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b=RryvzxVodQXnTn9xCQPXMltWlXFJUlt2CgjGTaFdlp3t47wbs06NkPGko17Gn7EwB inEpa3tjRZt+nKqmvwvEn4W4IOvpPi3ky4isPC0Garl3xZURW0gnMQlH18zP2x4aGL yfHqHhECqm+Kcs5e2l1vfdvdfcB+7XJG1IK4HylWDb30WtB10Qrfdl0zRId2e59FaA KaST5P/UgZBvneg1skrfBzPDE8nobSWcxndU+OLP9ccVo0LQ7GLJ6eav3t/6NCYslB MUlLjJ0z0zYd8A0a5ossTczuz+JyrsCA143s9mbyGmMjwi1gvWhJLrWrtu1b7Smhit OXfmJyJ7KgTOQ== Message-ID: <714bdcbb-92cd-4dde-820c-e3761cbbaf07@kernel.org> Date: Thu, 16 Jul 2026 13:25:22 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 2/2] selftests/mm: add PAGEMAP_SCAN test for THP PMD holes To: Kiryl Shutsemau , akpm@linux-foundation.org Cc: usama.anjum@arm.com, peterx@redhat.com, liam@infradead.org, ljs@kernel.org, vbabka@kernel.org, jannh@google.com, pfalcato@suse.de, rppt@kernel.org, surenb@google.com, mhocko@suse.com, zenghui.yu@linux.dev, shuah@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-kselftest@vger.kernel.org, stable@vger.kernel.org, kernel-team@meta.com References: <20260715144234.442721-1-kirill@shutemov.name> <20260715144234.442721-3-kirill@shutemov.name> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: B5DC840007 X-Rspam-User: X-Stat-Signature: pyekyc33aqmu8ejpdsbxxht8r6fbew3g X-Rspamd-Server: rspam03 X-HE-Tag: 1784201129-517827 X-HE-Meta: U2FsdGVkX1/uwY7zulFCCnLb47hf1RcuowLm0NO63/MdIMmPrhTPUTMtHjFlgjTgUDp0ou9XNiBnDZQ+fqPdn8VNVDZkkxaxoTVtaZ+abc7asf2cpiicW5xKA5RDT+hE5kZ39ezIhhJjwW8R20bnM7GADdeMkl9ITEIS45nUZ2OQU7EChfNdST40NWjqV6UKiRVBKcD2BIKtuPjz++8Yz1mxKp47tw5YseBx17WiBUQJtVYgqTvgNBUWUXdKCn1uCN5zRgJLZ1i4FSNXQGyGvmaVrO94e4zoYcWaWUvfv6ftHCwAQCd61n4LRk627vnTGaidEQ3EUHEVOms4hk73rU7ckEgUd5D2MaqoN+DimMS1CA8Wgfj0ezDED5rSJxkPQ2doN1+SNCrn1jKYZI1UjVFT4AnXpP8jNq+Q943iGH9LqOZN7zDMfkaqDkbbkmG/BXt684KMrh0M1Wx8x8gJqn5vRPLsWeiBcCrHfI2Rej7O9n7zPvGCVAL0/3+kChAEKiKg2qf07fakRk1DmmBS6VTMjsFOQE9gCmeAq+zEf0E6yT2mR5cexHe9cEuKZIilxDXbNrHc6tq87N4YYFrbHKwSARNaaOsv42RX8JwO5fyJKmIVi915ciRh+OUSo+SqJcnJU6tcZCicUKXx6EpexkI5vfDJSU8tc8gzli+ulyMRl2PDU3uAefii0W1v84YoWVvpXoyJjZ+KSFjRuGFh698ihMQUgwfPM6+T7zEWEjKxka5q7rlSNtwwC/hUhuMPb5HzMsafMR6kkIXwH96zdQAjxkUVNy3L607INkUsP8f/JSyBmvZq3QXDFvtFDj26ZQo2I89wjRYPN5qFYCYVEZZV3vtUz5iLQoksWHclF7sfkbx5JaqhaMlcj3F4DGM2t4RRM+hZ9tqR8O+5RRaxEM4Oq7HivkWYXaYrPQjEWX/Ov4wkcRnGBw1sqE+3dcwLl4m4flyevqHkPKOG61v 0Wh1QecL KPJgtrstspwUZbNcgLLyy33kKa7NykwL4VkaSrwoWrU62IWqN2GT69+Njp9ebB+pOcC4+3Gyzf/1rew9ZfvSgtZ1V5vVAk6qD1dX5xUmQcHHU8+b6Wd6NECmPqwGJ6JIUNOITZNhmHCZBaXmEP6PJ8f6L+9J9QeKSiuwe2ishXcO159XYtgqNj91cdERTG+/c30Ayzqd26PLp8m2fNp3oQX65eJKqSWXNvHvcJ5gl6MjLlPd+dk24BHq4h73gnFbdtQDSzpSu+Pd29Po4YXAiUI1lhKPKXQtknKSQNfUxSvCxJraFLPLWR9uwVA== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > + /* Fast path: category_mask == return_mask == PAGE_IS_WRITTEN. */ > + ret = pagemap_ioctl(mem, hpage_size, regions, ARRAY_SIZE(regions), 0, 0, > + PAGE_IS_WRITTEN, 0, 0, PAGE_IS_WRITTEN); > + for (i = 0; ret > 0 && i < ret; i++) > + fast += LEN(regions[i]); > + > + /* Generic path: same query expressed via category_anyof_mask. */ > + ret = pagemap_ioctl(mem, hpage_size, regions, ARRAY_SIZE(regions), 0, 0, > + 0, PAGE_IS_WRITTEN, 0, PAGE_IS_WRITTEN); > + for (i = 0; ret > 0 && i < ret; i++) > + slow += LEN(regions[i]); > + > + ksft_test_result(fast == npages && slow == npages, > + "%s pmd-hole reported written by both paths (%ld, %ld of %d)\n", > + __func__, fast, slow, npages); > +out: > + wp_free(mem, hpage_size); > + munmap(area, 2 * hpage_size); > +} Sorry if I wasn't clear. I think unpopulated_thp_scan_test() can actually reuse bits of unpopulated_scan_test(). Either by having a magical "use_thp" parameter or by factoring stuff out into a helper. Or am I missing an important point why that would not work or be really ugly? -- Cheers, David