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Wed, 23 Apr 2025 09:49:40 -0700 (PDT) Received: from blackdock.suse.cz ([193.86.92.181]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5f625549cc7sm8007048a12.3.2025.04.23.09.49.40 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 23 Apr 2025 09:49:40 -0700 (PDT) Date: Wed, 23 Apr 2025 18:49:36 +0200 From: Michal =?utf-8?Q?Koutn=C3=BD?= To: Waiman Long Cc: Johannes Weiner , Michal Hocko , Roman Gushchin , Shakeel Butt , Muchun Song , Andrew Morton , Tejun Heo , Shuah Khan , linux-kernel@vger.kernel.org, cgroups@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org Subject: Re: [PATCH v7 1/2] selftests: memcg: Allow low event with no memory.low and memory_recursiveprot on Message-ID: References: <20250415210415.13414-1-longman@redhat.com> <20250415210415.13414-2-longman@redhat.com> <0033f39f-ff47-4645-9b1e-f19ff39233e7@redhat.com> MIME-Version: 1.0 Content-Type: multipart/signed; micalg=pgp-sha512; protocol="application/pgp-signature"; boundary="anb7crrm3nolrfjp" Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 63335C0008 X-Stat-Signature: 46bhx769yopcpcy6ueq58g48cd7pgnwf X-HE-Tag: 1745426982-894121 X-HE-Meta: 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 nviC8WL8 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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: --anb7crrm3nolrfjp Content-Type: text/plain; protected-headers=v1; charset=us-ascii Content-Disposition: inline Subject: Re: [PATCH v7 1/2] selftests: memcg: Allow low event with no memory.low and memory_recursiveprot on MIME-Version: 1.0 On Tue, Apr 22, 2025 at 07:58:56PM -0400, Waiman Long wrote: > Am I correct to assume that the purpose of 1d09069f5313f ("selftests: > memcg: expect no low events in unprotected sibling") is to force a > failure in the test_memcg_low test to force a change in the current > behavior? Or was it the case that it didn't fail when you submit your > patch? Yes, the failure had been intended to mark unexpected mode of reclaim (there's still a reproducer somewhere in the references). However, I learnt that: a) it ain't easy to fix, b) the only occurence of the troublesome behavior was in the test and never reported by users in real life. I've started to prefer the variant where the particular check is indefinite since that. HTH, Michal --anb7crrm3nolrfjp Content-Type: application/pgp-signature; name="signature.asc" -----BEGIN PGP SIGNATURE----- iHUEABYKAB0WIQTd6mfF2PbEZnpdoAkt3Wney77BSQUCaAkaHgAKCRAt3Wney77B SQzZAQCIfMkqhFvSUMRJRs1nSND5RQHJzEcUbEd4lZSX5UqoYQEAty8vhN2bhzOm 8ceCcBpCY2lqn5eEbe8xSjLCAE/WZAI= =fQl9 -----END PGP SIGNATURE----- --anb7crrm3nolrfjp--