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 B83AFCAC598 for ; Wed, 17 Sep 2025 10:58:47 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 09C898E000C; Wed, 17 Sep 2025 06:58:47 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 04B168E0001; Wed, 17 Sep 2025 06:58:46 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id E55608E000C; Wed, 17 Sep 2025 06:58:46 -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 CE0688E0001 for ; Wed, 17 Sep 2025 06:58:46 -0400 (EDT) Received: from smtpin04.hostedemail.com (a10.router.float.18 [10.200.18.1]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 4AE2186CE6 for ; Wed, 17 Sep 2025 10:58:46 +0000 (UTC) X-FDA: 83898444252.04.1B3C0F0 Received: from us-smtp-delivery-124.mimecast.com (us-smtp-delivery-124.mimecast.com [170.10.133.124]) by imf02.hostedemail.com (Postfix) with ESMTP id C634C80006 for ; Wed, 17 Sep 2025 10:58:43 +0000 (UTC) Authentication-Results: imf02.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=PSMAaLYD; spf=pass (imf02.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=1758106724; 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=7JkjtbRP7dMtBFUCBqCV1SQcXuhyJiXUoZv2gn/Tp1M=; b=UikNLX2U8tiaLSDHr6wnmt1nNKRqaxJn8b8FJJZ1d5oPrbFiljVa4mWCCtcNwbM0scU2J4 ItkJnhfKrYEZWIKmTAYzF38FVn8bShrw3tusDiTfPn3OgVM7fE7n5WQsxM/Uqvuz8PVI3R ZBlb5OPAW4uuV4Fk8Jn6iGsI9kKcAkI= ARC-Seal: i=1; s=arc-20220608; d=hostedemail.com; t=1758106724; a=rsa-sha256; cv=none; b=cjfRCsdxDtL9um14+Y1KaC2o8Bvht4JlzDItt+pEwVbMShuxd/z+pSjeXpviS7vlWWccRW dyQcijkfVaddEPj0CCMzJhPECa4fVvTRQcbW7L9Y372Ww1DzkA0AckfdA3brs1IR1dtfLW 2pVBEw/oUOjQHhmPxpqmAHU15nlwLbE= ARC-Authentication-Results: i=1; imf02.hostedemail.com; dkim=pass header.d=redhat.com header.s=mimecast20190719 header.b=PSMAaLYD; spf=pass (imf02.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=1758106723; 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=7JkjtbRP7dMtBFUCBqCV1SQcXuhyJiXUoZv2gn/Tp1M=; b=PSMAaLYDrU2UF5XnsESWllYqAvAlPdgzq/XNgWhgNviPnoV4RA1zfQrtNaqOzWhV1xAhKJ EmyCq3X4fSVgkqNK21c3kKpAmaGf/wMI8Yhz1CayfQ4xQLDFxEZeLCoRpJSQX03X7KQbhO 28VnishYXebFtBRJu1S53M18PW7n9jY= 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-468-qQ1Tx0maM261mNREIQiUSg-1; Wed, 17 Sep 2025 06:58:39 -0400 X-MC-Unique: qQ1Tx0maM261mNREIQiUSg-1 X-Mimecast-MFC-AGG-ID: qQ1Tx0maM261mNREIQiUSg_1758106719 Received: by mail-wm1-f69.google.com with SMTP id 5b1f17b1804b1-45b990eb77cso6392275e9.0 for ; Wed, 17 Sep 2025 03:58:39 -0700 (PDT) X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1758106719; x=1758711519; 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=7JkjtbRP7dMtBFUCBqCV1SQcXuhyJiXUoZv2gn/Tp1M=; b=VL96T592KcHEWaluv7XVFOQdHQeTrzgbw0mCPvr7y1/C2IPlbLWN95eGVM1IMGhO/k +CoLh3RyZn//w+kI0Q+rTjQdCji0SLbrJYk9w9AGRC07aQUWQHKZvp4ohAWh0LoqUa6z PhwAQJZZQmeGKEf8I7OPmNZcTS/gj8P623d61egpu0rBFORXL5zM/r9zr7dr40caEUFw fHijQuDYzCSpQQxmjF3v8XsaiRK6wQ70Xa159jTJTrF4CN6PQcXrIqU6g6VmTETeBc16 PDi4+y04peOFQEBFqLwWBgZZTMryGp/qftaVZGYKKibZ/H+08gcvfB0u2G/9waRxErLK P07g== X-Forwarded-Encrypted: i=1; AJvYcCV9Q0NZQ/OmlVzCM+hho4n9HDNxYLo5dyHsPHTu6V7rnx/gV5ow2qU9lSZagtE7fxcM0ii7fJwPPg==@kvack.org X-Gm-Message-State: AOJu0Yxjv8nt6FmiqxCJ7fCuPojH6wtQGL8RpoZI2BKHgo8fMq7erONF 4kMbTjucU3Zh6J6e87LQEy1DXb9zzUmVdKur/f16F2W30XX4QGZdN7rvma9xZbjNXZ7KE4pmGX5 B9vLE8TWmJ51dbf78cxxmnEKGtsY9Tmi/zSRSusrVM87jw0Gdi2H9 X-Gm-Gg: ASbGnctq7thyw/UO7rDI8sXABE5d37uSj8UQS1XI0jKJEKnn7ZZWgcASyOpd3JmviFx Dx+q2a+D3gPswdsTrnEerafbpxG/zTE/T8qBKW7hy6ZfYYr9InxaxYo4sZBYhkwuuw2QBcGaHB9 m2cbtQSAeXzxTXqz9Hz+HQieUSczqHs2g4Oy9dR1aZ/ovwfF/yt5OJM51pF9++9qcpoa0mda9z+ REnQ3oYZ1UVchvWX26Q3BsO+ND8vAR0fZ1ShX+AYFc7s1S7DkO5P69KTHAkmVS9Z7lun+2BcKt1 /tns472WLRNLpukQw3mOD9+R16vSBf3QiElbVbdDR3E6Mo7WsoReHcVH6HVVsheN82IjJ4mHvsl meMsxNVPX8xRZZh+gJqm+XE5z1PJmiAWkhr7WGZwz2gYj4lyt6uJwwpIdOMjaPCbe X-Received: by 2002:a05:600c:608b:b0:45d:e775:d8b8 with SMTP id 5b1f17b1804b1-45f32d002bamr64516635e9.1.1758106718658; Wed, 17 Sep 2025 03:58:38 -0700 (PDT) X-Google-Smtp-Source: AGHT+IGYHfjJCnarL426rUzCpUmPlFf0QrjHqktYk5gtQG/LD4ICoTbUxGn3yS+4cVVuXKN0QVM+1w== X-Received: by 2002:a05:600c:608b:b0:45d:e775:d8b8 with SMTP id 5b1f17b1804b1-45f32d002bamr64516205e9.1.1758106718247; Wed, 17 Sep 2025 03:58:38 -0700 (PDT) Received: from ?IPV6:2003:d8:2f27:6d00:7b96:afc9:83d0:5bd? (p200300d82f276d007b96afc983d005bd.dip0.t-ipconnect.de. [2003:d8:2f27:6d00:7b96:afc9:83d0:5bd]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3ece199ad24sm745170f8f.50.2025.09.17.03.58.35 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Wed, 17 Sep 2025 03:58:37 -0700 (PDT) Message-ID: <1308de0e-bb5a-481f-a447-ee4440ffb419@redhat.com> Date: Wed, 17 Sep 2025 12:58:35 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/7] mm/selftests: add max_vma_count tests To: Kalesh Singh , akpm@linux-foundation.org, minchan@kernel.org, lorenzo.stoakes@oracle.com, Liam.Howlett@oracle.com, rppt@kernel.org, pfalcato@suse.de Cc: kernel-team@android.com, android-mm@google.com, Alexander Viro , Christian Brauner , Jan Kara , Kees Cook , Vlastimil Babka , Suren Baghdasaryan , Michal Hocko , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Ben Segall , Mel Gorman , Valentin Schneider , Jann Horn , Shuah Khan , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org References: <20250915163838.631445-1-kaleshsingh@google.com> <20250915163838.631445-3-kaleshsingh@google.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 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: <20250915163838.631445-3-kaleshsingh@google.com> X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: mXf5E2t9XUNXMnNAS60alywKHNJ5RFFFl9sy6sEhaHk_1758106719 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: C634C80006 X-Stat-Signature: s9owhtwgndsx6yhruysd5wktyxgoxegi X-Rspam-User: X-Rspamd-Server: rspam09 X-HE-Tag: 1758106723-893842 X-HE-Meta: U2FsdGVkX1+g+hiIlh+oZfxxn+yXqpsMH0paWZmXe7rVMzeNWyn3hGZTR7pnyf2aPkO+E1ZbLRWeQ0KLtZrN/izr0D+WoyhNwDYHHq4rFaStjVY8DYj+qcu1a07D1OGAzccpHU077bi00s3g+fB9HCICiUJuV1uOTsrghOYAf95AlyjBlYSdAZfmtZXMtHX3CjwenQhyz6dOfoQOaBCVNEqwa6vT1BVZp+oIwNN+d4vssBcbjpwQd/etnb3UALwgLwlmm6UntmBEdaIIxypiVHG+h5VGoNBJ7YFJYrZHUNQPmpf45313MMGt39PLba6PnaQT8jlGJozzsNfpeWHa/c304mXeh7kZohFQc/Zj7EzYrUJ59K1TUK16/iku7IutUwcGBlUt+IagXcKY5iR9NzpXucRS+Ig7sTi876lrvOnRGJdmpzqcITsjON5lnxf4SshFSM00d7Bv5uD4BvmfWoBdK00yYcqc3DpqKfUUMfmXupvKugWTkLTw0RpbAt5GGmGy24nmgPK5lXNGIGiTNTOyarLz0QtuRKQkMiqoeWRcUAI/OkVyW7BPqVXFtJDNRbY3tgVayXlT4wzuPyOfcTZsM1hof+2xm3j8Ya7ZboXyUlzcVMY6SXzEYBRKqwDWkbC/bi/Jw6EKjX0+nzB+P8Gt/7Ily/xYH4Hapss/RHwALcrzLjhRmGw5z5/laJsYipkvmjzSvY+ONm4rvyYE5pXKNWifmz26qXtCEnzWwFsplMPGiK1nngYf2UiaIMYEwnGBffYe6+dS0ybYAwwq6SngjjmNn3G/cC9KSeQ/s9tu1QQyeULBfy7wWNVuLUYYVkiYA9/fmdM6njM14dYyPjCjlUOMvQmlxvSa7YfX0UyeRjd2kQh+jy9TN+7uLAFIEVMKKMAGR67pp7lwB3k6ES5V+a0B1TXOfePjLHo1tb5DT5TFgOkQswvl2S5Pp6woqAz8piu1jalnt9IdVyu KjReHUIr InKwDqAMFWl0ztngDBFTa2ioyhgwD9E4lNB1yFWVq3upgIJg97uitZ+5p8ncEV4Q2V0O5EtvWcGVjr2oklfhID016gKHAJn/iUCzNlaWeRcY1HpTZDhRguAXLZAvBJJtkr2SFQjphqHTLjZln/S53sNUo4T58enVz2jlllzNyheblWBZRNOB/uOPvG7OgccsKuNqAN4yW2e0HE2AIBLp6m8ZffCUcgmG/0BVpWbyu9SdoPizWTN/0sjVoBtj7djvsv8ybQ5M0D4pEBxic+o2OqUvix1u6C7zsyyEVpFLLK5eqdY8XSnPcREOEKaMpM/igdcDZo8jRnsTqKXtyEq8YlR59rIAbeD0pdoXABPkTexV3OnjDFJXaWpx8TTJjpYIrSMks/ukIhAXHe9ZAC2QG/lTuIzXHzdj2LcQgLZziPvTC+O2Essp8HR5FEjjLGsBqZD5GcXvIId+HLa3HWV1GQwsBbAEQyd/QJT6O 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: > + * test_suite_setup - Set up the VMA layout for VMA count testing. > + * > + * Sets up the following VMA layout: > + * > + * +----- base_addr > + * | > + * V > + * +--------------+----------------------+--------------+----------------+--------------+----------------+--------------+-----+----------------+--------------+ > + * | Guard Page | | Guard Page | Extra Map 1 | Unmapped Gap | Extra Map 2 | Unmapped Gap | ... | Extra Map N | Unmapped Gap | > + * | (unmapped) | TEST_AREA | (unmapped) | (mapped page) | (1 page) | (mapped page) | (1 page) | ... | (mapped page) | (1 page) | > + * | (1 page) | (unmapped, 3 pages) | (1 page) | (1 page) | | (1 page) | | | (1 page) | | > + * +--------------+----------------------+--------------+----------------+--------------+----------------+--------------+-----+----------------+--------------+ > + * ^ ^ ^ ^ ^ > + * | | | | | > + * +--GUARD_SIZE--+ | +-- EXTRA_MAPS points here Sufficient EXTRA_MAPS to ---+ > + * (PAGE_SIZE) | | reach MAX_VMA_COUNT > + * | | > + * +--- TEST_AREA_SIZE ---+ > + * | (3 * PAGE_SIZE) | > + * ^ > + * | > + * +-- TEST_AREA starts here > + * > Just wondering if we could find a different name than "guard page" here, to not confuse stuff with guard ptes Will the current "guard page" we a valid vma or just a hole? -- Cheers David / dhildenb