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 85A03CA5FCE for ; Thu, 1 Oct 2026 21:18:25 +0000 (UTC) Received: by kanga.kvack.org (Postfix) id 1ED7F6B0095; Thu, 1 Oct 2026 17:18:20 -0400 (EDT) Received: by kanga.kvack.org (Postfix, from userid 40) id 19DA46B0096; Thu, 1 Oct 2026 17:18:20 -0400 (EDT) X-Delivered-To: int-list-linux-mm@kvack.org Received: by kanga.kvack.org (Postfix, from userid 63042) id 08CCE6B0098; Thu, 1 Oct 2026 17:18:20 -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 BBFF06B0095 for ; Thu, 1 Oct 2026 17:18:19 -0400 (EDT) Received: from smtpin10.hostedemail.com (lb01a-stub [10.200.18.249]) by unirelay09.hostedemail.com (Postfix) with ESMTP id 2FA718054D for ; Thu, 1 Oct 2026 21:18:19 +0000 (UTC) X-FDA: 85275320718.10.C4EDAFA Received: from foss.arm.com (foss.arm.com [217.140.110.172]) by imf29.hostedemail.com (Postfix) with ESMTP id 2FA3112000D for ; Thu, 1 Oct 2026 21:18:17 +0000 (UTC) Authentication-Results: imf29.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=Jyc8ZHCL; spf=pass (imf29.hostedemail.com: domain of yeoreum.yun@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=yeoreum.yun@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1790889497; 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=sl6i3rrMXHMwq64OcowBKU4ydvJxEXr8IWC9j05j+cM=; b=76z1p7J0iHN36OSSC1MkcpJNYJqlPqUdyKA/NiRkDPUZrCCe1QZWjqbLp5iHASSzX7lL1Y +SfI61r3hu3aUm7D1vGLlaU6cL5OBuqYFodsV6C+5aehGwU8jD2nuL4j2NPDxuQunIjFU/ DgPpWEKYOGbik8BAzz7eXn+dbR1cKms= ARC-Authentication-Results: i=1; imf29.hostedemail.com; dkim=pass header.d=arm.com header.s=foss header.b=Jyc8ZHCL; spf=pass (imf29.hostedemail.com: domain of yeoreum.yun@arm.com designates 217.140.110.172 as permitted sender) smtp.mailfrom=yeoreum.yun@arm.com; dmarc=pass (policy=none) header.from=arm.com ARC-Seal: i=1; a=rsa-sha256; d=hostedemail.com; s=arc-20220608; cv=none; t=1790889497; b=ByntGppalFBRgL3s8qPppoPs7BPnY8XDe9iIg4AXZM65Qlg26D6CGwdWzzHpS1IqsW3HIG 2Tok0+NZ0Nf+bcjPzAkL0zJ+jbr0+0f+pOhwDFveerx0GPOplZvwDyhIGlDQXIE8/H4g5J GnHFHt1xFYSUFMf8sF/9v5vQ+wNvefs= Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id E28FC175A; Thu, 1 Oct 2026 14:18:12 -0700 (PDT) Received: from e129823.arm.com (e129823.arm.com [10.2.213.3]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id 760703F86F; Thu, 1 Oct 2026 14:18:13 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=simple/simple; d=arm.com; s=foss; t=1790889496; bh=2X2FQ5S7yrfALnr5wL0BPfM4xpUXDIjXutG9mQQGSqY=; h=From:Date:Subject:References:In-Reply-To:To:Cc:From; b=Jyc8ZHCLLwHG7ZAjNektnsZz+9/XDYtttWyz6ywgnTwFBdgk0KDILlPvQJCT3DS0v pZCjTNEgpZPtI86+8WsM91u0rdSQnJJmQSoEw4qwZYx7f2P7/SfK2pgbMxw7eT9Ssi VCHpcdrkBuiWBq9B6kC/UNGfNwJaAJHaYaTfsz7I= From: Yeoreum Yun Date: Thu, 01 Oct 2026 22:17:53 +0100 Subject: [PATCH v9 3/4] kselftest: mm: integrate huge page checks MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20261001-fix_split-v9-3-0f4ba8bbdbdf@arm.com> References: <20261001-fix_split-v9-0-0f4ba8bbdbdf@arm.com> In-Reply-To: <20261001-fix_split-v9-0-0f4ba8bbdbdf@arm.com> To: Andrew Morton , David Hildenbrand , Lorenzo Stoakes , Zi Yan , Baolin Wang , "Liam R. Howlett" , Nico Pache , Ryan Roberts , Dev Jain , Barry Song , Lance Yang , Usama Arif , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Shuah Khan , Kevin Brodsky Cc: linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, Yeoreum Yun X-Mailer: b4 0.13.0 X-Developer-Signature: v=1; a=openpgp-sha256; l=4868; i=yeoreum.yun@arm.com; h=from:subject:message-id; bh=2X2FQ5S7yrfALnr5wL0BPfM4xpUXDIjXutG9mQQGSqY=; b=owEB7QES/pANAwAKAW3Vw9FaxTEzAcsmYgBqvs4KL+VYw6FuAkln8r6pGcnUOji7ghXv/E3by IiMsp4UQWqJAbMEAAEKAB0WIQQtg+CS3QUzuFh1pJ1t1cPRWsUxMwUCar7OCgAKCRBt1cPRWsUx M0jIC/9Oy3YDlqMQOhtpXmcTDqbmS5SkuMsJsSQegOcTd3+vfXfZqnpayi20cf+I5ubDV4o26nt zR1Nhof1I4hMA2nEwK31tHk/BoP/2RsUCE1RYnn3R89XHG3+XiPf9LsnADGoNmNu24a0P4VokFf wZmO8/OJOvcmjaaQTNEuEx6zXtjwixBF02wAajUwx+Qrgy6qGxeLvABPIMLfX90lYg6ZXlYedgD OluxL6Tuquk3RF3i4jE2i7DdPnf6XAvpumDRVCoTrfwpH0JXq2iP3OWtcxpn4CeJkJXerkinXqu Hms/moyVKy+DM5tj95L7n3YgBBvRJz84O+grm3hrcEhk89cZdbMkVAApzZAsdOrUAOXkapDUB9C ezyJvUABMz5LbRWu0avPrt+Gz86J5UsnYhXGQYFwtiKSVoeRdSVH7ulYohSYocg6a33DCNyUZol o1QyLj9+m/C/Q3N2zbyknCrTAjbVZEnDiFZrEFBGrkF4bl5sIBQjHWduISVQ9Nw+K1M10= X-Developer-Key: i=yeoreum.yun@arm.com; a=openpgp; fpr=2D83E092DD0533B85875A49D6DD5C3D15AC53133 X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 2FA3112000D X-Rspam-User: X-Stat-Signature: ix4ts41bru69mmpz6mu5pgxh8fd8npyu X-HE-Tag: 1790889496-908505 X-HE-Meta: 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 8NvWc244 R1jgB+9hGJ86qFQ8UN27/oDuWEzRojTrqfwjBZOBOXkWwJxSzC4a4/ntTay0qLe/XOh2rVE7585EOZVNdsBwTBotFxd5fve24U6Z3me/sbMq2sfzhfj4CRr35oOpYFEkl1MmBKAJuUqJ7d7dAdSl5VJWPXfYFUwulpNX9JVELa8LOnBbDAiHnclGiiSHUjxwOOqMRa8TQr+psDcT8m4NCzlpvEaBbFP5vCqHo7zDmpeEFwlO3S0QIJKkY2XqHNfws8OZZQ2rRte9DQ4064KM7SWupKkBkkXIVTdmUbij0KX5eGzmebf9/mAisBw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: check_large_folios() only checks for large folios without distinguishing between anonymous and file-backed huge pages. To add huge page type checking, integrate the huge page checks into __check_huge() and __check_type(): 1. If hpage_size == pmd_pagesize, check PAGE_IS_HUGE instead of using check_large_folios(), since only the mapping type matters. This identifies PMD-mapped huge pages. 2. Otherwise, use check_large_folios() to detect large folios. This covers mTHP cases. 3. Check the folio flags according to the huge page type via __check_type() Suggested-by: David Hildenbrand (Arm) Suggested-by: Zi Yan Signed-off-by: Yeoreum Yun --- tools/testing/selftests/mm/vm_util.c | 90 ++++++++++++++++++++++-------------- 1 file changed, 56 insertions(+), 34 deletions(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index a3c3a2706c22..65c06e17c326 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -392,76 +392,98 @@ static bool check_large_folios(void *addr, size_t len, int nr_hpages, return ret; } -enum check_huge_type { - CHECK_HUGE_ANON, - CHECK_HUGE_FILE, +enum check_type { + CHECK_TYPE_ANON, + CHECK_TYPE_FILE, }; -static bool check_huge_type(uint64_t categories, enum check_huge_type type) +static bool __check_type(void *addr, size_t len, uint64_t page_size, + enum check_type type) { - const bool file = categories & PAGE_IS_FILE; + bool ret = false; + int pagemap_fd; + char *start = addr; + char *end = start + len; + uint64_t categories; - switch (type) { - case CHECK_HUGE_ANON: - return !file; - case CHECK_HUGE_FILE: - return file; + pagemap_fd = open(PAGEMAP_PATH, O_RDONLY); + if (pagemap_fd < 0) + ksft_exit_fail_perror("open pagemap"); + + for (; start < end; start += page_size) { + categories = pagemap_scan_get_categories(pagemap_fd, start); + if ((categories & PAGE_IS_PRESENT) != PAGE_IS_PRESENT) + continue; + + if ((type == CHECK_TYPE_FILE) != !!(categories & PAGE_IS_FILE)) + goto out; } - return false; + ret = true; + +out: + close(pagemap_fd); + return ret; } -static bool __check_pmd_huge(void *addr, size_t len, int nr_hpages, - uint64_t hpage_size, enum check_huge_type type) +static bool __check_huge(void *addr, size_t len, int nr_hpages, + uint64_t hpage_size) { + bool ret = false; int pagemap_fd; int nr_pmd_mappings = 0; + uint64_t pmd_pagesize; uint64_t categories; char *start = addr; char *end = start + len; + pmd_pagesize = read_pmd_pagesize(); + if (!pmd_pagesize) + ksft_exit_fail_msg("reading PMD pagesize failed\n"); + pagemap_fd = open(PAGEMAP_PATH, O_RDONLY); if (pagemap_fd < 0) ksft_exit_fail_perror("open pagemap"); + if (hpage_size != pmd_pagesize) { + ret = check_large_folios(addr, len, nr_hpages, hpage_size); + goto out; + } + for (; start < end; start += hpage_size) { categories = pagemap_scan_get_categories(pagemap_fd, start); - if (!(categories & PAGE_IS_HUGE)) - continue; - if (check_huge_type(categories, type)) + if (categories & PAGE_IS_HUGE) nr_pmd_mappings++; } - close(pagemap_fd); - return nr_hpages == nr_pmd_mappings; + if (nr_pmd_mappings != nr_hpages) + goto out; + + ret = true; + +out: + close(pagemap_fd); + return ret; } bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) { - uint64_t pmd_pagesize = read_pmd_pagesize(); - - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); + const uint64_t scan_mapping_size = (nr_hpages > 0) ? hpage_size : psize(); - if (hpage_size == pmd_pagesize) - return __check_pmd_huge(addr, len, nr_hpages, hpage_size, - CHECK_HUGE_ANON); + if (!__check_huge(addr, len, nr_hpages, hpage_size)) + return false; - return check_large_folios(addr, len, nr_hpages, hpage_size); + return __check_type(addr, len, scan_mapping_size, CHECK_TYPE_ANON); } bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) { - uint64_t pmd_pagesize = read_pmd_pagesize(); + const uint64_t scan_mapping_size = (nr_hpages > 0) ? hpage_size : psize(); - if (!pmd_pagesize) - ksft_exit_fail_msg("reading PMD pagesize failed\n"); - - if (hpage_size == pmd_pagesize) - return __check_pmd_huge(addr, len, nr_hpages, hpage_size, - CHECK_HUGE_FILE); + if (!__check_huge(addr, len, nr_hpages, hpage_size)) + return false; - return check_large_folios(addr, len, nr_hpages, hpage_size); + return __check_type(addr, len, scan_mapping_size, CHECK_TYPE_FILE); } bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) -- 2.43.0