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Wed, 16 Sep 2026 06:19:44 -0700 (PDT) Date: Wed, 16 Sep 2026 15:19:43 +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: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspam-User: X-Rspamd-Queue-Id: F19E016000D X-Stat-Signature: ra8dgyxh5jxwg4y714fszcowgc45z183 X-Rspamd-Server: rspam01 X-HE-Tag: 1789564785-128575 X-HE-Meta: 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 I9+Cxyw4 LgDKtoqgi0vcw8/nnSYzu7Lh3dJveGjNmTTRMiyxgaDK7LuFnbik+iXkmRuJtovMj2M2r/ytYQMgWAqEQfbW1rAc6GuFr38gWgugdZEGPT1E8IziblxGS+K0InuMjG3Gd3GG1QK8Vcj+7ZN/UM3xfJ882sPFhLO09MCHg3VH1mshrTBbSbrxUoQGQBfFGgdfXkFuFZ8ujDlxAkVoPCZa3DOXtkpXy+WnaU1+V95vSPmx65qnIciS2MPSH5ZrGsqg7A4gWF/cevvofqsWE1YYtMbQg09tdDCy+wvHjadgDprdkLCXt3WlqJwNz82174Yd/mTdkUIHnt/5tFkAMeGctjV2xbS9bnDCgt+QsgGZW7BSNDf4rIF5aaJnyY7I94o0sgox7VFeLyyTdZReXbI/0O6roy5ER7+9yDaNT3usBAWk3EQiWR5WA4D2GBBOVS79zEFk9J4JGE2Dp0TezUkp2oIN8ZyNYDrjepy08 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 15:08:45, 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? > Now, the weird thing is that for hugetlb we wants a different behavior (keep > using the page and ignore the request to evacuate). Exactly -- Michal Hocko SUSE Labs