From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 8976A42CAFA; Mon, 27 Jul 2026 17:52:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785174724; cv=none; b=Vwek+FJh3CrfZNBCTNLQLjLfevkhAmb28xvFU7OTzBsf9shw2wD6WoIyn12R87KWCx4/ZMI/G57HFXKuIptBep/FCO+Z47sBt7d48n3oiCCwPZY5tmOypbUQB2FlZBQZsmZqpevnz2+qqR8DYIZcQUbjpWiMZZbgCr8c5cliF+M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785174724; c=relaxed/simple; bh=QBYGsPIDYzCW8cu26GUfzYqZpwLLiHLM3YAXNp0JVLk=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=SMGOtc4SQFLtHm4rUfqa4QDpNe0x6KSyuIHBdqIt7ChX+2BhsMa4oZwhJdpGPLlAGjc7EqoM8SrsBKojGVvoJid45Wmy4nfIS06v1YGVTezYe72/Wwj84FUKvMeygLq5nFeu1wW9SKqNzc27Ses/C4iPP5kL2xV+Ae3MIygqDj8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=Cc2sRPHT; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="Cc2sRPHT" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1C1A61F000E9; Mon, 27 Jul 2026 17:51:48 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1785174716; bh=wecGDCQXBjfCFMVnfqOxk3k+NVRMuAsFJ4l2NNvx0O8=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=Cc2sRPHTNXRKzGfG9+3lp8wXF5VfmQAbLvCtDFgO7WpDM/Ph4ZVspG7WZSLuTW5mO oIavaX2DUBRi0sOwaqrXIxXVV2FTANcHPH5c4rvBzi/VKXxeGfVzjU9ntMocVoo55z 5osiAAN5sXkqDS4BMwJhl7VoMsjMqkYi2LjG/vyDzNkH5LifcLUsLpbJVf8XUPdwPU 2OYLyDfJC14kGHuyWgWoaLQIDWraUs+CEtPark3lvbUqYjgf/G1yzwuSlNlMDI1LZ4 gBrVYx1l8UpUVimIH0JsbkORqRswgnN2nM4RXGeuCu9HlEJNVdNgJPCeEelfNtbHzT ZcDPebXtqS3fQ== Message-ID: Date: Mon, 27 Jul 2026 19:51:47 +0200 Precedence: bulk X-Mailing-List: linux-kselftest@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 4/5] tools/mm: add a standalone GUP microbenchmark To: Dev Jain , Sarthak Sharma , Andrew Morton Cc: Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Shuah Khan , Jason Gunthorpe , John Hubbard , Peter Xu , Leon Romanovsky , Zi Yan , Baolin Wang , Nico Pache , Ryan Roberts , Barry Song , Lance Yang , Jonathan Corbet , Mark Brown , Anshuman Khandual , linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org References: <20260716123226.197736-1-sarthak.sharma@arm.com> <20260716123226.197736-5-sarthak.sharma@arm.com> <4665dd2d-99c8-492c-a4cf-b72028317d0b@kernel.org> <75259d8f-1cdf-43e4-9fa4-9a2954435a96@arm.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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 B3JfpUqcWwE7vUaYrHG1nw54pLUoPG6sAA7Mehl3nd4pZUALHwARAQABzS5EYXZpZCBIaWxk ZW5icmFuZCAoQ3VycmVudCkgPGRhdmlkQGtlcm5lbC5vcmc+wsGQBBMBCAA6AhsDBQkmWAik AgsJBBUKCQgCFgICHgUCF4AWIQQb2cqtc1xMOkYN/MpN3hD3AP+DWgUCaYJt/AIZAQAKCRBN 3hD3AP+DWriiD/9BLGEKG+N8L2AXhikJg6YmXom9ytRwPqDgpHpVg2xdhopoWdMRXjzOrIKD g4LSnFaKneQD0hZhoArEeamG5tyo32xoRsPwkbpIzL0OKSZ8G6mVbFGpjmyDLQCAxteXCLXz ZI0VbsuJKelYnKcXWOIndOrNRvE5eoOfTt2XfBnAapxMYY2IsV+qaUXlO63GgfIOg8RBaj7x 3NxkI3rV0SHhI4GU9K6jCvGghxeS1QX6L/XI9mfAYaIwGy5B68kF26piAVYv/QZDEVIpo3t7 /fjSpxKT8plJH6rhhR0epy8dWRHk3qT5tk2P85twasdloWtkMZ7FsCJRKWscm1BLpsDn6EQ4 jeMHECiY9kGKKi8dQpv3FRyo2QApZ49NNDbwcR0ZndK0XFo15iH708H5Qja/8TuXCwnPWAcJ DQoNIDFyaxe26Rx3ZwUkRALa3iPcVjE0//TrQ4KnFf+lMBSrS33xDDBfevW9+Dk6IISmDH1R HFq2jpkN+FX/PE8eVhV68B2DsAPZ5rUwyCKUXPTJ/irrCCmAAb5Jpv11S7hUSpqtM/6oVESC 3z/7CzrVtRODzLtNgV4r5EI+wAv/3PgJLlMwgJM90Fb3CB2IgbxhjvmB1WNdvXACVydx55V7 LPPKodSTF29rlnQAf9HLgCphuuSrrPn5VQDaYZl4N/7zc2wcWM7BTQRVy5+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: <75259d8f-1cdf-43e4-9fa4-9a2954435a96@arm.com> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit On 7/24/26 14:05, Dev Jain wrote: > > > On 21/07/26 7:22 pm, David Hildenbrand (Arm) wrote: >> On 7/16/26 14:32, Sarthak Sharma wrote: >>> Add a command-line tool for benchmarking get_user_pages fast-path >>> (GUP_FAST), pin_user_pages fast-path (PIN_FAST), and pin_user_pages >>> longterm (PIN_LONGTERM) via the CONFIG_GUP_TEST debugfs interface. >>> >>> When invoked without arguments, gup_bench runs the benchmark subset >>> of configurations covered by run_gup_matrix() in run_vmtests.sh: all >> >> To we really need the matrix in there? The matrix was good for selftests, but >> not when using it as a benchmarking tool, no? >> >>> three GUP commands across read/write, private/shared mappings, and a >>> range of page counts, with THP on/off for regular mappings and hugetlb >>> for huge page mappings. Restore HugeTLB settings after each hugetlb >>> benchmark run. Validate numeric command-line arguments instead of >>> relying on atoi(). >>> >>> This tool is a mix of reused and new logic. The mapping/setup path comes >>> from selftests/mm/gup_test.c, while the default benchmark matrix matches >>> the benchmark subset of run_gup_matrix() in run_vmtests.sh. The standalone >>> CLI and tools/mm integration are added here and the HugeTLB setup code is >>> shared via tools/lib/mm. >>> >>> Add gup_bench to BUILD_TARGETS and INSTALL_TARGETS in tools/mm/Makefile, >>> link it against the shared tools/lib/mm hugepage helpers, and ignore the >>> resulting binary in tools/mm/.gitignore. While here, also add the >>> missing thp_swap_allocator_test entry to .gitignore. >>> >>> Add tools/mm/gup_bench.c to the GUP entry in MAINTAINERS. >>> >>> Suggested-by: David Hildenbrand (Arm) >>> Signed-off-by: Sarthak Sharma >>> --- >>> MAINTAINERS | 1 + >>> tools/mm/.gitignore | 2 + >>> tools/mm/Makefile | 10 +- >>> tools/mm/gup_bench.c | 482 +++++++++++++++++++++++++++++++++++++++++++ >>> 4 files changed, 492 insertions(+), 3 deletions(-) >>> create mode 100644 tools/mm/gup_bench.c >>> >>> diff --git a/MAINTAINERS b/MAINTAINERS >>> index 26b06d80ab45..7d121dee9f0f 100644 >>> --- a/MAINTAINERS >>> +++ b/MAINTAINERS >>> @@ -17024,6 +17024,7 @@ T: git git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm >>> F: mm/gup.c >>> F: mm/gup_test.c >>> F: mm/gup_test.h >>> +F: tools/mm/gup_bench.c >>> F: tools/testing/selftests/mm/gup_longterm.c >>> F: tools/testing/selftests/mm/gup_test.c >>> >>> diff --git a/tools/mm/.gitignore b/tools/mm/.gitignore >>> index 922879f93fc8..154d740be02e 100644 >>> --- a/tools/mm/.gitignore >>> +++ b/tools/mm/.gitignore >>> @@ -2,3 +2,5 @@ >>> slabinfo >>> page-types >>> page_owner_sort >>> +thp_swap_allocator_test >> >> ^ Does that belong into this patch? >> >>> +gup_bench >> >> I wonder if it makes sense to "git mv" the existing tool (only slightly fixing >> header inclusion to make it compile), essentially removing the old benchmark. >> >> So it would be >> >> 1) Move tools, fixing up includes and removing the gup testing logic+matrix to >> make it compile > > I like your idea, it would reduce churn. But is it okay that there will be an > intermediate state in which gup_test is not there? Wouldn't we call this a > "regression"? I don't really see why that as a problem as we are effectively removing the old test and replacing it by a new one? In fact, while at it, we can just call the new test "gup.c", as the "_test" is superfluous. -- Cheers, David