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Mon, 9 Dec 2024 12:34:10 +0000 (UTC) Received: from dovecot-director2.suse.de ([2a07:de40:b281:106:10:150:64:167]) by imap1.dmz-prg2.suse.org with ESMTPSA id foVlF8LjVmcPWwAAD6G6ig (envelope-from ); Mon, 09 Dec 2024 12:34:10 +0000 Received: by quack3.suse.cz (Postfix, from userid 1000) id E859CA0B0C; Mon, 9 Dec 2024 13:34:05 +0100 (CET) Date: Mon, 9 Dec 2024 13:34:05 +0100 From: Jan Kara To: "Aithal, Srikanth" Cc: Klara Modin , Josef Bacik , kernel-team@fb.com, linux-fsdevel@vger.kernel.org, jack@suse.cz, amir73il@gmail.com, brauner@kernel.org, torvalds@linux-foundation.org, viro@zeniv.linux.org.uk, linux-xfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-mm@kvack.org, linux-ext4@vger.kernel.org, Linux-Next Mailing List Subject: Re: [PATCH v8 16/19] fsnotify: generate pre-content permission event on page fault Message-ID: <20241209123405.n7rwqtblqgy5p3bw@quack3> References: <5d0cd660-251c-423a-8828-5b836a5130f9@gmail.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Rspamd-Server: rspam04 X-Rspamd-Queue-Id: 05938C0009 X-Stat-Signature: qp8rm5p465oszhu5i8jbwmana6ew6etd X-Rspam-User: X-HE-Tag: 1733747627-443259 X-HE-Meta: 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 EjmvSHpo lBStWgDmNkFj328ku0SZ2prAjHohDLEZPwyb3/rsWxl6cx3lAVGdq6w8oysCv8H13P6IKPNgUOJdeEhUMn7YsnFLasn4k0a13PqTkmmggbj6mBrFWZpNa3x8R+jrwxsleiBWQioNTu0imii4r9vqu4PaTmh2hqciM2XnKoBOmAta09+nNWQdPHvtUNUa+DoZnsotNpY8H1IaDy+aboYcaSRWNc86v89gfyVedrfoe2fooLt7zWi39r7/ho3D/nM6X6AIXjGbaPKWAT5jtovpTB4iJS2T8VvWZdnXT/4RizB+zsaP5w2FUu0umg3Ws+qPjD5JGZrvTLR8xGw2+YwbndEDC3A9ekILl+Z9uw/lTgH7jpKk= 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 Mon 09-12-24 16:15:32, Aithal, Srikanth wrote: > On 12/8/2024 10:28 PM, Klara Modin wrote: > > Hi, > > > > On 2024-11-15 16:30, Josef Bacik wrote: > > > FS_PRE_ACCESS or FS_PRE_MODIFY will be generated on page fault depending > > > on the faulting method. > > > > > > This pre-content event is meant to be used by hierarchical storage > > > managers that want to fill in the file content on first read access. > > > > > > Export a simple helper that file systems that have their own ->fault() > > > will use, and have a more complicated helper to be do fancy things with > > > in filemap_fault. > > > > > > > This patch (0790303ec869d0fd658a548551972b51ced7390c in next-20241206) > > interacts poorly with some programs which hang and are stuck at 100 % > > sys cpu usage (examples of programs are logrotate and atop with root > > privileges). > > > > I also retested the new version on Jan Kara's for_next branch and it > > behaves the same way. > > From linux-next20241206 onward we started hitting issues where KVM guests > running kernel > next20241206 on AMD platforms fails to shutdown, hangs > forever with below errors: Thanks for report! This was discussed in [1] and I've just pushed out a branch which has this bug fixed. [1] https://lore.kernel.org/all/20241208152520.3559-1-spasswolf@web.de Honza -- Jan Kara SUSE Labs, CR