Messages in this thread | | | Date | Tue, 15 Aug 2023 18:15:57 +0200 | From | Peter Zijlstra <> | Subject | Re: [PATCH 0/6] locking/rtmutex: Avoid PI state recursion through sched_submit_work() |
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On Tue, Aug 15, 2023 at 01:01:21PM +0200, Peter Zijlstra wrote: > Hi! > > This is basically the 'same' patches as send earlier by Sebastian here: > > https://lkml.kernel.org/r/20230427111937.2745231-1-bigeasy@linutronix.de > > I spend a number of days trying to invert rtmutex, only to make a giant mess of > things and finally conceded that this is the least horrible approach. > > There's a bunch of naming differences and I added some asserts that should > hopefully avoid things from going sideways without notice. I've also updated > the changelogs to high-light the actual problem. The whole pi_blocked_on > 'corruption' is a mere consequence of the more fundamental problem that the > whole PI state recurses. > > I've not tested this with the rest of the RT patches stuck on, so very limited > actual testing happened. > > If anybody could please confirm stuff still works as advertised, I'll go queue > this mess and we can hopefully forget all about it. >
N/m - 0day found a problem. Futex-PI trips the rt_mutex_schedule() assertion for not passing through rt_mutex_pre_schedule().
I'll go try and untangle that...
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