Re: [PATCH] workqueue: Add WQ_SCHED_FIFO

From: Sandeep Dhavale <dhavale@google.com>
To: Tejun Heo <tj@kernel.org>
Cc: Nathan Huckleberry <nhuck@google.com>,
	Daeho Jeong <daehojeong@google.com>,
	Eric Biggers <ebiggers@kernel.org>,
	Sami Tolvanen <samitolvanen@google.com>,
	Lai Jiangshan <jiangshanlai@gmail.com>,
	Jonathan Corbet <corbet@lwn.net>,
	linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH] workqueue: Add WQ_SCHED_FIFO
Date: Wed, 18 Jan 2023 10:22:32 -0800	[thread overview]
Message-ID: <CAB=BE-Q9jtJnqPwGzSTQ6-soZ9STvqAebeONy=Eyo08H+eg-rQ@mail.gmail.com> (raw)
In-Reply-To: <Y8gxu7l8BUWewuMg@slm.duckdns.org>

On Wed, Jan 18, 2023 at 9:52 AM Tejun Heo <tj@kernel.org> wrote:
>
> On Sat, Jan 14, 2023 at 01:00:00PM -0800, Nathan Huckleberry wrote:
> > This sounds fine to me. How do you feel about a config flag to change
> > the default WQ_HIGHPRI scheduler policy and a sysfs node to update the
> > policy per workqueue?
>
> Yeah, sounds fine to me.
>
> Thanks.
>
Hi Tejun,
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.

Thanks,
Sandeep.
> --
> tejun