>On Thu, Oct 21, 2021 at 07:45:30PM -0700, Andrew Morton wrote: >> On Thu, 21 Oct 2021 13:01:30 +0100 Matthew Wilcox <willy@xxxxxxxxxxxxx> wrote: >> >> > 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. >> >> I added cc:stable to this and tweaked the comment & coding style a bit: > >Definitely improvements on that front. > >I don't know the BDI code particularly well, and the implementation of >bdi_set_min_ratio() confuses me, so I can't say whether the original >patch is clearly correct or not. Thank Andrew Morton for modifying the comment & style. :) Dear Matthew Wilcox. Please tell me about it more? I want to know more, and I want to find a way to improve it. :)
