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charset="us-ascii" Content-Transfer-Encoding: quoted-printable MIME-Version: 1.0 X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-AuthSource: SJ1PR11MB6083.namprd11.prod.outlook.com X-MS-Exchange-CrossTenant-Network-Message-Id: 66f5a474-2a0c-4fc9-6884-08dc9232e858 X-MS-Exchange-CrossTenant-originalarrivaltime: 21 Jun 2024 20:44:12.3684 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: 46c98d88-e344-4ed4-8496-4ed7712e255d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-CrossTenant-userprincipalname: QWCjMKQspYERD2KS8Gk8FlGAfwv4lFvrM1PVRsydNsVJ1XPCBk2pDVEFlde0hdbhmHigy3cYvnC6paWugwR2Sw== X-MS-Exchange-Transport-CrossTenantHeadersStamped: PH7PR11MB8276 X-OriginatorOrg: intel.com X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 36A5A80017 X-Stat-Signature: ssepr4m7buu4rnknue9or8fbhfatryrs X-HE-Tag: 1719002657-443586 X-HE-Meta: U2FsdGVkX1+ahK5MdpA+TvGQu+elqWR1upSHXCHq+bV2rmETXXQXLjMQGEOkGtGU+eBr+ZDS88AR0VVXHHOc7kU+vWWBrtvWVhfvB/BnhESVKgx6M/Br0vSReIMXyHixaNGm6Cdglf2V3X6uOu2XtKeRDFWDk2bADE3zAWjtMoifQELnK3nCj7qg6oapvcVcmBimOFMvES/EYuvnRR98YJsKYNLf2PB2Ujn4eoLZX9dsKJjgPA6bLFBCHYx2K9wSza1Xn5qs02e1UnV8abSDwn0wCUudMS6/qFImgZA/81tT6XxjcT4hBXMvdjyo9hS5PoogQviWXNVli/q59cCqbaCg5pYP4g66W7rQOmACU0lNCP+naXWOI/0inIEVTDggy18tt5CIAyLOgUZfCCb6cSzdLADwGIIjmlDXzRmW9OJqPSkxghGY3XnR/VZfd/tpLPUcgvRH2ZHOtUb6Bvkcl5uohBPNl7L0fUuRsgqvl8qwkwZacSXpX+497ezeO8ySjTnXVbHy+hOW9l4/M0bnj5ZdVqHZe0jNFpAH4c7jmc/fwnovHvGKKZR2fdHx4cVIWuP/zHlTktphzfjY2umO9vUFmt7/MlvMXpN0n1FfP9j2PsJQLnbb0iTdHQ2P93tTQVpvVDtePghlzvCsTSQLkD860TqVqr186QVo8dEELs6eNuhwjrUbj52W50o1bz39ztCRndGWulqD1+GCSlOkPrGTqHJSzjPc2NOfP7wd3HZO/HvkO++FS93TY0MrV2g2U6yVm3c4+v1StUQL6pFReSfCNC2Vi+2NEaRMO4npu/+8B8T+U7P7tIkr/0xhLJDlHE65eXQus21XHD5aVnsEOdMHYeSpR7lEIp7V3sPwrI7XAG/GNYFLt0B1Tb6q4vij+dG4HtHKCtOd8/Cy1D7rW4Ekm/s0GIYOjpfEItwBewyN8PX+aozV1grzyhyonh8htccdb3Jrgdf+m0CJcpE e885Npol Q20wdpIyE7c59823yyNlel4bDhQKArT9R/J5wmi18CwYEYqxYGaFWUHrkGw7GEVTyjiLAgLNPLmXF0LX2WiJnx8mwvzlRnMGa+bSmRGh+VlgVluUGpxxMsRZ7KkXgQN+og3eklPUehpjYth2QxFfIIHIy0v6WgWNt6PXCmkY4r55zebbLYAdX+k7KRqfsSYosaBGb8OZ0tgTt0/VfSCiQbrKyC5B7IRcBjz4w/6OnCKe3hj2jkAZp3sNuMK/NA+Xi1ER2ybmv7vgLa+uxCShkYwxQev2wxvFC2bKpXatM9GqOCoc4h3E3TyNg9Qcg9opwCdQKFH3+fPkwbewgQS3zc1a2JaC3JzJVGQcM5gGlDiDkjr33W8dredjvzXr9HcS+5lzWrQ3FpSkugo1aSFbmNcYpur3Cz2UGGa/ZkdPNteiltEm/1Fk/Dikw3w== X-Bogosity: Ham, tests=bogofilter, spamicity=0.000121, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: > So who actually cares about recovering poisoned volatile memory? > I'd like to understand more on how significant a use case this is. > Whilst I can conjecture that its an extreme case of wanting to avoid > loosing the ability to create 1GiB or larger pages due to poison > is that a real problem for anyone today? Note this is just the case > where you've reached an actual uncorrectable error and probably > / possibly killed something, not the more common soft offlining > of memory due to correctable errors being detected. I guess you really need a reply from someone with a data center with thousands of machines, since that's where this question may be important. My humble opinion is that, outside of the huge page issue, nobody should try to recover a poisoned page. Systems that can report and recover from poison have tens, hundreds, or more GBytes of memory. Dropping 4K pages will not have any measurable impact on a system (even if there are hundreds of pages dropped). There's no reliable way to determine whether the poisoned page was due to some transient issue, or a permanent defect. Recovering a poisoned page runs the risk that the poison will re-occur. Perhaps next use of the page will be in some unrecoverable (kernel) context. So recovery has some risk, but very little upside benefit. -Tony