writeback: update writeback tracepoints to report cgroup

The following tracepoints are updated to report the cgroup used during
cgroup writeback.

* writeback_write_inode[_start]
* writeback_queue
* writeback_exec
* writeback_start
* writeback_written
* writeback_wait
* writeback_nowork
* writeback_wake_background
* wbc_writepage
* writeback_queue_io
* bdi_dirty_ratelimit
* balance_dirty_pages
* writeback_sb_inodes_requeue
* writeback_single_inode[_start]

Note that writeback_bdi_register is separated out from writeback_class
as reporting cgroup doesn't make sense to it.  Tracepoints which take
bdi are updated to take bdi_writeback instead.

Signed-off-by: Tejun Heo <tj@kernel.org>
Suggested-by: Jan Kara <jack@suse.cz>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@fb.com>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 22cddd3e5de8..802beeb6b86b 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -1289,7 +1289,7 @@ static void wb_update_dirty_ratelimit(struct dirty_throttle_control *dtc,
         wb->dirty_ratelimit = max(dirty_ratelimit, 1UL);
         wb->balanced_dirty_ratelimit = balanced_dirty_ratelimit;
 
-        trace_bdi_dirty_ratelimit(wb->bdi, dirty_rate, task_ratelimit);
+        trace_bdi_dirty_ratelimit(wb, dirty_rate, task_ratelimit);
 }
 
 static void __wb_update_bandwidth(struct dirty_throttle_control *gdtc,
@@ -1683,7 +1683,7 @@ static void balance_dirty_pages(struct address_space *mapping,
                  * do a reset, as it may be a light dirtier.
                  */
                 if (pause < min_pause) {
-                        trace_balance_dirty_pages(bdi,
+                        trace_balance_dirty_pages(wb,
                                                   sdtc->thresh,
                                                   sdtc->bg_thresh,
                                                   sdtc->dirty,
@@ -1712,7 +1712,7 @@ static void balance_dirty_pages(struct address_space *mapping,
                 }
 
 pause:
-                trace_balance_dirty_pages(bdi,
+                trace_balance_dirty_pages(wb,
                                           sdtc->thresh,
                                           sdtc->bg_thresh,
                                           sdtc->dirty,