Merge branch 'master' of ssh://sources.redhat.com/git/systemtap

1 files changed, 14 insertions, 1 deletions

diff --git a/tapset/context-unwind.stp b/tapset/context-unwind.stp
index d6654d25..33431fd0 100644
--- a/tapset/context-unwind.stp
+++ b/tapset/context-unwind.stp
@@ -8,7 +8,7 @@
 // later version.
 // <tapsetdescription>
 // Context functions provide additional information about where an event occurred. These functions can 
-//provide information such as a backtrace to where the event occured and the current register values for the 
+//provide information such as a backtrace to where the event occurred and the current register values for the 
 //processor.
 // </tapsetdescription>
 %{
@@ -48,6 +48,19 @@ function backtrace:string () %{ /* pure */
 %}
 
 /**
+ * sfunction task_backtrace - Hex backtrace of an arbitrary task
+ * @task: pointer to task_struct
+ *
+ *  Return a string of hex addresses that are a backtrace of the 
+ *  stack of a particular task.  Output may be truncated as per
+ *  maximum string length.
+ */
+function task_backtrace:string (task:long) %{ /* pure */
+	 _stp_stack_snprint_tsk(THIS->__retvalue, MAXSTRINGLEN,
+		(struct task_struct *)(unsigned long)THIS->task, 0, MAXTRACE);
+%}
+
+/**
  * sfunction caller - Return name and address of calling function
  *
  *  Return the address and name of the calling function.