Re: [PATCH] workqueue: Add WQ_SCHED_FIFO

[Tejun Heo]

On Wed, Jan 18, 2023 at 10:22:32AM -0800, Sandeep Dhavale wrote:
> If with the kernel config option, every WQ_HIGHPRI is elevated to
> sched_fifo_low, wouldn't that be kind of defeating the purpose? Having
> another class for even more urgent work is better in my opinion.

I mean, everybody thinks their work items are the most important. Even with
explicit FIFO, you're still gonna have similar problems as people crowd that
flag. If this is a concern, please benchmark with realistic scenarios and
consider other options (e.g. maybe that problematic workqueue doesn't need
to be HIGHPRI or should be split somehow). Right now, I don't think there
are enough justifications for adding another level.

Thanks.

-- 
tejun