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To: Muchun Song , Shakeel Butt Cc: Johannes Weiner , Hamza Mahfooz , linux-mm@kvack.org, Roman Gushchin , Andrew Morton , cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Tejun Heo , =?UTF-8?Q?Michal_Koutn=C3=BD?= , Michal Hocko , Allen Pais , Yosry Ahmed References: <20250205180842.GC1183495@cmpxchg.org> <7nqk5crpp7wi65745uiqgpvlomy3cyg3oaimaoz4fg2h4mf7jp@zclymjsovknp> <91D2E468-B89A-4DD7-B1B0-B892FA4482E3@linux.dev> Content-Language: en-US From: Kamalesh Babulal In-Reply-To: <91D2E468-B89A-4DD7-B1B0-B892FA4482E3@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-ClientProxiedBy: SG2PR01CA0194.apcprd01.prod.exchangelabs.com (2603:1096:4:189::22) To SA2PR10MB4777.namprd10.prod.outlook.com (2603:10b6:806:116::5) MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: SA2PR10MB4777:EE_|DM4PR10MB7474:EE_ X-MS-Office365-Filtering-Correlation-Id: 905ed7c7-b10b-40c1-1752-08dd46c61aa6 X-MS-Exchange-SenderADCheck: 1 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 +PxzMQer y6GaXoUwkoQlmYeXhBAqRAOX9LWKgjqAeLB036dnvRwl4zBwmvHVUg2saq9WCOWcbs0zphiqYvEFWq7AbCFuEwQqcrGLH8Q1JvmPIYWkYOKxpM9eL0WT+cvQcTjSMYIlajeOaYtPT8xCqzSOxL/CVoAiNsAAVKuYvf8LUJNWkIL14JHac7IWwww736qu23tP+c2vpYxaGG/IlpC5UavGivmdfeE6WnafAmAD2eeSbRl3lwQyegNiGg1NJ+WcVErq7gUovAWEmUA6YjI3lNDWkU41uUxwNDvAF//K4XJuEJpMbYkI6YCoJZX5qYwk9NxX+uMRwDJ1aVN1djhdSUZAoFe0sYkT/2LBp3fSUiOUrmKmVkcowTynp95LhjSsN/+Sd4MW7zvWFjm/l/LZV0RcuZrl87fgx5+QXsugieQ61yPSWOOOvdkgh3z5ijiUh3OdSdmpf84adxLnU5hu3Fzj74vU9RyZDYjmfamk1Hp1859HusT4N2MtReEDyNDarv6s+Ze/ULbxSWAmlWfhXaDPwj1HFE0SwcWs/nos/FHB0+QnjRF3u7nLj2ba2pGh7q71nOp0ii3aLb4dhghnA6yXn8Z0LuGSBDyMr9e7tF73cCMVqQPwJQ7zDFy2QuM/qmMUKCq11IH4mdDq9XAs= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000005, 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 06/02/25 09:00, Muchun Song wrote: > > >> On Feb 6, 2025, at 02:46, Shakeel Butt wrote: >> >> On Wed, Feb 05, 2025 at 01:08:42PM -0500, Johannes Weiner wrote: >>> On Wed, Feb 05, 2025 at 12:50:19PM -0500, Hamza Mahfooz wrote: >>>> Cc: Shakeel Butt >>>> >>>> On 2/5/25 12:48, Hamza Mahfooz wrote: >>>>> I was just curious as to what the status of the issue described in [1] >>>>> is. It appears that the last time someone took a stab at it was in [2]. >>> >>> If memory serves, the sticking point was whether pages should indeed >>> be reparented on cgroup death, or whether they could be moved >>> arbitrarily to other cgroups that are still using them. >>> >>> It's a bit unfortunate, because the reparenting patches were tested >>> and reviewed, and the arbitrary recharging was just an idea that >>> ttbomk nobody seriously followed up on afterwards. >>> >>> We also recently removed the charge moving code from cgroup1, along >>> with the subtle page access/locking/accounting rules it imposed on the >>> rest of the MM. I'm doubtful there is much appetite in either camp for >>> bringing this back. >>> >>> So I would still love to see Muchun's patches merged. They fix a >>> seemingly universally experienced operational issue in memcg, and we >>> shouldn't hold it up unless somebody actually posts alternative code. >>> >>> Thoughts? >> >> I think the recharging (or whatever the alternative) can be a followup >> to this. I agree this is a good change. > > I agree with you. We've been encountering dying memory issues for years > on our servers. As Roman said, I need to refresh my patches. So I need > some time for refreshing. > We have seen the dying cgroups issue too and look forward to your patches. Happy to help with testing/reviewing. -- Thanks, Kamalesh