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-rw-r--r--include/trace/events/writeback.h28
-rw-r--r--mm/backing-dev.c5
2 files changed, 33 insertions, 0 deletions
diff --git a/include/trace/events/writeback.h b/include/trace/events/writeback.h
index 0bb01ab2e984..d2b2654606ec 100644
--- a/include/trace/events/writeback.h
+++ b/include/trace/events/writeback.h
@@ -151,6 +151,34 @@ DEFINE_WBC_EVENT(wbc_balance_dirty_written);
DEFINE_WBC_EVENT(wbc_balance_dirty_wait);
DEFINE_WBC_EVENT(wbc_writepage);
+DECLARE_EVENT_CLASS(writeback_congest_waited_template,
+
+ TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),
+
+ TP_ARGS(usec_timeout, usec_delayed),
+
+ TP_STRUCT__entry(
+ __field( unsigned int, usec_timeout )
+ __field( unsigned int, usec_delayed )
+ ),
+
+ TP_fast_assign(
+ __entry->usec_timeout = usec_timeout;
+ __entry->usec_delayed = usec_delayed;
+ ),
+
+ TP_printk("usec_timeout=%u usec_delayed=%u",
+ __entry->usec_timeout,
+ __entry->usec_delayed)
+);
+
+DEFINE_EVENT(writeback_congest_waited_template, writeback_congestion_wait,
+
+ TP_PROTO(unsigned int usec_timeout, unsigned int usec_delayed),
+
+ TP_ARGS(usec_timeout, usec_delayed)
+);
+
#endif /* _TRACE_WRITEBACK_H */
/* This part must be outside protection */
diff --git a/mm/backing-dev.c b/mm/backing-dev.c
index 65d420499a61..55627306abe0 100644
--- a/mm/backing-dev.c
+++ b/mm/backing-dev.c
@@ -764,12 +764,17 @@ EXPORT_SYMBOL(set_bdi_congested);
long congestion_wait(int sync, long timeout)
{
long ret;
+ unsigned long start = jiffies;
DEFINE_WAIT(wait);
wait_queue_head_t *wqh = &congestion_wqh[sync];
prepare_to_wait(wqh, &wait, TASK_UNINTERRUPTIBLE);
ret = io_schedule_timeout(timeout);
finish_wait(wqh, &wait);
+
+ trace_writeback_congestion_wait(jiffies_to_usecs(timeout),
+ jiffies_to_usecs(jiffies - start));
+
return ret;
}
EXPORT_SYMBOL(congestion_wait);