Hello, On Sat, Jun 15, 2019 at 11:24:48AM -0700, Tejun Heo wrote: > When a shared kthread needs to issue a bio for a cgroup, doing so > synchronously can lead to priority inversions as the kthread can be > trapped waiting for that cgroup. This patch implements > REQ_CGROUP_PUNT flag which makes submit_bio() punt the actual issuing > to a dedicated per-blkcg work item to avoid such priority inversions. > > This will be used to fix priority inversions in btrfs compression and > should be generally useful as we grow filesystem support for > comprehensive IO control. > > Signed-off-by: Tejun Heo <[email protected]> > Reviewed-by: Josef Bacik <[email protected]> > Cc: Chris Mason <[email protected]>
The blkcg patches, especially this one, need Jens's review. Jens, if you're okay with the changes, please let me know how you want them to be routed. Thanks. -- tejun
