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Thu, 27 Jun 2024 09:06:31 +0800 Message-ID: <99cb1bd4-65bd-4d2e-a51e-b61bdfd5d7ef@huawei.com> Date: Thu, 27 Jun 2024 09:06:31 +0800 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v5 0/6] mm: migrate: support poison recover from migrate folio Content-Language: en-US To: Andrew Morton CC: , Tony Luck , Miaohe Lin , , Matthew Wilcox , David Hildenbrand , Muchun Song , Benjamin LaHaise , , Jiaqi Yan , Hugh Dickins , Vishal Moola , Alistair Popple , Jane Chu , Oscar Salvador , Lance Yang References: <20240626085328.608006-1-wangkefeng.wang@huawei.com> <20240626130427.2124681ea725b306de4d103d@linux-foundation.org> From: Kefeng Wang In-Reply-To: <20240626130427.2124681ea725b306de4d103d@linux-foundation.org> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 7bit X-Originating-IP: [10.174.177.243] X-ClientProxiedBy: dggems705-chm.china.huawei.com (10.3.19.182) To dggpemf100008.china.huawei.com (7.185.36.138) X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 420F040006 X-Stat-Signature: 476tj4qszqueztxue3s7f1qhdm775r8t X-Rspam-User: X-HE-Tag: 1719450396-991388 X-HE-Meta: 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 XsJ1n5VF BDzamJxfR5koQy/IwYi72n1CPpGnYogANiKv+vutvYlL/ft9qwyc79bQMOrEOdOTl4icUfT8m6Cr21dFjpPMADPq6zzNXi/dUzLdD8LbU0ASc1wvcYA/K+l3pEqwqQKtXZ+yJ3VNNwMvF7MzFL8Ob5PlW0v99zffWod0GhTdo0QH4FvRVP3xOoCCo4ZLIM68FzQq7bURDN0duXqVJx252Ziwo0wti4tQNuzAJtHrdysSvFqc2VE0PntdxqMZ+D2Ps8nGQ6npgEX+788ioIwQkreUZFjFgppLNWcFc X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 2024/6/27 4:04, Andrew Morton wrote: > On Wed, 26 Jun 2024 16:53:22 +0800 Kefeng Wang wrote: > >> The folio migration is widely used in kernel, memory compaction, memory >> hotplug, soft offline page, numa balance, memory demote/promotion, etc, >> but once access a poisoned source folio when migrating, the kernel will >> panic. > > Is there some simple fixup which we can prepare for -stable kernels > which will avoid this panic? No simple fixup, and also I don't think this is suitable for the -stable, it should be an enhancement about MC safe copy and as a new feature, not a bugfix. See other poison recovery(CoW on normal/hugetlb page, khugepaged/ksm copy), we don't backport them too.