30.1756729516581; Mon, 01 Sep 2025 05:25:16 -0700 (PDT) Received: from ?IPV6:2003:d8:2f37:2b00:948c:dd9f:29c8:73f4? (p200300d82f372b00948cdd9f29c873f4.dip0.t-ipconnect.de. [2003:d8:2f37:2b00:948c:dd9f:29c8:73f4]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45b6f0c6dc1sm237238175e9.1.2025.09.01.05.25.14 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Mon, 01 Sep 2025 05:25:15 -0700 (PDT) Message-ID: Date: Mon, 1 Sep 2025 14:25:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [RFC 0/3] cgroups: Add support for pinned device memory To: Maarten Lankhorst , Lucas De Marchi , =?UTF-8?Q?=27Thomas_Hellstr=C3=B6m=27?= , Rodrigo Vivi , David Airlie , Simona Vetter , Maxime Ripard , Natalie Vock , Tejun Heo , Johannes Weiner , =?UTF-8?Q?=27Michal_Koutn=C3=BD=27?= , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Lorenzo Stoakes , "'Liam R . Howlett'" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Thomas Zimmermann Cc: Michal Hocko , intel-xe@lists.freedesktop.org, dri-devel@lists.freedesktop.org, linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org References: <20250819114932.597600-5-dev@lankhorst.se> 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 ZW5icmFuZCA8ZGF2aWRAcmVkaGF0LmNvbT7CwZoEEwEIAEQCGwMCF4ACGQEFCwkIBwICIgIG FQoJCAsCBBYCAwECHgcWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaJzangUJJlgIpAAKCRBN 3hD3AP+DWhAxD/9wcL0A+2rtaAmutaKTfxhTP0b4AAp1r/eLxjrbfbCCmh4pqzBhmSX/4z11 opn2KqcOsueRF1t2ENLOWzQu3Roiny2HOU7DajqB4dm1BVMaXQya5ae2ghzlJN9SIoopTWlR 0Af3hPj5E2PYvQhlcqeoehKlBo9rROJv/rjmr2x0yOM8qeTroH/ZzNlCtJ56AsE6Tvl+r7cW 3x7/Jq5WvWeudKrhFh7/yQ7eRvHCjd9bBrZTlgAfiHmX9AnCCPRPpNGNedV9Yty2Jnxhfmbv Pw37LA/jef8zlCDyUh2KCU1xVEOWqg15o1RtTyGV1nXV2O/mfuQJud5vIgzBvHhypc3p6VZJ lEf8YmT+Ol5P7SfCs5/uGdWUYQEMqOlg6w9R4Pe8d+mk8KGvfE9/zTwGg0nRgKqlQXrWRERv cuEwQbridlPAoQHrFWtwpgYMXx2TaZ3sihcIPo9uU5eBs0rf4mOERY75SK+Ekayv2ucTfjxr Kf014py2aoRJHuvy85ee/zIyLmve5hngZTTe3Wg3TInT9UTFzTPhItam6dZ1xqdTGHZYGU0O otRHcwLGt470grdiob6PfVTXoHlBvkWRadMhSuG4RORCDpq89vu5QralFNIf3EysNohoFy2A LYg2/D53xbU/aa4DDzBb5b1Rkg/udO1gZocVQWrDh6I2K3+cCs7BTQRVy5+RARAA59fefSDR 9nMGCb9LbMX+TFAoIQo/wgP5XPyzLYakO+94GrgfZjfhdaxPXMsl2+o8jhp/hlIzG56taNdt VZtPp3ih1AgbR8rHgXw1xwOpuAd5lE1qNd54ndHuADO9a9A0vPimIes78Hi1/yy+ZEEvRkHk /kDa6F3AtTc1m4rbbOk2fiKzzsE9YXweFjQvl9p+AMw6qd/iC4lUk9g0+FQXNdRs+o4o6Qvy iOQJfGQ4UcBuOy1IrkJrd8qq5jet1fcM2j4QvsW8CLDWZS1L7kZ5gT5EycMKxUWb8LuRjxzZ 3QY1aQH2kkzn6acigU3HLtgFyV1gBNV44ehjgvJpRY2cC8VhanTx0dZ9mj1YKIky5N+C0f21 zvntBqcxV0+3p8MrxRRcgEtDZNav+xAoT3G0W4SahAaUTWXpsZoOecwtxi74CyneQNPTDjNg azHmvpdBVEfj7k3p4dmJp5i0U66Onmf6mMFpArvBRSMOKU9DlAzMi4IvhiNWjKVaIE2Se9BY FdKVAJaZq85P2y20ZBd08ILnKcj7XKZkLU5FkoA0udEBvQ0f9QLNyyy3DZMCQWcwRuj1m73D sq8DEFBdZ5eEkj1dCyx+t/ga6x2rHyc8Sl86oK1tvAkwBNsfKou3v+jP/l14a7DGBvrmlYjO 59o3t6inu6H7pt7OL6u6BQj7DoMAEQEAAcLBfAQYAQgAJgIbDBYhBBvZyq1zXEw6Rg38yk3e EPcA/4NaBQJonNqrBQkmWAihAAoJEE3eEPcA/4NaKtMQALAJ8PzprBEXbXcEXwDKQu+P/vts IfUb1UNMfMV76BicGa5NCZnJNQASDP/+bFg6O3gx5NbhHHPeaWz/VxlOmYHokHodOvtL0WCC 8A5PEP8tOk6029Z+J+xUcMrJClNVFpzVvOpb1lCbhjwAV465Hy+NUSbbUiRxdzNQtLtgZzOV Zw7jxUCs4UUZLQTCuBpFgb15bBxYZ/BL9MbzxPxvfUQIPbnzQMcqtpUs21CMK2PdfCh5c4gS sDci6D5/ZIBw94UQWmGpM/O1ilGXde2ZzzGYl64glmccD8e87OnEgKnH3FbnJnT4iJchtSvx yJNi1+t0+qDti4m88+/9IuPqCKb6Stl+s2dnLtJNrjXBGJtsQG/sRpqsJz5x1/2nPJSRMsx9 5YfqbdrJSOFXDzZ8/r82HgQEtUvlSXNaXCa95ez0UkOG7+bDm2b3s0XahBQeLVCH0mw3RAQg r7xDAYKIrAwfHHmMTnBQDPJwVqxJjVNr7yBic4yfzVWGCGNE4DnOW0vcIeoyhy9vnIa3w1uZ 3iyY2Nsd7JxfKu1PRhCGwXzRw5TlfEsoRI7V9A8isUCoqE2Dzh3FvYHVeX4Us+bRL/oqareJ CIFqgYMyvHj7Q06kTKmauOe4Nf0l0qEkIuIzfoLJ3qr5UyXc2hLtWyT9Ir+lYlX9efqh7mOY qIws/H2t In-Reply-To: <20250819114932.597600-5-dev@lankhorst.se> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: RreSc00HlX7VWPS1ENEk4zi1qe0KZlUVVHlYnxjm88w_1756729517 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspamd-Server: rspam10 X-Rspamd-Queue-Id: 5A58C1C0004 X-Stat-Signature: ujxk9bsxu6mkzcggtuyo6uw8ons1mizo X-Rspam-User: X-HE-Tag: 1756729522-165587 X-HE-Meta: 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 EmEZfzVY 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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 19.08.25 13:49, Maarten Lankhorst wrote: > When exporting dma-bufs to other devices, even when it is allowed to use > move_notify in some drivers, performance will degrade severely when > eviction happens. > > A perticular example where this can happen is in a multi-card setup, > where PCI-E peer-to-peer is used to prevent using access to system memory. > > If the buffer is evicted to system memory, not only the evicting GPU wher > the buffer resided is affected, but it will also stall the GPU that is > waiting on the buffer. > > It also makes sense for long running jobs not to be preempted by having > its buffers evicted, so it will make sense to have the ability to pin > from system memory too. > > This is dependant on patches by Dave Airlie, so it's not part of this > series yet. But I'm planning on extending pinning to the memory cgroup > controller in the future to handle this case. > > Implementation details: > > For each cgroup up until the root cgroup, the 'min' limit is checked > against currently effectively pinned value. If the value will go above > 'min', the pinning attempt is rejected. > > Pinned memory is handled slightly different and affects calculating > effective min/low values. Pinned memory is subtracted from both, > and needs to be added afterwards when calculating. The term "pinning" is overloaded, and frequently we refer to pin_user_pages() and friends. So I'm wondering if there is an alternative term to describe what you want to achieve. Is it something like "unevictable" ? -- Cheers David / dhildenb