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Wed, 8 May 2024 17:03:20 +0800 Subject: Re: [PATCH 3/3] mm/memory-failure: send SIGBUS in the event of thp split fail To: Jane Chu , , , , References: <20240501232458.3919593-1-jane.chu@oracle.com> <20240501232458.3919593-4-jane.chu@oracle.com> From: Miaohe Lin Message-ID: <2e51deff-24ca-32d5-dbd2-9077f860723c@huawei.com> Date: Wed, 8 May 2024 17:03:19 +0800 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.6.0 MIME-Version: 1.0 In-Reply-To: <20240501232458.3919593-4-jane.chu@oracle.com> Content-Type: text/plain; charset="utf-8" Content-Language: en-US Content-Transfer-Encoding: 7bit X-Originating-IP: [10.173.135.154] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To canpemm500002.china.huawei.com (7.192.104.244) X-Stat-Signature: by1xru8d1hoxrsi5kpizwhoho5uahknr X-Rspamd-Queue-Id: 8822D40014 X-Rspamd-Server: rspam10 X-Rspam-User: X-HE-Tag: 1715159006-531960 X-HE-Meta: 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 gQAno5jk vTGf6xr7WQJv7AdyNniPYOvt1Ph6oLiG2R9vFll19RYsaOtto2vw1bJ/iX4bFBqE8L5NwaeU2SRPis/2iEZZmBseFJS/yvoCCMkmJBlqs1xwigGM80dex514wuCEVDb/blUSFKfgcq/KZl9jslliQxE/u8iwLK8jjGZuIHkhm8xv4EGXZ0tUGv3mFLMQR3/9TxRDlr8nYrXie5YL8OfO7xXGFglGWPIkvf9PR 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 2024/5/2 7:24, Jane Chu wrote: > When handle hwpoison in a GUP longterm pin'ed thp page, > try_to_split_thp_page() will fail. And at this point, there is little else > the kernel could do except sending a SIGBUS to the user process, thus > give it a chance to recover. It seems the user process will still receive SIGBUS via kill_accessing_process() when (re-)access thp later. So they should have a chance to recover already. Or am I miss something? Thanks. .