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b=kK9sWOexAIu3PHE/vl+jtGi0muqtZYfbmbvglnEZqTqayzxospTi1EeEu0Daedt/8 03rsBOGFmSpKIvZ4gFsBYGqCQ2gi74RVAnD47YMK5DgUkv+MWJa3r1BAI8IO66vwIO H0Su0ifPrazwL7KOR6WRYVQMUml5pZDK9xOct3Jd2iaDymTQH/H8Vb2tIc5/aMC5H6 vsUl/hGhpYhZWw+q9D1aLS9Z4b4dQ4xy3ctQRFZ9iTYUtboKTDx6tqsNi7VXsn6Csk 85vdq4FHTE7lRa3LUfCYZ4R/je5keMvenwdi8UyLkCcpDUnfTpobllCzS7vXKlrh9U FCkJ/biDc/ZYA== Message-ID: Date: Thu, 16 Jul 2026 16:40:53 +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 Cc: akpm@linux-foundation.org, 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> <714bdcbb-92cd-4dde-820c-e3761cbbaf07@kernel.org> 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-Stat-Signature: e4h5yuhtxidcxwz5hqn9uhaq84d5bxf5 X-Rspamd-Queue-Id: 97213180006 X-Rspamd-Server: rspam01 X-Rspam-User: X-HE-Tag: 1784212858-275131 X-HE-Meta: U2FsdGVkX19NjRmJpiH6/1a+skut1+LZ+VWQbXWJFXA+S8615ah0vX83RxLd8FW+lzYwlBkayu/x8BZWCTJl+2grYY/KQ2FL/SUbwSy0n5d8vpXBVohgtfEtapesVKstfREguRFzn039zNKX/9zclCfZSYjS1wORym3jauyNE11cOYsIeTT5EyvUqjSlUdTEAwL4oWOSVxLXM0yV1MQhlrB5RB4Cu45f8ilefomJMTgDTFWLt/D+g2qm2M5zpQaS+rFZCHlC65ZaFNJRanHyMWXYthz20mA1tYoZBiwKlEWHO/0B1xAS9/1oK+393Wk5QXz04A4UlZQ5fKsrj6GhuO2cTEWqVFYb1U54IR5yHD47hsiuoILMmzCZU+SOejYXL4DOsn/g6SW25RVCj2OS0u+vy2jM2MVq9U4+8BL7q2Hi8TnUYqmjvKXHw8/u+PdcUVzGn2OJG9YMicheOnhA6c5PXwYEaEttr35z7SZzgFmJtRXmjyjMF4T4jtk1D6vE4Hi7Vnql4Xk9n/gGcS5H+h3WwP5Y3JoGQOEsNFo7sOJ6f0wd4Er3NtKhArY5BY6lzchSfPJ5VZwUQ6VHHhdfQakJ5aMrk2URMq9EegI/BFInFNyZTv+sfQjJkgu1uNiRqYzXa7iT7WxZ4nIoFkna2GXutDJnDahYBBjVEv/H1KcHWaMWqsXQ077D3KnMg0sZ4JtyBtLWmHFFtlrFRxTTD2OdFqCdhMVN8AfH42n1LmXi8TqKcsAtjPvU7Ge7gzr+vtxQzpfKm5IEA0mn+GVVpjK2SOFqaojPzQxVj74PIySBlXjZoYdVUikAEnGVOBNkQWHJhJYeqmnYEI5o9JiItUYhiZ2BgYEJINrRlcfPRKLw8eYe3Q2HzkjgdxN+6aK1+7k2RsufU9XYON84Z/jZ2qQM4egtBpE7OP1YJ/uNjkgGcJSPRRAw77NAMcJ2JQX/4GWt/fi7mPSRxAba724 fJvHQAR3 /i7NLHOLdG3qZwuV+9tsz6y0vCvgUrE/QG8abDsCU6UoT84cjJSsnUw5xklg9spzIVfZZt0WTvxMwInx2bdmzMViEEY/CsJ2uKWPv3KuOnNx1bcGXrKElzGWLfmvdwd/tZ9HcJNg9/aX092QbnPEybmX7L1i9pcMSNzv84GnMF7IVvngyLLzrVz1Nnr/kRAXvvVV6QzdGV8aBy1VkKiyleuqJJAouL7OPwKYJDbnadZXnBO8kuKUJ5hKNoeEw4zYJVjDqwHDiT52yoefEUEN0gmuqGAIZF1RLCm//X6F2/D63nfu1nw8c9HXIJw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/16/26 15:03, Kiryl Shutsemau wrote: > On Thu, Jul 16, 2026 at 01:25:22PM +0200, David Hildenbrand (Arm) wrote: >> >>> + /* 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(). > > Ah. Make sense. > > Here's my take on this. Looks good? Yes, thanks! -- Cheers, David