September 13-16, 2022 Dublin, Ireland + Virtual View More Details & Registration Note: The schedule is subject to change.
The Sched app allows you to build your schedule but is not a substitute for your event registration. You must be registered for Open Source Summit Europe 2022 to participate in the sessions. If you have not registered but would like to join us, please go to the event registration page to purchase a registration.
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IMPORTANT NOTE: Timing of sessions and room locations are subject to change.
Lockdep tracks lock acquisition order to detect deadlock, and IRQ and IRQ enable/disable state as well to take accident acquisitions into account. It should be turned off once it detects and reports a deadlock since the data structure and algorithm are not reusable after detection because of the complex design. Waits and their events that are never reachable eventually cause a deadlock. However, Lockdep is only interested in lock acquisition order, forcing to emulate lock acqusition even for waits and events that have nothing to do with real lock. Even worse, no one likes Lockdep's false positive detection because that prevents further one that might be more valuable. Which makes the kernel developers more sensitive to Lockdep's false positives. Besides those, by tracking lock acquisition order, it cannot correctly deal with read lock and cross-event e.g. wait_for_completion()/complete() for deadlock detection. Lockdep is no longer a good tool for the general purpose. Again, waits and their events that are never reachable eventually cause a deadlock. The new solution, Dept(DEPendency Tracker), focuses on waits and events themselves. Dept tracks waits and events and report it once it detects some events are never reachable.
