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Mon, 14 Apr 2025 06:46:41 -0700 (PDT) Received: from blackdock.suse.cz ([193.86.92.181]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-39eae964073sm11003797f8f.9.2025.04.14.06.46.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 14 Apr 2025 06:46:40 -0700 (PDT) Date: Mon, 14 Apr 2025 15:46:39 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Naresh Kamboju Cc: Cgroups , linux-mm , "open list:KERNEL SELFTEST FRAMEWORK" , open list Subject: Re: selftests: cgroup: Failures =?utf-8?B?4oCTIFRpbWVvdXQ=?= =?utf-8?Q?s?= & OOM Issues Analysis Message-ID: References: MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="fizx46gpbadiqwbn" Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 2C2EA2000B X-Stat-Signature: r3twusbqugajtg5i6uam1z5pbqqxioai X-HE-Tag: 1744638402-306328 X-HE-Meta: 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 egkLJ8+j 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.167392, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: --fizx46gpbadiqwbn Content-Type: text/plain; protected-headers=v1; charset=iso-8859-1 Content-Disposition: inline Content-Transfer-Encoding: quoted-printable Subject: Re: selftests: cgroup: Failures =?utf-8?B?4oCTIFRpbWVvdXQ=?= =?utf-8?Q?s?= & OOM Issues Analysis MIME-Version: 1.0 -Cc: non-lists On Tue, Mar 04, 2025 at 03:20:58PM +0100, Michal Koutn=FD wrote: > Actually, I noticed test_memcontrol failure yesterday (with ~mainline > kernel) but I remember they used to work also rather recently. I haven't > got time to look into that but at least that one may be a regression (in > code or test). So I'm seeing (with v6.15-rc1): | not ok 1 test_kmem_basic | ok 2 test_kmem_memcg_deletion | ok 3 test_kmem_proc_kpagecgroup | ok 4 test_kmem_kernel_stacks | not ok 5 test_kmem_dead_cgroups | memory.current 8130560 [ <- 1 vCPU ] 13168640 | percpu 5040000 [ 4 vCPUs ->] 10080000 | not ok 6 test_percpu_basic not ok 1 By a quick look I suspect that negative dentries that are used to boost memory consumption aren't enough (since some kernel changes, test assumes at least 10B/dentry) -- presumably inappropriate test in new dentry environment, not memcg bug proper. not ok 5 A dying memcg pinned by something indefinitely, didn't look deeper into that. Little suspicious. not ok 6 That looks like the test doesn't take into account non-percpu allocations of memcg (e.g. struct memcg alone is a ~2KiB + struct mem_cgroup_per_node). The test needs better boundaries, not a memcg bug. HTH, Michal --fizx46gpbadiqwbn Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTd6mfF2PbEZnpdoAkt3Wney77BSQUCZ/0RuwAKCRAt3Wney77B Sc+pAP412kL5nkQoVTj/EjRpsQ3CL25ZXx8zZHkVMnZ7lD/g3wD9EHcWYJeFLZb6 r0VcjFMxyJImX15b+E8/MMBxAw9JMwA= =f7Jk -----END PGP SIGNATURE----- --fizx46gpbadiqwbn--