Re: [PATCH 1/1] Revert "RDMA/rxe: Add workqueue support for rxe tasks"

[Zhu Yanjun <yanjun.zhu@linux.dev>]

在 2023/10/5 2:38, Jason Gunthorpe 写道:
> On Wed, Oct 04, 2023 at 10:43:20AM -0700, Bart Van Assche wrote:
> 
>> Thank you for having reported this. I'm OK with integrating the
>> above change in my patch. However, code changes must be
>> motivated. Do you perhaps have an explanation of why WQ_HIGHPRI
>> makes the issue disappear that you observed?
> 
> I think it is clear there are locking bugs in all this, so it is not
> surprising that changing the scheduling behavior can make locking bugs
> hide
> 
> Jason

With the flag WQ_HIGHPRI, an ordered workqueue with high priority is 
allocated. With this workqueue, to now, the test has run for several 
days. And the problem did not appear. So to my test environment, this 
problem seems fixed with the above commit.

I doubt, without the flag WQ_HIGHPRI, the workqueue is allocated with 
normal priority. The work item in this workqueue is more likely 
preempted than high priority work queue.

Best Regards,
Zhu Yanjun