linux-kernel - Re: [sched_ext/for-6.11]: Issue with BPF Scheduler during CPU Hotplug

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Message-ID: <Zru5_UmEmWhNaPyo@slm.duckdns.org>
Date: Tue, 13 Aug 2024 09:54:37 -1000
From: Tejun Heo <tj@...nel.org>
To: Aboorva Devarajan <aboorvad@...ux.ibm.com>
Cc: void@...ifault.com, linux-kernel@...r.kernel.org
Subject: Re: [sched_ext/for-6.11]: Issue with BPF Scheduler during CPU Hotplug

Hello,

On Sat, Aug 10, 2024 at 11:54:24PM +0530, Aboorva Devarajan wrote:
...
> Sorry for the delayed response, I just got sometime on the machine to
> run this test.
> 
> I applied the patchset on the latest sched-ext (for-next) branch and
> tested it, but the issue still persists. I did the test on a PowerPC
> system, as it is easier to reproduce the issue there compared to x86.

Bummer.

...
> I'll see if I can collect more details, and if there's anything else
> you'd want me check, please let me know.

Can you trigger sysrq-t when the system is stuck? Also, can you see whether
the problem is reproducible on x86 w/ the wq changes applied?

Thanks.

-- 
tejun