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b=OYKKX16eY3t1xaXCZTv38418gdMGxdTo9ZtAW/Kg+f8pRevCHjHtOK0VhJEG+UxZQ Hamy6AOqoQ+Z3e2DsJQxZIDhWk+P1jD9YzhnWqSA9cAJ6NfhPRcZGHNPRToTu3sjng OLvyRdio/Y/CAGYTOKdFBJ2DXeyNhCj+D4MZeiSkTMRhhZTJafYAnEAQycArREQ210 9O+YfM3bLFzb76jEYgXNesAWBUEk905Xv6Gi8UkCX5Ezsv7omCIQbJrfUnDoyN6vlY JsXEIFcFdOMizU3Yjnr+gWdG6KtzcR6I3NZTwxNLjddDjeZhW06cev2TYhsSeNLtLE STLNckEd3pR5w== Message-ID: <42221bdb-44f9-4c86-a572-1d1372026836@kernel.org> Date: Wed, 23 Sep 2026 15:37:14 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Invitation] Linux MM Alignment Session on Hwpoison on Wednesday To: Harry Yoo , David Rientjes Cc: Amit Shah , Andrew Morton , Aneesh Kumar , Christoph Lameter , Dave Hansen , Davidlohr Bueso , Hugh Dickins , Johannes Weiner , John Hubbard , Kirill Shutemov , Matthew Wilcox , Mel Gorman , Michal Hocko , Mike Rapoport , Peter Xu , Raghavendra K T , "Rao, Bharata Bhasker" , Rik van Riel , Roman Gushchin , Shakeel Butt , Shivank Garg , Sterling Alexander , Suren Baghdasaryan , Tejun Heo , Vlastimil Babka , Yang Shi , Zi Yan , William Roche , linmiaohe@huawei.com, ljs@kernel.org, osalvador@kernel.org, nao.horiguchi@gmail.com, tony.luck@intel.com, wangkefeng.wang@huawei.com, jane.chu@oracle.com, muchun.song@linux.dev, liam@infradead.org, shuah@kernel.org, boudewijn@delta-utec.com, linux-mm@kvack.org, Breno Leitao References: <45af1b22-49d4-5d60-e7ad-14a1a33c8dc9@google.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 2FE84A000A X-Stat-Signature: 7xropfeywd1j3e4iy1hcp86djent3smo X-HE-Tag: 1790170650-444533 X-HE-Meta: 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 4OAkq2xT 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/23/26 14:57, Harry Yoo wrote: > On Mon, Sep 21, 2026 at 09:26:22AM -0700, David Rientjes wrote: >> Hi everybody, >> >> We host a biweekly series, the Linux MM Alignment Session, on Wednesdays. >> We'd like to invite MM developers to attend and will announce the topic >> for the next instance on the Monday prior to the next meeting. >> >> Our next Linux MM Alignment Session is scheduled for Wednesday. The >> details: >> >> Wednesday, September 23 * 9:00 - 10:00am PDT (UTC-7) >> https://meet.google.com/csb-wcds-xya >> backup: https://tel.meet/csb-wcds-xya?pin=1301132214803 >> doc: >> https://docs.google.com/document/d/1QQfZFPHa-pGEGf4A06cSqS0jdJwuZ8ro9JU5H0YSUQ0/view >> >> This week's topic will be Hwpoison, see the discussion in >> https://marc.info/?l=linux-kernel&m=178796007385067&w=2 >> >> No specific agenda other than to gather core MM developers with hwpoison >> developers and discuss: >> - where validation should live, esp with regard to the page allocator, or >> strict invariants in the page allocator >> + implications for the fastpath >> - handling for folios of arbitary orders >> - handling partial folio poisoning and split failures >> - race conditions between memory_failure() and concurrent >> alloc/free/compaction >> - soft offline for pages in the pcp lists > > [+Cc Breno] > > This might be worth some attention: > > [PATCH v5 0/9] mm/memory-failure: keep hardware-poisoned pages out of the next kexec > https://lore.kernel.org/linux-mm/20260915-hwpoison-kho-v5-0-3bc7a57bd503@debian.org/ > > - The question: How best can we pass information about poisoned pages > across kexec when the kernel accesses a poisoned page, panics and > calls kexec, so that the next kernel avoids hitting the poisoned > pages again? > > One challenge here is introducing another source (a new EFI bitmap > that represents poisoned memory, in addition to existing > PG_hwpoison) of poisoned pages adds complexity and confusion. > > David Hildenbrand suggested that we should simplify this as much > as possible in a way that we don't have two sources of information > w/ inconsistency between them and using memmap as the only source. > > e.g.) By consuming the EFI bitmap only once when initializing > memmap (to propagate poison information to not just free pages > through __free_pages_core(), but to the all pages on memmap). > > Another challenge here is that we don't have functionality > to poison pages early in the boot process before memmap and buddy > are ready. So any allocation before initializing them might still > allocate poisoned pages. I've been thinking some more (and will reply in detail to the series), but I do wonder whether memblock should actually be thought about poisoned ranges and refuse to hand them out (reserved/allocated). So we'd use the bitmap only to feed memblock, but not for anything else later (if possible). -- Cheers, David