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Mon, 10 Nov 2025 08:57:41 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id l8VxCAWpEWlzSwAAD6G6ig (envelope-from ); Mon, 10 Nov 2025 08:57:41 +0000 Message-ID: Date: Mon, 10 Nov 2025 09:57:40 +0100 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH] mm: memcg: dump memcg protection info on oom or alloc failures Content-Language: en-US To: Shakeel Butt , Andrew Morton Cc: Johannes Weiner , Michal Hocko , Roman Gushchin , Muchun Song , David Rientjes , linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kernel@vger.kernel.org, Meta kernel team References: <20251107234041.3632644-1-shakeel.butt@linux.dev> From: Vlastimil Babka Autocrypt: addr=vbabka@suse.cz; keydata= xsFNBFZdmxYBEADsw/SiUSjB0dM+vSh95UkgcHjzEVBlby/Fg+g42O7LAEkCYXi/vvq31JTB KxRWDHX0R2tgpFDXHnzZcQywawu8eSq0LxzxFNYMvtB7sV1pxYwej2qx9B75qW2plBs+7+YB 87tMFA+u+L4Z5xAzIimfLD5EKC56kJ1CsXlM8S/LHcmdD9Ctkn3trYDNnat0eoAcfPIP2OZ+ 9oe9IF/R28zmh0ifLXyJQQz5ofdj4bPf8ecEW0rhcqHfTD8k4yK0xxt3xW+6Exqp9n9bydiy tcSAw/TahjW6yrA+6JhSBv1v2tIm+itQc073zjSX8OFL51qQVzRFr7H2UQG33lw2QrvHRXqD Ot7ViKam7v0Ho9wEWiQOOZlHItOOXFphWb2yq3nzrKe45oWoSgkxKb97MVsQ+q2SYjJRBBH4 8qKhphADYxkIP6yut/eaj9ImvRUZZRi0DTc8xfnvHGTjKbJzC2xpFcY0DQbZzuwsIZ8OPJCc LM4S7mT25NE5kUTG/TKQCk922vRdGVMoLA7dIQrgXnRXtyT61sg8PG4wcfOnuWf8577aXP1x 6mzw3/jh3F+oSBHb/GcLC7mvWreJifUL2gEdssGfXhGWBo6zLS3qhgtwjay0Jl+kza1lo+Cv BB2T79D4WGdDuVa4eOrQ02TxqGN7G0Biz5ZLRSFzQSQwLn8fbwARAQABzSBWbGFzdGltaWwg QmFia2EgPHZiYWJrYUBzdXNlLmN6PsLBlAQTAQoAPgIbAwULCQgHAwUVCgkICwUWAgMBAAIe AQIXgBYhBKlA1DSZLC6OmRA9UCJPp+fMgqZkBQJnyBr8BQka0IFQAAoJECJPp+fMgqZkqmMQ AIbGN95ptUMUvo6aAdhxaOCHXp1DfIBuIOK/zpx8ylY4pOwu3GRe4dQ8u4XS9gaZ96Gj4bC+ jwWcSmn+TjtKW3rH1dRKopvC07tSJIGGVyw7ieV/5cbFffA8NL0ILowzVg8w1ipnz1VTkWDr 2zcfslxJsJ6vhXw5/npcY0ldeC1E8f6UUoa4eyoskd70vO0wOAoGd02ZkJoox3F5ODM0kjHu Y97VLOa3GG66lh+ZEelVZEujHfKceCw9G3PMvEzyLFbXvSOigZQMdKzQ8D/OChwqig8wFBmV QCPS4yDdmZP3oeDHRjJ9jvMUKoYODiNKsl2F+xXwyRM2qoKRqFlhCn4usVd1+wmv9iLV8nPs 2Db1ZIa49fJet3Sk3PN4bV1rAPuWvtbuTBN39Q/6MgkLTYHb84HyFKw14Rqe5YorrBLbF3rl M51Dpf6Egu1yTJDHCTEwePWug4XI11FT8lK0LNnHNpbhTCYRjX73iWOnFraJNcURld1jL1nV r/LRD+/e2gNtSTPK0Qkon6HcOBZnxRoqtazTU6YQRmGlT0v+rukj/cn5sToYibWLn+RoV1CE Qj6tApOiHBkpEsCzHGu+iDQ1WT0Idtdynst738f/uCeCMkdRu4WMZjteQaqvARFwCy3P/jpK uvzMtves5HvZw33ZwOtMCgbpce00DaET4y/UzsBNBFsZNTUBCACfQfpSsWJZyi+SHoRdVyX5 J6rI7okc4+b571a7RXD5UhS9dlVRVVAtrU9ANSLqPTQKGVxHrqD39XSw8hxK61pw8p90pg4G /N3iuWEvyt+t0SxDDkClnGsDyRhlUyEWYFEoBrrCizbmahOUwqkJbNMfzj5Y7n7OIJOxNRkB IBOjPdF26dMP69BwePQao1M8Acrrex9sAHYjQGyVmReRjVEtv9iG4DoTsnIR3amKVk6si4Ea X/mrapJqSCcBUVYUFH8M7bsm4CSxier5ofy8jTEa/CfvkqpKThTMCQPNZKY7hke5qEq1CBk2 wxhX48ZrJEFf1v3NuV3OimgsF2odzieNABEBAAHCwXwEGAEKACYCGwwWIQSpQNQ0mSwujpkQ PVAiT6fnzIKmZAUCZ8gcVAUJFhTonwAKCRAiT6fnzIKmZLY8D/9uo3Ut9yi2YCuASWxr7QQZ lJCViArjymbxYB5NdOeC50/0gnhK4pgdHlE2MdwF6o34x7TPFGpjNFvycZqccSQPJ/gibwNA zx3q9vJT4Vw+YbiyS53iSBLXMweeVV1Jd9IjAoL+EqB0cbxoFXvnjkvP1foiiF5r73jCd4PR rD+GoX5BZ7AZmFYmuJYBm28STM2NA6LhT0X+2su16f/HtummENKcMwom0hNu3MBNPUOrujtW khQrWcJNAAsy4yMoJ2Lw51T/5X5Hc7jQ9da9fyqu+phqlVtn70qpPvgWy4HRhr25fCAEXZDp xG4RNmTm+pqorHOqhBkI7wA7P/nyPo7ZEc3L+ZkQ37u0nlOyrjbNUniPGxPxv1imVq8IyycG AN5FaFxtiELK22gvudghLJaDiRBhn8/AhXc642/Z/yIpizE2xG4KU4AXzb6C+o7LX/WmmsWP Ly6jamSg6tvrdo4/e87lUedEqCtrp2o1xpn5zongf6cQkaLZKQcBQnPmgHO5OG8+50u88D9I rywqgzTUhHFKKF6/9L/lYtrNcHU8Z6Y4Ju/MLUiNYkmtrGIMnkjKCiRqlRrZE/v5YFHbayRD dJKXobXTtCBYpLJM4ZYRpGZXne/FAtWNe4KbNJJqxMvrTOrnIatPj8NhBVI0RSJRsbilh6TE m6M14QORSWTLRg== In-Reply-To: <20251107234041.3632644-1-shakeel.butt@linux.dev> Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 7bit X-Stat-Signature: n1q85a1dq4byh3aowf74kd5ujzyfjh69 X-Rspam-User: X-Rspamd-Queue-Id: D2BD0180009 X-Rspamd-Server: rspam10 X-HE-Tag: 1762765062-669883 X-HE-Meta: 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 dLmFr2eS 14Ku7vXJ75djkkvF14GBIio+O6nG4l2AjxAoRsLeFTH0cWqi5ew/pe+UrD5mAaW1AgcurNyOFe9UZZyf5PfJFPKDjeXgmF43ZfR3oOFEm0owwUhJTZcZgqFwCNbKly73qXtax2ALjg0iZ5ZnFwVWtvc5auKRThslEgAeLOlSROsExOwPHQAcUSwfknBNnNaFb23dSy4DBYb4AGmtD77xHsvAzn3SefEQaouUmLPKsVNxWDYjg7Bau625CtQ== 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: On 11/8/25 00:40, Shakeel Butt wrote: > Currently kernel dumps memory state on oom and allocation failures. One > of the question usually raised on those dumps is why the kernel has not > reclaimed the reclaimable memory instead of triggering oom. One > potential reason is the usage of memory protection provided by memcg. > So, let's also dump the memory protected by the memcg in such reports to > ease the debugging. > > Signed-off-by: Shakeel Butt Acked-by: Vlastimil Babka