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Registered in England and Wales under Company Registration No. 3798903 From: David Howells To: lsf-pc@lists.linux-foundation.org cc: dhowells@redhat.com, Matthew Wilcox , Kent Overstreet , dwmw2@infradead.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org Subject: [LSF/MM/BPF TOPIC] Replacing TASK_(UN)INTERRUPTIBLE with regions of uninterruptibility MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-ID: <2701317.1706863882.1@warthog.procyon.org.uk> Date: Fri, 02 Feb 2024 08:51:22 +0000 Message-ID: <2701318.1706863882@warthog.procyon.org.uk> X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.6 X-Rspamd-Queue-Id: 5BCA5120007 X-Rspam-User: X-Stat-Signature: 9zrot9a17wrj8rfc9rd656ofz7b611sc X-Rspamd-Server: rspam03 X-HE-Tag: 1706863896-537349 X-HE-Meta: U2FsdGVkX1/X966g7Y0iQQu9iv/74jCO/HX4y/ZrElhY+eG/dlOj8Qu/iEW5v+Gm7j2jRSGOvcTkZxrMw6MD4PbZ4lK2JZjeKd3OcKUdsPp/ofQST2ehWKARv50zEID5/8g+DYIVwR/1N6uJHB1Ob45EHGuI29ecXzp6c+9C05tYk1p2sy3GI096helSWfGyyT4maT5Eq+TukRzu+k6j5HkoxuQLNCz0TI+Aaf/QbgQ29khBxeol2oPWb8zV/UWV5SSAw33fOXWnPSz7b7G0PwlEzNeZYvfVrWJJtHAPwaoGKqWi8jsmTINkXXaFK+yR8W0MO5twM4oUS4gM3wSDQ9575H0xEv7vSZ7HmyBBzNNzldhYAh7UlE02gxv5Wyr7b97z0AVKgwreWwO352ZoHoQqvEkL3omc08YWKwPH0MJM3e/Qaoxy47TF1CUfepG2Zp5yS7Hl8W+NW1sxWnmXJoOL3pp/8OHaORe6u7kTp93vygbtkB2keetpzX4ViJ6Gq/Y/BJx9BHanjG5Zkwj0wUYF1UmBVE362fgpr1wEuT0q0ElLyafKNXNMU2viY8m5v8kdbIq6Iu35dnbEhrDwjt8iq2UTePUVSqV3P52qr/4lgrKXhPdAbKd2zNpkHjP3LDvevUjIgYNoLCDeoL1Bwop8kEaQDS7EJiyU6csgUBaDLZBt7hR9bBr7U98F96ueDLrbnJ5Qgu19RahYqXyge08fFaRncCRaqXsAvJELqYLRpdzDA131TQlkrY2ShKnUJcyQj5PgAOTX6GVSi2Gj6wypM1q64cZjXSf+l6vfixKdIT0QahoGh6TYWtCitmFKz8oiNCX28Psc/EubLzwWAtY1sgAvv0mDxTvFYa4pgxb54ofcAr86QIzW+EVob9sYaplbRyZIUh8+n3FRSfXuYxRTS5yAjvNPruwoYFGmvrW9aLaBDj6808BlHF7ZzJUqxMZ6+C5csyARhXzpbGq glNLcV+w HnNKm9AVotGrGdjVL2LESp1BKdPKD9L8L80rUxNKpymv7OqG6554iqPLIVmLdi3opIMVaZEKC0sNnxScE4VXGveYhW7+W+A1e3OAz7ukOL6W5oYGqCxLCVvAFZiPo7ya/Fr4BV6VFN6jrlQCijEm0XPUGoU9/O0uHFvwjzXSyojkdVfQ6DNEJhQ2Df43UFXD9dpEjN2p+P/RIkZA= 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: Hi, We have various locks, mutexes, etc., that are taken on entry to filesystem code, for example, and a bunch of them are taken interruptibly or killably (or ought to be) - but filesystem code might be called into from uninterruptible code, such as the memory allocator, fscache, etc.. Does it make sense to replace TASK_{INTERRUPTIBLE,KILLABLE,UNINTERRUPTIBLE} with begin/end functions that define the area of uninterruptibility? The regions would need to handle being nested, so maybe some sort of counter in the task_struct counter would work. David