From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (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 873723FF1AB; Sat, 28 Feb 2026 17:43:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300607; cv=none; b=scrv8Vx7tKNpjIIJk+PRGIrjIQ29alFNIJbXKBSHFACL34koxLr7huAREtD2HENzM/5RiGb7cNw3fF+Zj35p/vRNO4zEQdNMqQSj7ZcWvTP29OKOJU/Aa8b3Lrv3kXIfkpzZFJzuXOVfwk++hWZo3m7vDnQhXR+797cFv2qdRJo= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1772300607; c=relaxed/simple; bh=acpezPzvl69WK9Iiw/Yx2kb/8Q2BHP9ENnwHM2ALXNE=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=Fim4w+SlyLh5RiVG+WOEcp5dinzgj65oKuwjs+UE3QIdD76FxQ8CMuPFfEFk6RqouyxfFkgP027XWYt2blj7fCf3S7qjYNq/dfLLRVHM987BOLHwr5h3BWOAKnLFKMnxd/DGA3j2LFktaSUMW50b9n3wPXCM/1/tuLGD1Q5RAfg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=gbLZuSqh; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="gbLZuSqh" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 78E52C19425; Sat, 28 Feb 2026 17:43:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1772300607; bh=acpezPzvl69WK9Iiw/Yx2kb/8Q2BHP9ENnwHM2ALXNE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=gbLZuSqh3bzWJTRgRbH52ab1fjBQRByJdhbzgcb28GG84+rJswxNAcWEuWjQOYI86 zojjFxa+JoWl9vjsAJaVluXOumBbPuMTDl7u6bQu2KQeNSR43kbo3H0DMaZjLlNxG7 ljjakV7R1mP4dPp6Hf8VhPYQC3ek0nW01ya3JHDQa5m/m/QziS/CLjjattFkA2FmOt je4aLEih5n9s7+Nz0BQCyyjhQJK2LlBGwWfZJMcNBz8Y+PCpohwvuJXoLUBfQRfJQY +Z/16eWe48ccQNtN0/I2K0LUbQHYyPQfIyFguLLItSm8zScxHun2/IkMpfFM196MYo htLsPbEcI8XlA== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Li Wang , "David Hildenbrand (Red Hat)" , Waiman Long , Mark Brown , Shuah Khan , Andrew Morton , Sasha Levin Subject: [PATCH 6.19 647/844] selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs Date: Sat, 28 Feb 2026 12:29:20 -0500 Message-ID: <20260228173244.1509663-648-sashal@kernel.org> X-Mailer: git-send-email 2.51.0 In-Reply-To: <20260228173244.1509663-1-sashal@kernel.org> References: <20260228173244.1509663-1-sashal@kernel.org> Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit From: Li Wang [ Upstream commit 1aa1dd9cc595917882fb6db67725442956f79607 ] 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 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 Drop the mount args with 'size=256M', so the filesystem capacity is sufficient regardless of HugeTLB page size. Link: https://lkml.kernel.org/r/20251221122639.3168038-3-liwang@redhat.com Fixes: 29750f71a9b4 ("hugetlb_cgroup: add hugetlb_cgroup reservation tests") Signed-off-by: Li Wang Acked-by: David Hildenbrand (Red Hat) Acked-by: Waiman Long Cc: Mark Brown Cc: Shuah Khan Cc: Signed-off-by: Andrew Morton Signed-off-by: Sasha Levin --- 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 e1fe16bcbbe88..fa6713892d82d 100755 --- a/tools/testing/selftests/mm/charge_reserved_hugetlb.sh +++ b/tools/testing/selftests/mm/charge_reserved_hugetlb.sh @@ -290,7 +290,7 @@ 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 none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test" "$size" "$populate" \ "$write" "/mnt/huge/test" "$method" "$private" "$expect_failure" \ @@ -344,7 +344,7 @@ 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 none /mnt/huge write_hugetlbfs_and_get_usage "hugetlb_cgroup_test1" "$size1" \ "$populate1" "$write1" "/mnt/huge/test1" "$method" "$private" \ -- 2.51.0