path: root/include/trace
diff options
authorPaul E. McKenney <paul.mckenney@linaro.org>2011-11-22 12:13:03 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-12-11 10:31:59 -0800
commit045fb9315a2129023d70a0eecf0942e18fca4fcd (patch)
treeede20a4d4edd1d02362af24131114c93a84b77b1 /include/trace
parent182dd4b277177e8465ad11cd9f85f282946b5578 (diff)
rcu: Update trace_rcu_dyntick() header comment
This commit updates the trace_rcu_dyntick() header comment to reflect events added by commit 4b4f421. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/trace')
1 files changed, 10 insertions, 2 deletions
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index c29fb2f55909..7f6877a35051 100644
--- a/include/trace/events/rcu.h
+++ b/include/trace/events/rcu.h
@@ -241,8 +241,16 @@ TRACE_EVENT(rcu_fqs,
* Tracepoint for dyntick-idle entry/exit events. These take a string
- * as argument: "Start" for entering dyntick-idle mode and "End" for
- * leaving it.
+ * as argument: "Start" for entering dyntick-idle mode, "End" for
+ * leaving it, "--=" for events moving towards idle, and "++=" for events
+ * moving away from idle. "Error on entry: not idle task" and "Error on
+ * exit: not idle task" indicate that a non-idle task is erroneously
+ * toying with the idle loop.
+ *
+ * These events also take a pair of numbers, which indicate the nesting
+ * depth before and after the event of interest. Note that task-related
+ * events use the upper bits of each number, while interrupt-related
+ * events use the lower bits.