Hi Tejun, On Thu, Apr 26, 2018 at 12:01:18PM -0700, Tejun Heo wrote: > Hello, > > On Fri, Apr 20, 2018 at 06:06:01PM +0800, Benlong Zhang wrote: > > One problem with cgwb is how fs should treat metadata bios. > > For example in xfs, the log might be partially stuck in one > > group, leaving threads in other groups waiting for too long. > > Please refer to the linux-xfs discussion: > > "[PATCH V2] xfs: implement cgroup writeback support" > > > > One approach is to correctly tag bio->bi_css from within the > > filesystems (for xfs log should be blkcg_root), and the other > > is to skip them, but relies on REQ_META being set. > > > > It works with xfs on a cgwb porting implementation to 3.10.0. > > But really not sure about other filesystems... > > Yeah, Josef (cc'd) is working on a similar approach but in a more > generic way. Good to know and looking forward to the code. Thank you for your reply! Benlong > > Thanks. > > -- > tejun
