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Sun, 21 Dec 2025 03:58:32 -0500 X-MC-Unique: 1EQ6i2C-MaCOWXvOsRCSJg-1 X-Mimecast-MFC-AGG-ID: 1EQ6i2C-MaCOWXvOsRCSJg_1766307511 Received: from mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-01.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.4]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 4A31E195608D; Sun, 21 Dec 2025 08:58:31 +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-01.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 9937030001A2; Sun, 21 Dec 2025 08:58:27 +0000 (UTC) From: Li Wang To: akpm@linux-foundation.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: David Hildenbrand , Mark Brown , Shuah Khan , Waiman Long Subject: [PATCH v2 3/3] selftests/mm/charge_reserved_hugetlb: fix hugetlbfs mount size for large hugepages Date: Sun, 21 Dec 2025 16:58:10 +0800 Message-ID: <20251221085810.3163919-4-liwang@redhat.com> In-Reply-To: <20251221085810.3163919-1-liwang@redhat.com> References: <20251221085810.3163919-1-liwang@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Scanned-By: MIMEDefang 3.4.1 on 10.30.177.4 X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 17948120006 X-Stat-Signature: 3cqzdju9ihfj5xbgxcjuoi99ijyg67n5 X-HE-Tag: 1766307514-480436 X-HE-Meta: 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 if6EVrXe /AuqczbNjN2VtBM27x9bMfpj3l1LSjzOf/wfbM9lNtK+ziOPbto88aCn413iLQsFgikJronDLoQ9fWdmxXAT4Rh9l21niF8eJbYEemUMBoZ5t5GuDNBW6fnDeKvYHsHLsR96WhYGP3Bh7z9dPDwGVGfhgfszwfpGggxFwPsypntw6KkeEy2dE8/raVaU/ysYMdbQJNCsIEmL1ZF/0afGY6O5e0Q9wtzyy2kGCC8RI8VjCOx9A9dTFa/4c7oEmD8+EB1nix7JbuYNP0mr6K+XilAUKArob0Kec2J5fk9uLILkSpAa5y/hk8T3/yvcltisvlW2VCKqA2jX5IhJmQrGCkhkm/I0Cb+XGoRlh1Mss6kHDdABPrdMyR64E2Tv0k3GqvQyUTgzmsO3tbrpoxx4urxmMeQ== 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=${size}, the number of bytes the test will reserve/write, so the filesystem capacity is sufficient regardless of HugeTLB page size. Signed-off-by: Li Wang Cc: David Hildenbrand Cc: Mark Brown Cc: Shuah Khan Cc: Waiman Long --- tools/testing/selftests/mm/charge_reserved_hugetlb.sh | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh index 249a5776c074..ac2744dbc0bd 100755 --- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh +++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -295,7 +295,7 @@ function run_test() { setup_cgroup "hugetlb_cgroup_test" "$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