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Sat, 20 Dec 2025 11:17:10 +0000 (UTC) Received: from dell-per7425-02.rhts.eng.pek2.redhat.com (dell-per7425-02.rhts.eng.pek2.redhat.com [10.73.116.18]) by mx-prod-int-06.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 02FA9180066C; Sat, 20 Dec 2025 11:17:06 +0000 (UTC) From: Li Wang To: linux-kselftest@vger.kernel.org, akpm@linux-foundation.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: David Hildenbrand , Mark Brown , Shuah Khan , Waiman Long Subject: [PATCH 3/3] selftests/mm/charge_reserved_hugetlb: fix hugetlbfs mount size for large hugepages Date: Sat, 20 Dec 2025 19:16:45 +0800 Message-ID: <20251220111645.2246009-4-liwang@redhat.com> In-Reply-To: <20251220111645.2246009-1-liwang@redhat.com> References: <20251220111645.2246009-1-liwang@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.93 X-Rspamd-Queue-Id: 389DB1C000A X-Rspamd-Server: rspam03 X-Stat-Signature: d3u7rxdhj3k5gbdwxpt7yxis7ufri8b6 X-Rspam-User: X-HE-Tag: 1766229438-167428 X-HE-Meta: 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 GG9Nek/b 4zeIL0uu3EI+BJLf9MucUqWpPbbqpnu8Z9vFkGzLvIp0tP3t5q6HHcEckgHwtkp6cywPwjwj/0s3ab6TgTZNhHBYxDLudBcMPz87syf4YXkYJi5T4P2E9rGqhO2itgGlq1Sbcw+MASXUQGcLHuUYVzaGUoutEshl9p24Nq0HVXUbT0hjj53K+083Faz46ReQ/AvlUytq+/BybxJtcua39ThSephNaHK6p+6vmPLJG8Y/lPrvb6J3zkGQtYmjcHpHNTz+q8RpdJNVyQ8a8jPiIuVd4uTZdQ7xOVZOUm32u+1MyE9tzhiqhirYNzA1zj0AEGTTM28lPslIBM3mSdMyqv0w2tAjwFQwj86EcIvWuI/mncjzlnK25Cgtl29SanmNvXOEMlLsyIu6Ipqi6LuK9XRDbnQ== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: charge_reserved_hugetlb.sh mounts a hugetlbfs instance at /mnt/huge with a fixed size of 256M. On systems with large base hugepages (e.g. 512MB), this is smaller than a single hugepage, so the hugetlbfs mount ends up with effectively zero capacity (often visible as size=0 in mount output). As a result, write_to_hugetlbfs fails with ENOMEM and the test can hang waiting for progress. --- Error log --- # uname -r 6.12.0-xxx.el10.aarch64+64k #./charge_reserved_hugetlb.sh -cgroup-v2 # ----------------------------------------- ... # nr hugepages = 10 # writing cgroup limit: 5368709120 # writing reseravation limit: 5368709120 ... # write_to_hugetlbfs: Error mapping the file: Cannot allocate memory # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 # Waiting for hugetlb memory reservation to reach size 2684354560. # 0 ... # mount |grep /mnt/huge none on /mnt/huge type hugetlbfs (rw,relatime,seclabel,pagesize=512M,size=0) # grep -i huge /proc/meminfo ... HugePages_Total: 10 HugePages_Free: 10 HugePages_Rsvd: 0 HugePages_Surp: 0 Hugepagesize: 524288 kB Hugetlb: 5242880 kB Mount hugetlbfs with size=${size}, the number of bytes the test will reserve/write, so the filesystem capacity is sufficient regardless of HugeTLB page size. Signed-off-by: Li Wang Cc: David Hildenbrand Cc: Mark Brown Cc: Shuah Khan Cc: Waiman Long --- tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh index 6aa4ce66922c..9deb3dc2cbce 100755 --- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh +++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -295,7 +295,7 @@ function run_test() { setup_cgroup "hugetlb_cgroup_test" "$cgroup_limit" "$reservation_limit" mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=${MB}M,size=256M none /mnt/huge + mount -t hugetlbfs -o pagesize=${MB}M,size=${size} none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test" "$size" "$populate" \ "$write" "/mnt/huge/test" "$method" "$private" "$expect_failure" \ @@ -349,7 +349,7 @@ function run_multiple_cgroup_test() { setup_cgroup "hugetlb_cgroup_test2" "$cgroup_limit2" "$reservation_limit2" mkdir -p /mnt/huge - mount -t hugetlbfs -o pagesize=${MB}M,size=256M none /mnt/huge + mount -t hugetlbfs -o pagesize=${MB}M,size=${size} none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test1" "$size1" \ "$populate1" "$write1" "/mnt/huge/test1" "$method" "$private" \ -- 2.49.0