commit b48c104d2211b0ac881a71f5f76a3816225f8111
author Wu Fengguang <fengguang.wu@intel.com> Wed Mar 02 17:22:49 2011 -0600
committer Wu Fengguang <fengguang.wu@intel.com> Mon Oct 31 00:29:21 2011 +0800
tree b947f3fd4c8b49ee12d516f3eb520209c577387b
parent 50657fc4dfa7e345a1008f7c1de0bf930bbecca9

writeback: trace event bdi_dirty_ratelimit

It helps understand how various throttle bandwidths are updated.

Signed-off-by: Wu Fengguang <fengguang.wu@intel.com>

mm/page-writeback.c

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index 0802d51..e3c2d8b 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -875,6 +875,8 @@
 
 	bdi->dirty_ratelimit = max(dirty_ratelimit, 1UL);
 	bdi->balanced_dirty_ratelimit = balanced_dirty_ratelimit;
+
+	trace_bdi_dirty_ratelimit(bdi, dirty_rate, task_ratelimit);
 }
 
 void __bdi_update_bandwidth(struct backing_dev_info *bdi,