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[195.250.132.146]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-45eb6c9f598sm4662287f8f.6.2026.05.22.07.17.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 22 May 2026 07:17:20 -0700 (PDT) Date: Fri, 22 May 2026 16:17:19 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Guopeng Zhang Cc: Shuah Khan , Tejun Heo , Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Oscar Salvador , David Hildenbrand , cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH] selftests/cgroup: enable memory controller in hugetlb memcg test Message-ID: References: <20260520093130.490020-1-zhangguopeng@kylinos.cn> Precedence: bulk X-Mailing-List: cgroups@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="4ioeyy53bhh73ifv" Content-Disposition: inline In-Reply-To: <20260520093130.490020-1-zhangguopeng@kylinos.cn> --4ioeyy53bhh73ifv Content-Type: text/plain; protected-headers=v1; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: [PATCH] selftests/cgroup: enable memory controller in hugetlb memcg test MIME-Version: 1.0 On Wed, May 20, 2026 at 05:31:30PM +0800, Guopeng Zhang wrote: > test_hugetlb_memcg creates a child cgroup and then writes memory.max and > memory.swap.max. When the test is run standalone, the memory controller > may not be enabled in the test root cgroup's subtree_control. >=20 > In that case, the child cgroup is created without the memory control > files, and the test fails during setup before reaching the hugetlb memcg > accounting checks. >=20 > Skip the test when the memory controller is unavailable. Otherwise, enable > it in subtree_control before creating the test cgroup. Makes sense. > Signed-off-by: Guopeng Zhang > --- > Tested with a cgroup namespace where memory is available in > cgroup.controllers but not enabled in cgroup.subtree_control: >=20 > before: test_hugetlb_memcg failed with "fail to set cgroup memory limit" > after: test_hugetlb_memcg passed and cgroup.subtree_control contained = memory >=20 > tools/testing/selftests/cgroup/test_hugetlb_memcg.c | 8 ++++++++ > 1 file changed, 8 insertions(+) Acked-by: Michal Koutn=FD --4ioeyy53bhh73ifv Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iJEEABYKADkWIQRCE24Fn/AcRjnLivR+PQLnlNv4CAUCahBlahsUgAAAAAAEAA5t YW51MiwyLjUrMS4xMiwyLDIACgkQfj0C55Tb+Aj5lgD+KS03JEmXK2JC8snPY5sv PAmo66NuwBsqgnP9kOfQ8ZcA/2IFpR2fC0yXtbS+OysEn2k3bmEuzcNLcjI0lbRg ndEG =yptN -----END PGP SIGNATURE----- --4ioeyy53bhh73ifv--