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Fri, 7 Mar 2025 16:07:57 +0800 Message-ID: <46ac83f7-d3e0-b667-7352-d853938c9fc9@huawei.com> Date: Fri, 7 Mar 2025 16:07:57 +0800 MIME-Version: 1.0 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:102.0) Gecko/20100101 Thunderbird/102.15.1 Subject: Re: Using userfaultfd with KVM's async page fault handling causes processes to hung waiting for mmap_lock to be released To: , CC: , , , , References: <79375b71-db2e-3e66-346b-254c90d915e2@cslab.ece.ntua.gr> <20250307072133.3522652-1-tujinjiang@huawei.com> From: Jinjiang Tu In-Reply-To: <20250307072133.3522652-1-tujinjiang@huawei.com> Content-Type: text/plain; charset="UTF-8"; format=flowed Content-Transfer-Encoding: 8bit X-Originating-IP: [10.174.179.13] X-ClientProxiedBy: dggems704-chm.china.huawei.com (10.3.19.181) To kwepemo200002.china.huawei.com (7.202.195.209) X-Rspam-User: X-Stat-Signature: gzzs69bzsq51bj5j7wtn8x5uinng11u9 X-Rspamd-Queue-Id: 38473A0018 X-Rspamd-Server: rspam07 X-HE-Tag: 1741334882-210308 X-HE-Meta: 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 Omk1pwjX d8SDNTvch3s9CTXs8JtRlVIEL+3cJ1WLljXDjBfj2/xMe/Ryj30psz0F23nuIAMWrafHlZVeLex2c9PJvW+R6DwdFY+mHdmngIIHsK7eJF1s4DfP0mk90z6AhhERi8bAg6uevFmjBWFww8brGep/pU+8UOP8VObPqxKhfwkKpfMW9uzLBdABqsExo4jOEpQVlrbraBe4VlhhZmuU= X-Bogosity: Ham, tests=bogofilter, spamicity=0.041634, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: cc Peter Xu 在 2025/3/7 15:21, Jinjiang Tu 写道: > Hi, > > I encountered the same issue too. In my scenario, GUP is called by mlockall() > syscall. > > Is there a solution to fix it? > > Thanks. >