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Wed, 16 Sep 2026 06:45:59 -0700 (PDT) Date: Wed, 16 Sep 2026 15:45:58 +0200 From: Michal Hocko To: "David Hildenbrand (Arm)" Cc: Kyle Meyer , akpm@linux-foundation.org, corbet@lwn.net, linmiaohe@huawei.com, shuah@kernel.org, tony.luck@intel.com, jane.chu@oracle.com, jiaqiyan@google.com, Liam.Howlett@oracle.com, bp@alien8.de, hannes@cmpxchg.org, jack@suse.cz, joel.granados@kernel.org, laoar.shao@gmail.com, lorenzo.stoakes@oracle.com, mclapinski@google.com, nao.horiguchi@gmail.com, osalvador@suse.de, rafael.j.wysocki@intel.com, rppt@kernel.org, russ.anderson@hpe.com, shawn.fan@intel.com, surenb@google.com, vbabka@suse.cz, linux-acpi@vger.kernel.org, linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-mm@kvack.org Subject: Re: [PATCH v3] mm/memory-failure: Support disabling soft offline for HugeTLB pages Message-ID: References: <36480c86-fc59-4387-91a4-cad839f502f2@kernel.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <36480c86-fc59-4387-91a4-cad839f502f2@kernel.org> X-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1DD204000E X-Stat-Signature: oiiwp7jq1emgngafs5ghk8qsztdtfpf4 X-Rspam-User: X-HE-Tag: 1789566360-313180 X-HE-Meta: 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 Yat9iACS hfh5Rm1JJ9gq0gWoDFliuETlef2EJOkD3AGvUwygD3EOaFhvv4hUaPNb2V1iP9B3EFJZzzMV6E5ZNMGeeHtFTEtLPqshbYVMb+iZuL09eTjI7TXURtg92a0u9njT7lliVkvZ42Dm95iBnvAIkJEcIsdu5laC9dpFzOCjZoinRR1G90mn8eltXoXWXPN1sNLBZo7VNJFakphLl68cpyQVM1CxU9eXbtQclxpVOTqlaUG/xt3nVUjxj0Q5TOvFQzGep+btxPX5Orqi0KSLBVb6nkxoSARWd2nh0zb09xUQ+wQbZjiit8LFOmm2Uu1IcfWglNd7TrQF9UCElaBnA+gp3WFOeQ2DQAzpJOHbTyqLbHefDdy83Tn+YcnwTWW+T+oJrs3h92+ZNTXkp1G652/CEUa41lbFRbULc1cpxh42wg59ngjN3C0Xgld9eAPoqgFrTnki4LK4A0H0dWQ0Hx0s8yEHDMZ8t9Ajsj/N7 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Wed 16-09-26 15:28:01, David Hildenbrand wrote: > On 9/16/26 15:19, Michal Hocko wrote: > > On Wed 16-09-26 15:08:45, David Hildenbrand wrote: > >> > >>> > >>> OK, so apparently there are some BIOSes which abuse this feature to > >>> mimic a real HW poisoning. This doesn't change the overall picture > >>> though > >> > >> Is this really abusing? We know that a page is shaky and will likely go bad in > >> the future, For now it is still accessible. Trying to migrate off that page stop > >> using it right away sounds pretty logical to me. > > > > Yes, no dispute on that. But we have HW poisoning for exactly that > > purpose, no? > > Well, that tells you that the page content is effectively gone and should be > tried to be recovered / migrated away. Unless I am messing up terminology here. Maybe it is me messing up the terminology... But I guess we have established that whether soft offlining is being abused or not, excluding hugetlb through a configuration is just a wrong thing to do. -- Michal Hocko SUSE Labs