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Sun, 21 Dec 2025 01:44:35 -0800 (PST) X-Google-Smtp-Source: AGHT+IGL1i6p8N2hSuUv+xL5rM61Q5+a8Vkv7Ev7XAzGkSrg7/P90k3Cd5PYS0PYFknoNJAdnKhv9+PtZSswlmQYASE= X-Received: by 2002:a05:7300:cf92:b0:2a4:61a1:c0d5 with SMTP id 5a478bee46e88-2b05ec97dc9mr9020789eec.36.1766310274957; Sun, 21 Dec 2025 01:44:34 -0800 (PST) MIME-Version: 1.0 References: <20251221085810.3163919-1-liwang@redhat.com> <20251221085810.3163919-4-liwang@redhat.com> <970fa015-9ec8-4903-8e2f-f3e847d550d1@kernel.org> In-Reply-To: <970fa015-9ec8-4903-8e2f-f3e847d550d1@kernel.org> From: Li Wang Date: Sun, 21 Dec 2025 17:44:22 +0800 X-Gm-Features: AQt7F2pHfdiMRMRnZKTZtwZEUfCrHUSow0ksQmNv49Fll4mVQHzB9tXkUYQfG5U Message-ID: Subject: Re: [PATCH v2 3/3] selftests/mm/charge_reserved_hugetlb: fix hugetlbfs mount size for large hugepages To: "David Hildenbrand (Red Hat)" Cc: akpm@linux-foundation.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Mark Brown , Shuah Khan , Waiman Long X-Mimecast-Spam-Score: 0 X-Mimecast-MFC-PROC-ID: o-mQsVky4YFjNKCPbXKOMLwWiGDR290NiWkmG17BWLw_1766310275 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Rspamd-Queue-Id: 00EB7140003 X-Rspamd-Server: rspam04 X-Stat-Signature: 4uqmpuub8bzniakrdo1647581987dbn7 X-HE-Tag: 1766310278-797846 X-HE-Meta: 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 PLFAB9GP 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 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: David Hildenbrand (Red Hat) wrote: > 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?). Seems the script initializes it with "256MB" from: commit 29750f71a9b4cfae57cdddfbd8ca287eddca5503 Author: Mina Almasry Date: Wed Apr 1 21:11:38 2020 -0700 hugetlb_cgroup: add hugetlb_cgroup reservation tests -- Regards, Li Wang