Messages in this thread | | | From | Ran Wang <> | Subject | RE: [PATCH] [RFC] rt: kernel/sched/core: fix kthread_park() pending too long when CPU un-plugged | Date | Fri, 8 Jan 2021 09:27:25 +0000 |
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Hi Sebastian,
On Friday, January 8, 2021 5:05 PM, Sebastian Siewior wrote: > > On 2021-01-08 08:45:14 [+0000], Ran Wang wrote: > > Hi Sebastian, Peter > Hi, > > > > I had a similar patch in -RT and dropped it in v5.10-rc7-rt16. > > > It was added because RT couldn't boot since creating the boot-threads didn't work before the ksoftirqd was up. This was fixed by commit > > > 26c7295be0c5e ("kthread: Do not preempt current task if it is > > > going to call schedule()") > > > > I tried applying above commit to linux-5.6.y-rt, it could resolve my problem on LX2160ARDB, THANKS! > > so in other words all this could have been avoided by using a supported or maintained RT series. The v5.4 series has this patch, v5.6 isn't > maintained anymore so it is likely that there is more missing.
Thanks for let me know this.
The reason I trying linux-5.6-rt is that I have encountered other more serious issues on later RT version (even with v5.10-rc7-rt16), one of them is CPU hot plug got stuck in irq_work_sync() which called by sugov_stop(), failure happen at 1st loop stress test every time. I will try to collect more information and create another mail thread later.
Thanks & Regards, Ran
> Sebastian
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