On Mon, Jan 25, 2021 at 09:06:19PM -0800, Darrick J. Wong wrote:

From: Darrick J. Wong <djwong@kernel.org>

When CONFIG_XFS_DEBUG=y, set WQ_SYSFS on all workqueues that we create
so that we (developers) have a means to monitor cpu affinity and whatnot
for background workers.  In the next patchset we'll expose knobs for
some of the workqueues publicly and document it, but not now.

I don't really think this is a very good idea.  If we want something like
this it should be kernel-wide and coordinated with the workqueue 
maintainer, but I'm a little doubtful about the use case.