From nobody Sat Oct 4 06:37:15 2025 Received: from out30-113.freemail.mail.aliyun.com (out30-113.freemail.mail.aliyun.com [115.124.30.113]) (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 C6CCE2E03FE for ; Wed, 20 Aug 2025 09:07:52 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=115.124.30.113 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755680875; cv=none; b=PokoFeG5U8iYc3oph9c7eXxrFI/+VRG+z55yjWNMT+6z65azDbmo0Yk67Wl6l/20xJVJ4ak74aeGfmvbNLEazFhZBJ/IRoQKRxBywlzb4k58nrn7sJClFRoUItzPsAb26Roy8SIF4M+nobA2qOOsAFANkFy18zlUsEguIWuprpU= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1755680875; c=relaxed/simple; bh=O/EL/GABzezzJnhdCns5+dqaFA0xQGxrWt+V6vBqbzA=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=H53a63bD+1+syGEApE5OGBRQCsTKbcCzZqFw3JPhkH6CTP1d4G6PEA86aFnzT/sYRgkXreLuXhShCx2J8f6wJKiDjgj3+VUkR4EvCLInJRQV9akYncqscNdqcfV5xlIOSeAP4QceM3LAipBtvj4tZOUyUae+vxAZ7Nh5RMtWgPk= 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=Ue2WAyMS; arc=none smtp.client-ip=115.124.30.113 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="Ue2WAyMS" DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.alibaba.com; s=default; t=1755680869; h=From:To:Subject:Date:Message-ID:MIME-Version; bh=k0BMZl4FO1A/3YqzLq6Cu8hUlXulJA4evFI5qXofcb4=; b=Ue2WAyMSnWxBSuqN+JfaZ3fR+nRVSxhymHNuwfUPg3Y0xfupfZefzVJp3+u6fo6WWROGqs9/Gix4DR6PvTO73u0X1KB1lfl3jVcUDvyiKZPULh1r18dFJxT/S1u/SqiRNkIZnMWvW/QCkap+S++bgPzC0ykghd8ONFQ1FJ2Gk+s= Received: from localhost(mailfrom:baolin.wang@linux.alibaba.com fp:SMTPD_---0WmBYU.i_1755680866 cluster:ay36) by smtp.aliyun-inc.com; Wed, 20 Aug 2025 17:07:47 +0800 From: Baolin Wang To: akpm@linux-foundation.org, hughd@google.com, david@redhat.com, lorenzo.stoakes@oracle.com Cc: ziy@nvidia.com, Liam.Howlett@oracle.com, npache@redhat.com, ryan.roberts@arm.com, dev.jain@arm.com, baohua@kernel.org, baolin.wang@linux.alibaba.com, linux-mm@kvack.org, linux-kernel@vger.kernel.org Subject: [RFC PATCH 10/11] selftests: mm: implement the mTHP hugepage check helper Date: Wed, 20 Aug 2025 17:07:21 +0800 Message-ID: <85ad632e5ac5844a4e8a6266bcd647932e4d0b11.1755677674.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: quoted-printable Content-Type: text/plain; charset="utf-8" Implement the mTHP hugepage check helper. Signed-off-by: Baolin Wang --- tools/testing/selftests/mm/vm_util.c | 52 +++++++++++++++++++++++++--- 1 file changed, 48 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/mm/vm_util.c b/tools/testing/selftests= /mm/vm_util.c index 853c8a4caa1d..d0f8aa66b988 100644 --- a/tools/testing/selftests/mm/vm_util.c +++ b/tools/testing/selftests/mm/vm_util.c @@ -16,6 +16,10 @@ #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 GET_ORDER(nr_pages) (31 - __builtin_clz(nr_pages)) +#define NR_ORDERS 20 =20 unsigned int __page_size; unsigned int __page_shift; @@ -353,7 +357,7 @@ char *__get_smap_entry(void *addr, const char *pattern,= char *buf, size_t len) return entry; } =20 -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]; @@ -371,19 +375,59 @@ bool __check_huge(void *addr, char *pattern, int nr_h= pages, return thp =3D=3D (nr_hpages * (hpage_size >> 10)); } =20 +static bool check_large_folios(void *addr, unsigned long size, int nr_hpag= es, uint64_t hpage_size) +{ + int pagesize =3D getpagesize(); + int order =3D GET_ORDER(hpage_size / pagesize); + int pagemap_fd, kpageflags_fd; + int orders[NR_ORDERS], status; + bool ret =3D false; + + memset(orders, 0, sizeof(int) * NR_ORDERS); + + pagemap_fd =3D open(PAGEMAP_PATH, O_RDONLY); + if (pagemap_fd =3D=3D -1) + ksft_exit_fail_msg("read pagemap fail\n"); + + kpageflags_fd =3D open(KPAGEFLAGS_PATH, O_RDONLY); + if (kpageflags_fd =3D=3D -1) { + close(pagemap_fd); + ksft_exit_fail_msg("read kpageflags fail\n"); + } + + status =3D gather_folio_orders(addr, size, pagemap_fd, + kpageflags_fd, orders, NR_ORDERS); + if (status) + goto out; + + if (orders[order] =3D=3D nr_hpages) + ret =3D true; + +out: + close(pagemap_fd); + close(kpageflags_fd); + return ret; +} + bool check_huge_anon(void *addr, unsigned long size, int nr_hpages, uint64= _t hpage_size) { - return __check_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size); + if (hpage_size =3D=3D read_pmd_pagesize()) + return __check_pmd_huge(addr, "AnonHugePages: ", nr_hpages, hpage_size); + + return check_large_folios(addr, size, nr_hpages, hpage_size); } =20 bool check_huge_file(void *addr, int nr_hpages, uint64_t hpage_size) { - return __check_huge(addr, "FilePmdMapped:", nr_hpages, hpage_size); + return __check_pmd_huge(addr, "FilePmdMapped:", nr_hpages, hpage_size); } =20 bool check_huge_shmem(void *addr, unsigned long size, int nr_hpages, uint6= 4_t hpage_size) { - return __check_huge(addr, "ShmemPmdMapped:", nr_hpages, hpage_size); + if (hpage_size =3D=3D read_pmd_pagesize()) + return __check_pmd_huge(addr, "ShmemPmdMapped:", nr_hpages, hpage_size); + + return check_large_folios(addr, size, nr_hpages, hpage_size); } =20 int64_t allocate_transhuge(void *ptr, int pagemap_fd) --=20 2.43.5