trace-cmd: Add -T option to perform stacktraces on each event

Add -T option to perform a stacktrace on each event:

     kworker/3:2-2393  [003] 58549.282806: sched_switch:         kworker/3:2:2393 [120] S ==> trace-cmd:2603 [120]
     kworker/3:2-2393  [003] 58549.282808: kernel_stack:         <stack trace>
=> schedule (ffffffff814b260e)
=> worker_thread (ffffffff8106edd7)
=> kthread (ffffffff81072b43)
=> kernel_thread_helper (ffffffff814bcbe4)
          <idle>-0     [000] 58549.282866: sched_switch:         swapper:0 [120] R ==> trace-cmd:2600 [120]
          <idle>-0     [000] 58549.282869: kernel_stack:         <stack trace>

Signed-off-by: Steven Rostedt <rostedt@goodmis.org>

3 files changed, 14 insertions, 1 deletions

diff --git a/Documentation/trace-cmd-record.1.txt b/Documentation/trace-cmd-record.1.txt
index 2ae6748..87e4f97 100644
--- a/Documentation/trace-cmd-record.1.txt
+++ b/Documentation/trace-cmd-record.1.txt
@@ -55,6 +55,15 @@ OPTIONS
     not be able to display them. If this is the case, then specify the
     *-a* option and the format for all events in the system will be saved.
 
+*-T*::
+    Enable a stacktrace on each event. For example:
+
+          <idle>-0     [003] 58549.289091: sched_switch:         kworker/0:1:0 [120] R ==> trace-cmd:2603 [120]
+          <idle>-0     [003] 58549.289092: kernel_stack:         <stack trace>
+=> schedule (ffffffff814b260e)
+=> cpu_idle (ffffffff8100a38c)
+=> start_secondary (ffffffff814ab828)
+
 *-f* 'filter'::
     Specify a filter for the previous event. This must come after a *-e*. This
     will filter what events get recorded based on the content of the event.
diff --git a/trace-record.c b/trace-record.c
index 2611bfa..a4642bf 100644
--- a/trace-record.c
+++ b/trace-record.c
@@ -1867,7 +1867,7 @@ void trace_record (int argc, char **argv)
                         {NULL, 0, NULL, 0}
                 };
 
-                c = getopt_long (argc-1, argv+1, "+hae:f:Fp:cdo:O:s:r:vg:l:n:P:N:tb:ki",
+                c = getopt_long (argc-1, argv+1, "+hae:f:Fp:cdo:O:s:r:vg:l:n:P:N:tb:kiT",
                                  long_options, &option_index);
                 if (c == -1)
                         break;
@@ -1975,6 +1975,9 @@ void trace_record (int argc, char **argv)
                         option = optarg;
                         save_option(option);
                         break;
+                case 'T':
+                        save_option("stacktrace");
+                        break;
                 case 's':
                         if (extract)
                                 usage(argv);
diff --git a/trace-usage.c b/trace-usage.c
index d1f3bfd..1ecc8fa 100644
--- a/trace-usage.c
+++ b/trace-usage.c
@@ -25,6 +25,7 @@ static struct usage_help usage_help[] = {
                 "          -F filter only on the given process\n"
                 "          -P trace the given pid like -F for the command\n"
                 "          -c also trace the childen of -F or -P\n"
+                "          -T do a stacktrace on all events\n"
                 "          -l filter function name\n"
                 "          -g set graph function\n"
                 "          -n do not trace function\n"