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b=iys0hoQvNxPyv8wESrU1CfxLXmoq9WrKRFiR1q+ees7JXBwaj2n3/C8qQ1Bd15T2o CF37ogQyhsmJI6Qh5mQU20iCjwsaRkLFhO086AuAj0s0euAFqTp5cZZ87IGz355Fl6 ULSd3TUYTyhuXxjR9w/ZZzX36uqKtsaTYTiVia+W3Dv3wd0JNS1+XwMhjxblt7W8m2 +SjT5lRat2kTufiGMeJF33jz+juHeo3RegrqxwY7yH66TzPZ8VcyZyJcWeStyM3YPE ozjEQqjYypddUu1UannWOXsNZ78JqHgatubSnIdz4jCDcQwPZBGGk+Stci0nzGQbZq GAVDOvFO+1xIQ== Message-ID: <9a36d20b-ae48-49a2-807e-28e5e1461974@kernel.org> Date: Thu, 24 Sep 2026 13:23:11 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [Invitation] Linux MM Alignment Session on Hwpoison on Wednesday To: Kiryl Shutsemau Cc: Harry Yoo , David Rientjes , Amit Shah , Andrew Morton , Aneesh Kumar , Christoph Lameter , Dave Hansen , Davidlohr Bueso , Hugh Dickins , Johannes Weiner , John Hubbard , 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> <42221bdb-44f9-4c86-a572-1d1372026836@kernel.org> <6c79bc6c-abb7-407d-84cb-c9ab29732646@kernel.org> 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-Rspamd-Server: rspam05 X-Rspamd-Queue-Id: 1B56D20002 X-Stat-Signature: k59csbf4kj4ybutscgb6rmoxgmb3berm X-Rspam-User: X-HE-Tag: 1790249006-53363 X-HE-Meta: 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 k2/lfdCm 9xxdjqUDWMN0XJtlSmtwRfZ0Txcyi9wrTVuEdkZ+DjSqfCgTjiSNBZyyAjVYLka2h9dzTfdrcaGfl6us0nkv0itJb/w+o7wGZtfPGylTNMKBqp5Dhr1Cz77YAVKrBiC0dd262w4lXnO6l6BAWkWQeHmFENj5DSvwubkFmknA5NyFEcjOp6TtTpmQR3xKIRHJyiejmDYT8zTa5yi8qsVOGX8KcY1m7Z/5PaBbr133Sk6a99RHKt+XAXeIm8rFNncYs71ni0Sm4tUzNl9GqgDIEM8GzXcXq3SN6QZE7kuqgC8gkXV+dE87U4UhapNR7f/nKmBufxaN8Yy92lC6MTpmRDO2kLw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 9/24/26 13:19, Kiryl Shutsemau wrote: > On Thu, Sep 24, 2026 at 12:55:10PM +0200, David Hildenbrand (Arm) wrote: >> On 9/24/26 12:46, Kiryl Shutsemau wrote: >>> >>> I suggested using a bitmap because ranges are not scalable. Some memory >>> failure modes generate errors repeated across the physical address space >>> (think of a column failure, for instance). It would produce too many >>> ranges to be viable. >> >> These are in 2M granularity. Is that a real problem? > > 2M is arbitrary. We can trade finer granularity for the size of the bitmap. Sure. And if you run into scalability problems you can go to coarse granularity. > >>> We already consult a bitmap in memblock for unaccepted memory. We *can* >>> do the same for poisoned memory. >>> >> >> We can do many things. I don't want it. > > What's wrong with it? The last step on allocation from memblock check if > the memory is poisoned in bitmap. If it is, try again next range, > starting from the next non-poisoned address. See my reply to Breno on the other thread. -- Cheers, David