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 48D40C87FCB for ; Wed, 6 Aug 2025 08:51:45 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id E14766B009B; Wed, 6 Aug 2025 04:51:44 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id DEBD16B00CC; Wed, 6 Aug 2025 04:51:44 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id C8C8C6B00CD; Wed, 6 Aug 2025 04:51:44 -0400 (EDT) X-Delivered-To: linux-mm@kvack.org Received: from relay.hostedemail.com (smtprelay0016.hostedemail.com [216.40.44.16]) by kanga.kvack.org (Postfix) with ESMTP id B91EC6B009B for ; Wed, 6 Aug 2025 04:51:44 -0400 (EDT) Received: from smtpin27.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay07.hostedemail.com (Postfix) with ESMTP id 61B61160486 for ; Wed, 6 Aug 2025 08:51:44 +0000 (UTC) X-FDA: 83745714528.27.B2FBE02 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.129.124]) by imf14.hostedemail.com (Postfix) with ESMTP id 044B2100005 for ; Wed, 6 Aug 2025 08:51:41 +0000 (UTC) Authentication-Results: imf14.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=CcLPAqSF; spf=pass (imf14.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 as permitted sender) smtp.mailfrom=david@redhat.com; dmarc=pass (policy=quarantine) header.from=redhat.com ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1754470302; a=rsa-sha256; cv=none; b=lprxX+KRk0QZaWqojvYwQ1jaUexDpAPfW3KPVssSH3llJcbC6+fXTQp3ZDEKnWe1bexqqj 9nKE9krLfb3gCNBLZ5cdFWR9fY0PteReGbs9ANuIjzem0wAR2qDJXYBQ1Xsqy0fnG7N36V THfnhl6MbzKFcADrnoWzh1jPRRUP69s= ARC-Authentication-Results: i=1; imf14.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=CcLPAqSF; spf=pass (imf14.hostedemail.com: domain of david@redhat.com designates 170.10.129.124 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=1754470302; 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=4IwNT9i/JwzyfF0WXSmv6SUio7A4Qs+8y1jGBSlhhlE=; b=FGILm+ArOJkC6bG4yyTiseivdlbOyu30NeIKKpipRlUiYYB/W6AznNFa73jUg2BXTO15fr DzmnMecZxxmsiAiqH+mZo4mE6PqYt1NLzZ/tlzw+Q9JJ8qSpJ5pIy2KrJeSLh4SbdBwreM 3Bte1Kwj5COhMTYXSQgjiHBFZlSreQU= DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1754470301; 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=4IwNT9i/JwzyfF0WXSmv6SUio7A4Qs+8y1jGBSlhhlE=; b=CcLPAqSF7iEIOlz8OVW41Ae7xqfqT4++tR+F+Q7FdYEHqKwRBT4PlrvXt/uGqHmhr6NbOb UC4+01somXkWfPGSxwyt4CLlLx4oElYelkS2NBoMUkXtZZdbpO/rhvExGsVzvXa1IX898y L9jcCKado2Wc/aE+wBmrijb7GLksGdo= Received: from mail-wr1-f69.google.com (mail-wr1-f69.google.com [209.85.221.69]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.3, cipher=TLS_AES_256_GCM_SHA384) id us-mta-659-CC3saqqvOeWuSn4ZOkwXvw-1; Wed, 06 Aug 2025 04:51:40 -0400 X-MC-Unique: CC3saqqvOeWuSn4ZOkwXvw-1 X-Mimecast-MFC-AGG-ID: CC3saqqvOeWuSn4ZOkwXvw_1754470299 Received: by mail-wr1-f69.google.com with SMTP id ffacd0b85a97d-3b836f17b50so2789147f8f.1 for ; Wed, 06 Aug 2025 01:51:40 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1754470299; x=1755075099; h=content-transfer-encoding:in-reply-to:organization: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=4IwNT9i/JwzyfF0WXSmv6SUio7A4Qs+8y1jGBSlhhlE=; b=ZGk+a9ZPgQ5VoI++MowqMyB7k4+UL/nMZ5rb4I6cl4pwo8tem5lnwyUXOTYxP7/SSI qkG/aks3bVZGom+9DTCXWURhi9j4T5obQCuglakRyig45unczhB2qaOiobZCdWiz2L5f R6zBzvECcDpGA4vvjsu0881LkUTVhII4KyqDsXLJX5NAKRAVMH4E59KKzlHREvZYmV5D 62ws25ySD/gZDk14D+5iA0Cr4OtoWPpBCXXhrzj+qlTFKVczV7zqUgT4PFJirsLYc9xt Lxxo9ylW1rStIwXlPLiM908SbrNWBgkEqS1V9nmOBLzZ8/FfrYWWYEKYIL9N9NinpE4E NB6g== X-Gm-Message-State: AOJu0YwieAsyFVzKxPrzl+DYb6vryKLY3InZZyRJIvRMKk9IWfqCGfdd As+pgjRKnIRF63Z4LbUnFIYFMOB+EVgXI81o4TB47hLiAJqaxFtDKqixZyql6W+baqm70G59nRr sjDQKET3eeXoRQlXx3/NEtK7Lg8F22P2/Yu5NWxN4pMY7Szub18yb X-Gm-Gg: ASbGncv7iE4bWVCuixWzJhogYG78oKvVNWsWltrXDIanz+K2AJ8QTSlPcwYWMnisluG Sbe1i4wdrnF4dVpdlqnw7hyZ+25PC2I+mnpR0HRfyVwBzxxn3D0ic4lovAPSL0nWZ8J0rjbvK0j 2NxsXaSO/97fJdmYlU0gbJ7Rd14Dt8A/Ud/9hNirpJUOYFpaK/VLo1Kx7WyI1UABtPUXDM6l4tp mKX56kMOa8rG4sKKNkOjKACRhN6r01ee0ZxdUZ6SFdttJkaefJRQo/NyV9XL/2eh9CA5Sr5Xx30 Pq/rq44xq0uU/NzTAvKSvm3N0iSkczePq7B7c9kT4/O7tdpHT1DgzUMv1HMxVwHs3zx/03daQ2e fyRdeo292NMlyUCk38oFLJBU/W8m/h+Hkg/XQ2GCleUbecu0Uhcxgym6P2TwhrgBxWYQ= X-Received: by 2002:a05:6000:3107:b0:3b8:eb7d:f82a with SMTP id ffacd0b85a97d-3b8f415f242mr1693298f8f.3.1754470299002; Wed, 06 Aug 2025 01:51:39 -0700 (PDT) X-Google-Smtp-Source: AGHT+IHs0sLPv6yMKhOQrjuK82i6lu18QLMsncnzFBpwyUyzNv9fFv8kUEdIpX9vcp/OMB7hxfeeNQ== X-Received: by 2002:a05:6000:3107:b0:3b8:eb7d:f82a with SMTP id ffacd0b85a97d-3b8f415f242mr1693267f8f.3.1754470298533; Wed, 06 Aug 2025 01:51:38 -0700 (PDT) Received: from ?IPV6:2003:d8:2f35:8a00:42f7:2657:34cc:a51f? (p200300d82f358a0042f7265734cca51f.dip0.t-ipconnect.de. [2003:d8:2f35:8a00:42f7:2657:34cc:a51f]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-458953eaeeesm305390535e9.25.2025.08.06.01.51.37 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 06 Aug 2025 01:51:37 -0700 (PDT) Message-ID: <9ec621c0-ab26-442e-a07d-06905699fbc6@redhat.com> Date: Wed, 6 Aug 2025 10:51:37 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: Default value of CMA_SYSFS To: Jean Delvare , Minchan Kim , Anshuman Khandual , Frank van der Linden Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org, Minchan Kim References: <20250806100748.21620372@endymion> 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/g1oFAmgsLPQFCRvGjuMACgkQTd4Q 9wD/g1o0bxAAqYC7gTyGj5rZwvy1VesF6YoQncH0yI79lvXUYOX+Nngko4v4dTlOQvrd/vhb 02e9FtpA1CxgwdgIPFKIuXvdSyXAp0xXuIuRPQYbgNriQFkaBlHe9mSf8O09J3SCVa/5ezKM OLW/OONSV/Fr2VI1wxAYj3/Rb+U6rpzqIQ3Uh/5Rjmla6pTl7Z9/o1zKlVOX1SxVGSrlXhqt kwdbjdj/csSzoAbUF/duDuhyEl11/xStm/lBMzVuf3ZhV5SSgLAflLBo4l6mR5RolpPv5wad GpYS/hm7HsmEA0PBAPNb5DvZQ7vNaX23FlgylSXyv72UVsObHsu6pT4sfoxvJ5nJxvzGi69U s1uryvlAfS6E+D5ULrV35taTwSpcBAh0/RqRbV0mTc57vvAoXofBDcs3Z30IReFS34QSpjvl Hxbe7itHGuuhEVM1qmq2U72ezOQ7MzADbwCtn+yGeISQqeFn9QMAZVAkXsc9Wp0SW/WQKb76 FkSRalBZcc2vXM0VqhFVzTb6iNqYXqVKyuPKwhBunhTt6XnIfhpRgqveCPNIasSX05VQR6/a OBHZX3seTikp7A1z9iZIsdtJxB88dGkpeMj6qJ5RLzUsPUVPodEcz1B5aTEbYK6428H8MeLq NFPwmknOlDzQNC6RND8Ez7YEhzqvw7263MojcmmPcLelYbfOwU0EVcufkQEQAOfX3n0g0fZz 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+DWgUCaCwtJQUJG8aPFAAKCRBN3hD3AP+DWlDnD/4k2TW+HyOOOePVm23F5HOhNNd7nNv3 Vq2cLcW1DteHUdxMO0X+zqrKDHI5hgnE/E2QH9jyV8mB8l/ndElobciaJcbl1cM43vVzPIWn 01vW62oxUNtEvzLLxGLPTrnMxWdZgxr7ACCWKUnMGE2E8eca0cT2pnIJoQRz242xqe/nYxBB /BAK+dsxHIfcQzl88G83oaO7vb7s/cWMYRKOg+WIgp0MJ8DO2IU5JmUtyJB+V3YzzM4cMic3 bNn8nHjTWw/9+QQ5vg3TXHZ5XMu9mtfw2La3bHJ6AybL0DvEkdGxk6YHqJVEukciLMWDWqQQ RtbBhqcprgUxipNvdn9KwNpGciM+hNtM9kf9gt0fjv79l/FiSw6KbCPX9b636GzgNy0Ev2UV m00EtcpRXXMlEpbP4V947ufWVK2Mz7RFUfU4+ETDd1scMQDHzrXItryHLZWhopPI4Z+ps0rB CQHfSpl+wG4XbJJu1D8/Ww3FsO42TMFrNr2/cmqwuUZ0a0uxrpkNYrsGjkEu7a+9MheyTzcm vyU2knz5/stkTN2LKz5REqOe24oRnypjpAfaoxRYXs+F8wml519InWlwCra49IUSxD1hXPxO WBe5lqcozu9LpNDH/brVSzHCSb7vjNGvvSVESDuoiHK8gNlf0v+epy5WYd7CGAgODPvDShGN g3eXuA== Organization: Red Hat In-Reply-To: <20250806100748.21620372@endymion> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: 3qqciB9m1T4in5sWcCAPEJI5nTDQxj3lkLPQA8w-RyY_1754470299 X-Mimecast-Originator: redhat.com Content-Language: en-US Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 044B2100005 X-Stat-Signature: mhfr3z3m1cehs9yqh9b4hgcg54xbzscf X-HE-Tag: 1754470301-133883 X-HE-Meta: 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 78Lvd2vI 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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 06.08.25 10:07, Jean Delvare wrote: > Hi all, Hi! > > CMA_SYSFS looks like a generally useful and low footprint option. Is > there any reason why it isn't enabled by default when its dependencies > are met? Looking at the introducing commit commit 43ca106fa8ec7d684776fbe561214d3b2b7cb9cb Author: Minchan Kim Date: Tue May 4 18:37:28 2021 -0700 mm: cma: support sysfs Since CMA is getting used more widely, it's more important to keep monitoring CMA statistics for system health since it's directly related to user experience. This patch introduces sysfs statistics for CMA, in order to provide some basic monitoring of the CMA allocator. * the number of CMA page successful allocations * the number of CMA page allocation failures These two values allow the user to calcuate the allocation failure rate for each CMA area. I cannot really tell why we made this configurable. > > I was wondering if it would make sense to add "default y" to this > option. What do you think? I'm wondering if we should remove the option completely -- or turn it into an internal option only such that it's no longer user-selectable. CCing Minchan Kim -- Cheers, David / dhildenb