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-rw-r--r--Documentation/RCU/trace.txt12
1 files changed, 10 insertions, 2 deletions
diff --git a/Documentation/RCU/trace.txt b/Documentation/RCU/trace.txt
index 40b530dd0fc..fd4bffb6e8c 100644
--- a/Documentation/RCU/trace.txt
+++ b/Documentation/RCU/trace.txt
@@ -159,8 +159,8 @@ o "qs" gives an indication of the state of the callback queue
the corresponding character is replaced by ".".
o "kt" is the per-CPU kernel-thread state. The digit preceding
- the slash is zero if there is no work pending and 1 otherwise.
- The character after the slash is as follows:
+ the first slash is zero if there is no work pending and 1
+ otherwise. The character between the slashes is as follows:
"S" The kernel thread is stopped, in other words, all
CPUs corresponding to this rcu_node structure are
@@ -171,10 +171,18 @@ o "kt" is the per-CPU kernel-thread state. The digit preceding
"W" The kernel thread is waiting because there is no work
for it to do.
+ "O" The kernel thread is waiting because it has been
+ forced off of its designated CPU or because its
+ ->cpus_allowed mask permits it to run on other than
+ its designated CPU.
+
"Y" The kernel thread is yielding to avoid hogging CPU.
"?" Unknown value, indicates a bug.
+ The number after the final slash is the CPU that the kthread
+ is actually running on.
+
o "b" is the batch limit for this CPU. If more than this number
of RCU callbacks is ready to invoke, then the remainder will
be deferred.