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spf=pass (imf08.hostedemail.com: domain of david@kernel.org designates 172.234.252.31 as permitted sender) smtp.mailfrom=david@kernel.org ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=hostedemail.com; s=arc-20220608; t=1766397682; h=from:from:sender:reply-to:subject:subject:date:date: message-id:message-id:to:to:cc:cc:mime-version:mime-version: content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references:dkim-signature; bh=m5Bz4tO3gwTCc6d/A0Rq2sVC4ZUyh9FsoFcJbvZuEAo=; b=DdeUBq1vXovmIsw1eZwBskoogXUAB+ZtPQfUC6NlIUrjBD4XcPHjuWcU09qpdp+MWrm0Vd fzkzLD0OKwq+PlH9Z9bWDIqSQyO4GG4yqrG09GOaverXQltBSw3Vn+e8BsoMVk+0A/Hpep 8CnR0Bc21wr2wXFxSdd3Ie9xZ046QCY= Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by sea.source.kernel.org (Postfix) with ESMTP id E20054378D; Mon, 22 Dec 2025 10:01:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 3FDC0C4CEF1; Mon, 22 Dec 2025 10:01:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1766397680; bh=UZ4P5M3gSargbfZbWlgwDbORLDGuoxCS7PlKczHNQeU=; h=Date:Subject:To:Cc:References:From:In-Reply-To:From; b=LVjoBzrztNA4FDbA8DYzzhbUKtp7wwKmAN0wGhk+A7PwO20p8fHNzg7phwwNdmoBx N4WWaLh8wjVuMBW4ErbmhKLRO5YCHdmN8ulX7vcdMZHEi2LQkygJDDiJw8CY6WNlv7 s6EbW8MjY7/Wy3FDAbe5+5dWbFUk0rGMdwa0x2UaiL3iGDpXlVe87A3OHlWY7uA82x p0GRBcd1YUfrnxkf+sW0+Af8cDYh/BTzPziOGknaRoc4MBGIWnTJSppq2G4/UkTmbt /mSCec2n0NyCpalqJhly6TObP6J4iYBxLap8EZfFGGwErKJ/nztdPHSGx8BN8rrzqv UBW6OvzgYRgvg== Message-ID: <53e302a7-1c78-4b76-87e8-1cc10c76535d@kernel.org> Date: Mon, 22 Dec 2025 11:01:17 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 2/3] selftests/mm/charge_reserved_hugetlb: drop mount size for hugetlbfs To: Li Wang , akpm@linux-foundation.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Cc: Mark Brown , Shuah Khan , Waiman Long References: <20251221122639.3168038-1-liwang@redhat.com> <20251221122639.3168038-3-liwang@redhat.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: <20251221122639.3168038-3-liwang@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: F071D16001E X-Stat-Signature: s86hrs57tpitzpwah3d9m6d1wx1sdowm X-HE-Tag: 1766397681-423128 X-HE-Meta: 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 JB10lgDe X1Nun 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: On 12/21/25 13:26, Li Wang wrote: > 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. > > Fixes: 29750f71a9 ("hugetlb_cgroup: add hugetlb_cgroup reservation tests") Likely Andrew should add a CC of stable Acked-by: David Hildenbrand (Red Hat) -- Cheers David