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Sat, 11 May 2024 15:01:22 +0800 Subject: Re: [PATCH v2 1/5] mm/memory-failure: try to send SIGBUS even if unmap failed To: Jane Chu , , , , , References: <20240510062602.901510-1-jane.chu@oracle.com> <20240510062602.901510-2-jane.chu@oracle.com> From: Miaohe Lin Message-ID: <1c03e22a-2f8e-5bfb-1b02-3992fd9173a7@huawei.com> Date: Sat, 11 May 2024 15:01:22 +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: <20240510062602.901510-2-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: dggems705-chm.china.huawei.com (10.3.19.182) To canpemm500002.china.huawei.com (7.192.104.244) X-Rspamd-Queue-Id: 1BB8940013 X-Stat-Signature: dbz4y1hpbwdo3ireex91ug7gww5xhxfx X-Rspam-User: X-Rspamd-Server: rspam11 X-HE-Tag: 1715410886-874773 X-HE-Meta: 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 IequWpYU xEOgpeA3rfP69Lwo6aszgGNGlfaPcXN0UusjjVgzLaASB1qVInOS+5zDJYH/tCbv4dgGslxv8OSw8KP6ZLzahaMte8ZQA8EL1Bz+wADOi09gJ68uJZpm+SZC3V43rLWMbe7E/cAzcbYW29bB0he36Nr+r+P29WWYRvbIe1YNlOyIfgiNTm8/smjU7id3U054EfFTvpF6S1LPjKXWqw3nbRspwmHpxfeIRwayLbkjJ9VCtVC1xI6Xn7izmcw== 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 2024/5/10 14:25, Jane Chu wrote: > For years when it comes down to kill a process due to hwpoison, > a SIGBUS is delivered only if unmap has been successful. > Otherwise, a SIGKILL is delivered. And the reason for that is > to prevent the involved process from accessing the hwpoisoned > page again. > > Since then a lot has changed, a hwpoisoned page is marked and > upon being re-accessed, the memory-failure handler invokes > kill_accessing_process() to kill the process immediately. > So let's take out the '!unmap_success' factor and try to deliver > SIGBUS if possible. > > Signed-off-by: Jane Chu > Reviewed-by: Oscar Salvador LGTM. Thanks. Acked-by: Miaohe Lin Thanks. .