commit e1cbe236013c82bcf9a156e98d7b47efb89d2674
author Wu Fengguang <fengguang.wu@intel.com> Mon Dec 06 22:34:29 2010 -0600
committer Wu Fengguang <fengguang.wu@intel.com> Sat Jul 09 22:09:03 2011 -0700
tree c2f1764a3d07fd01fdbe6fd7d6ecd647557808d5
parent ffd1f609ab10532e8137b4b981fdf903ef4d0b32

writeback: trace global_dirty_state

Add trace event balance_dirty_state for showing the global dirty page
counts and thresholds at each global_dirty_limits() invocation.  This
will cover the callers throttle_vm_writeout(), over_bground_thresh()
and each balance_dirty_pages() loop.

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 798842a..f9d9f54 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -447,6 +447,7 @@
 	}
 	*pbackground = background;
 	*pdirty = dirty;
+	trace_global_dirty_state(background, dirty);
 }
 
 /**