2 files changed, 12 insertions, 3 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 1c4f3e9b9bc5..984c3b295978 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -1527,6 +1527,7 @@ struct task_struct {
          */
         int nr_dirtied;
         int nr_dirtied_pause;
+        unsigned long dirty_paused_when; /* start of a write-and-pause period */
 
 #ifdef CONFIG_LATENCYTOP
         int latency_record_count;
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 99d1d0decf88..8588a8918023 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -300,12 +300,13 @@ TRACE_EVENT(balance_dirty_pages,
                  unsigned long dirty_ratelimit,
                  unsigned long task_ratelimit,
                  unsigned long dirtied,
+                 unsigned long period,
                  long pause,
                  unsigned long start_time),
 
         TP_ARGS(bdi, thresh, bg_thresh, dirty, bdi_thresh, bdi_dirty,
                 dirty_ratelimit, task_ratelimit,
-                dirtied, pause, start_time),
+                dirtied, period, pause, start_time),
 
         TP_STRUCT__entry(
                 __array(         char,  bdi, 32)
@@ -320,6 +321,8 @@ TRACE_EVENT(balance_dirty_pages,
                 __field(unsigned int,   dirtied_pause)
                 __field(unsigned long,  paused)
                 __field(         long,  pause)
+                __field(unsigned long,  period)
+                __field(         long,  think)
         ),
 
         TP_fast_assign(
@@ -336,6 +339,9 @@ TRACE_EVENT(balance_dirty_pages,
                 __entry->task_ratelimit = KBps(task_ratelimit);
                 __entry->dirtied        = dirtied;
                 __entry->dirtied_pause  = current->nr_dirtied_pause;
+                __entry->think          = current->dirty_paused_when == 0 ? 0 :
+                         (long)(jiffies - current->dirty_paused_when) * 1000/HZ;
+                __entry->period         = period * 1000 / HZ;
                 __entry->pause          = pause * 1000 / HZ;
                 __entry->paused         = (jiffies - start_time) * 1000 / HZ;
         ),
@@ -346,7 +352,7 @@ TRACE_EVENT(balance_dirty_pages,
                   "bdi_setpoint=%lu bdi_dirty=%lu "
                   "dirty_ratelimit=%lu task_ratelimit=%lu "
                   "dirtied=%u dirtied_pause=%u "
-                  "paused=%lu pause=%ld",
+                  "paused=%lu pause=%ld period=%lu think=%ld",
                   __entry->bdi,
                   __entry->limit,
                   __entry->setpoint,
@@ -358,7 +364,9 @@ TRACE_EVENT(balance_dirty_pages,
                   __entry->dirtied,
                   __entry->dirtied_pause,
                   __entry->paused,      /* ms */
-                  __entry->pause        /* ms */
+                  __entry->pause,       /* ms */
+                  __entry->period,      /* ms */
+                  __entry->think        /* ms */
           )
 );