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b=nEWtcsSMv3X8IEXCQ8ilT++XBsGdu99zZSG4GQRMRicqoAG6z7D4s6Sjcs2zUs3Gi MnOPLHswFOUldvFzErPD/etpuQLMhf2/vK/MCoP+HH8USOFpWUxMmUZDE+Hp9J8AIN XUF+AUjgp1z3J7udB81iSZwKamO0vXN24lvP37+viWs33PipIh9TX4YCM+6RAvnEUO mhITa188sLjIon2/QrFf6fH/KWGXOddMJ/7xOQJRQ8wVMEXEEkaAad7A5SJdrJ3Fhf WZBk4EVYR3+do0mkL5Ns2xDjdTsgxUTQbFgg7vIqmzq1CyJUAWsfgLHfZkVWnriwiQ wF4vF/1jj41GA== Message-ID: <970fa015-9ec8-4903-8e2f-f3e847d550d1@kernel.org> Date: Sun, 21 Dec 2025 10:17:12 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 3/3] selftests/mm/charge_reserved_hugetlb: fix hugetlbfs mount size for large hugepages 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: <20251221085810.3163919-1-liwang@redhat.com> <20251221085810.3163919-4-liwang@redhat.com> From: "David Hildenbrand (Red Hat)" Content-Language: en-US In-Reply-To: <20251221085810.3163919-4-liwang@redhat.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 7bit X-Stat-Signature: r1uia9yob6gwjzkxqfeaa4ie44dyqn73 X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 704DA4000C X-Rspam-User: X-HE-Tag: 1766308638-728780 X-HE-Meta: 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 4PCI7ESc rlOrbNQvNYV9B7RcOSu+v/RdVfqENcS69pNr2KkukC5W+6zsyOpyWX3hXn6bYm2bK1HUOa6wOG4Rj16uGLcCSGBwCnT3VAgLEpE0GJsU1kiAIdF1mCM7kcj4cphcfCinFiW3lE75fcpU1EAf5BtGtGfI28a9mQyHYH9BUcwEIkmHum6Sei5gHRuQNsJRewWPETzSXT403h7V2glpJmWu2JJ4qyAQvVF4NdaQX0uO4iqffVavWpocozthgM+b+0fta5LlGsaB21AWTqpwXIzMITJUM1ApNwZAEmmmjevExi8lECeFb1mtbsZYg1A== 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 09:58, 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 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. I'm curious, what's the history of using "256MB" in the first place (or specifying any size?). -- Cheers David