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authorTejun Heo <tj@kernel.org>2019-06-27 13:39:50 -0700
committerJens Axboe <axboe@kernel.dk>2019-07-10 09:00:57 -0600
commit27b36d8fa81fa8274fb72f4eb1484026f6b6daa8 (patch)
tree3880d0298b096462f409a526bfbd52f7ef7875a8 /fs/fs-writeback.c
parent34e51a5e1a6e939ed7d99c38173821ab86d577f4 (diff)
downloadlinux-27b36d8fa81fa8274fb72f4eb1484026f6b6daa8.tar.bz2
blkcg, writeback: Add wbc->no_cgroup_owner
When writeback IOs are bounced through async layers, the IOs should only be accounted against the wbc from the original bdi writeback to avoid confusing cgroup inode ownership arbitration. Add wbc->no_cgroup_owner to allow disabling wbc cgroup owner accounting. This will be used make btrfs compression work well with cgroup IO control. v2: Renamed from no_wbc_acct to no_cgroup_owner and added comment as per Jan. Reviewed-by: Josef Bacik <josef@toxicpanda.com> Reviewed-by: Jan Kara <jack@suse.cz> Signed-off-by: Tejun Heo <tj@kernel.org> Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/fs-writeback.c')
-rw-r--r--fs/fs-writeback.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/fs/fs-writeback.c b/fs/fs-writeback.c
index 0aef79e934bb..542b02d170f8 100644
--- a/fs/fs-writeback.c
+++ b/fs/fs-writeback.c
@@ -727,7 +727,7 @@ void wbc_account_cgroup_owner(struct writeback_control *wbc, struct page *page,
* behind a slow cgroup. Ultimately, we want pageout() to kick off
* regular writeback instead of writing things out itself.
*/
- if (!wbc->wb)
+ if (!wbc->wb || wbc->no_cgroup_owner)
return;
css = mem_cgroup_css_from_page(page);