On Thu, Oct 21, 2021 at 04:16:52AM -0700, Christoph Hellwig wrote: > On Fri, Oct 22, 2021 at 01:19:43AM +0900, Manjong Lee wrote: > > Because when sdcard is removed, bdi_min_ratio value will remain. > > Currently, the only way to reset bdi_ min_ratio is to reboot. > > But bdis that are unregistered are never re-registered. What is > the problem you're trying to solve? The global bdi_min_ratio needs to be adjusted. See bdi_set_min_ratio() in mm/page-writeback.c.
