From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out30-132.freemail.mail.aliyun.com (out30-132.freemail.mail.aliyun.com [115.124.30.132]) (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 14C55346E7A; Thu, 6 Aug 2026 03:34:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.132 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785987286; cv=none; b=L1Q9EN+p4KI6UpYU0DUvo2qBmCaPos1Qae7g9dRD/wcBH1hsd5rd8fIo3XvAYN2k8soiHRGA7uIaEO1w5+DA9xELAOf1ANnUHnXSMKmBX4w5Vkh+aShldSftyC3H+rIgDefCGftnSsX883058RYDHO/Si8BgJz409D2T0zYTM/c= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1785987286; c=relaxed/simple; bh=6m3LqiTH3to5XVoAe+K9dfrUghMuLZ2vGY9XnUYG5Yg=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=QnjEXkyunEkVB2ZlbIq12hlxnkN8RWvBO8g74bUStbjKrPwBUBNqEyTp+nKO3Cw+p7x1/SqfFnFUbkoxJMBSTxeB6qNsOTijedykTDjzPe3drOdYzsuxvYENYnblUX0QPWN0s1ABAcZaTL437qc56igulyARXCWh/5aoKjD5vp4= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com; spf=pass smtp.mailfrom=linux.alibaba.com; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b=Sfocj12s; arc=none smtp.client-ip=115.124.30.132 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.alibaba.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.alibaba.com header.i=@linux.alibaba.com header.b="Sfocj12s" DKIM-Signature:v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1785987274; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=6LrUd86Cka2Fg/6CzJjG2iZT3DCfqjLks/rpZbSOQ0w=; b=Sfocj12sLHtMLIga/CbjY5rX6WinINW6qKUN965yYNOOlfylFqrY0wCVkAn2gly1osdpVk/NghknuYyZvHdTAVSPEvrLmUXKwsq4qyElq+pZzTpGzqjLDVmtDYP3FY7P3vAu7nUge0TOdsqGr0dVbIzcvO9CGt/uQmE8JSk8bRs= X-Alimail-AntiSpam:AC=PASS;BC=-1|-1;BR=01201311R841e4;CH=green;DM=||false|;DS=||;FP=0|-1|-1|-1|0|-1|-1|-1;HT=maildocker-contentspam033032089153;MF=baolin.wang@linux.alibaba.com;NM=1;PH=DS;RN=16;SR=0;TI=SMTPD_---0X8SfgDs_1785987273; Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0X8SfgDs_1785987273 cluster:ay36) by smtp.aliyun-inc.com; Thu, 06 Aug 2026 11:34:33 +0800 From: Baolin Wang To: akpm@linux-foundation.org, david@kernel.org, ljs@kernel.org Cc: ziy@nvidia.com, liam@infradead.org, nico.pache@linux.dev, dev.jain@arm.com, ryan.roberts@arm.com, baohua@kernel.org, lance.yang@linux.dev, usama.arif@linux.dev, kas@kernel.org, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v3 3/4] selftests: mm: implement the mTHP-sized hugepage check helpers Date: Thu, 6 Aug 2026 11:34:14 +0800 Message-ID: <56b16691f605426b33b5cf47319233de6127a6b3.1785985999.git.baolin.wang@linux.alibaba.com> X-Mailer: git-send-email 2.43.5 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Implement mTHP-sized hugepage checking helpers using gather_folio_orders(). Also rename the existing PMD-sized huge page check function to __check_pmd_huge() for clarity. Reviewed-by: Nico Pache (Red Hat) Tested-by: Nico Pache (Red Hat) Acked-by: Kiryl Shutsemau (Meta) Signed-off-by: Baolin Wang --- tools/testing/selftests/mm/vm_util.c | 76 ++++++++++++++++++++++++++-- 1 file changed, 72 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests/mm/vm_util.c index 5a427f494cd8..13b5cff7dfe3 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -15,6 +15,9 @@ #define SMAP_FILE_PATH "/proc/self/smaps" #define STATUS_FILE_PATH "/proc/self/status" #define MAX_LINE_LENGTH 500 +#define PAGEMAP_PATH "/proc/self/pagemap" +#define KPAGEFLAGS_PATH "/proc/kpageflags" +#define MAX_NR_ORDERS 20 unsigned int __page_size; unsigned int __page_shift; @@ -348,7 +351,7 @@ char *__get_smap_entry(void *addr, const char *pattern, char *buf, size_t len) return entry; } -bool __check_huge(void *addr, char *pattern, int nr_hpages, +static bool __check_pmd_huge(void *addr, char *pattern, int nr_hpages, uint64_t hpage_size) { char buffer[MAX_LINE_LENGTH]; @@ -366,19 +369,84 @@ bool __check_huge(void *addr, char *pattern, int nr_hpages, return thp == (nr_hpages * (hpage_size >> 10)); } +static bool check_large_folios(void *addr, size_t len, int nr_hpages, + uint64_t hpage_size) +{ + int order = 0, pagesize = getpagesize(); + unsigned int nr_pages = hpage_size / pagesize; + int orders[MAX_NR_ORDERS], status; + int pagemap_fd, kpageflags_fd; + bool ret = false; + + if (!nr_pages) + ksft_exit_fail_msg("invalid hugepage size\n"); + + order = 31 - __builtin_clz(nr_pages); + if (!order || order >= MAX_NR_ORDERS) + ksft_exit_fail_msg("invalid order\n"); + + memset(orders, 0, sizeof(int) * MAX_NR_ORDERS); + pagemap_fd = open(PAGEMAP_PATH, O_RDONLY); + if (pagemap_fd == -1) + ksft_exit_fail_msg("read pagemap fail\n"); + + kpageflags_fd = open(KPAGEFLAGS_PATH, O_RDONLY); + if (kpageflags_fd == -1) { + close(pagemap_fd); + ksft_exit_fail_msg("read kpageflags fail\n"); + } + + status = gather_folio_orders(addr, len, pagemap_fd, + kpageflags_fd, orders, MAX_NR_ORDERS); + if (status) + goto out; + + if (orders[order] == nr_hpages) + ret = true; + +out: + close(pagemap_fd); + close(kpageflags_fd); + return ret; +} + bool check_huge_anon(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) { - return __check_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size); + uint64_t pmd_pagesize = read_pmd_pagesize(); + + if (!pmd_pagesize) + ksft_exit_fail_msg("reading PMD pagesize failed\n"); + + if (hpage_size == pmd_pagesize) + return __check_pmd_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size); + + return check_large_folios(addr, len, nr_hpages, hpage_size); } bool check_huge_file(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) { - return __check_huge(addr, "FilePmdMapped:", nr_hpages, hpage_size); + uint64_t pmd_pagesize = read_pmd_pagesize(); + + if (!pmd_pagesize) + ksft_exit_fail_msg("reading PMD pagesize failed\n"); + + if (hpage_size == pmd_pagesize) + return __check_pmd_huge(addr, "FilePmdMapped:", nr_hpages, hpage_size); + + return check_large_folios(addr, len, nr_hpages, hpage_size); } bool check_huge_shmem(void *addr, size_t len, int nr_hpages, uint64_t hpage_size) { - return __check_huge(addr, "ShmemPmdMapped:", nr_hpages, hpage_size); + uint64_t pmd_pagesize = read_pmd_pagesize(); + + if (!pmd_pagesize) + ksft_exit_fail_msg("reading PMD pagesize failed\n"); + + if (hpage_size == pmd_pagesize) + return __check_pmd_huge(addr, "ShmemPmdMapped:", nr_hpages, hpage_size); + + return check_large_folios(addr, len, nr_hpages, hpage_size); } int64_t allocate_transhuge(void *ptr, int pagemap_fd) -- 2.47.3