On Thu, Jan 14, 2021 at 02:38:49PM -0800, Darrick J. Wong wrote:

There already /is/ a pwork_threads sysctl knob for controlling
quotacheck parallelism; and for the block gc workqueue I add WQ_SYSFS so
that you can set /sys/bus/workqueue/devices/xfs-*/max_active.

Hmm.  A single know that is named to describe that it deals with the
expected device parallelism might be easier to understand for users.