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| author | Tom Zanussi | 2013-10-24 15:59:27 +0200 |
|---|---|---|
| committer | Steven Rostedt | 2013-12-22 04:02:15 +0100 |
| commit | f21ecbb35f865a508073c0e73854da469a07f278 (patch) | |
| tree | 75f014738b5bbe844abdf087b6897b14c6c29bd9 /include/linux/ftrace_event.h | |
| parent | tracing: Add 'snapshot' event trigger command (diff) | |
| download | kernel-qcow2-linux-f21ecbb35f865a508073c0e73854da469a07f278.tar.gz kernel-qcow2-linux-f21ecbb35f865a508073c0e73854da469a07f278.tar.xz kernel-qcow2-linux-f21ecbb35f865a508073c0e73854da469a07f278.zip | |
tracing: Add 'stacktrace' event trigger command
Add 'stacktrace' event_command. stacktrace event triggers are added
by the user via this command in a similar way and using practically
the same syntax as the analogous 'stacktrace' ftrace function command,
but instead of writing to the set_ftrace_filter file, the stacktrace
event trigger is written to the per-event 'trigger' files:
echo 'stacktrace' > .../tracing/events/somesys/someevent/trigger
The above command will turn on stacktraces for someevent i.e. whenever
someevent is hit, a stacktrace will be logged.
This also adds a 'count' version that limits the number of times the
command will be invoked:
echo 'stacktrace:N' > .../tracing/events/somesys/someevent/trigger
Where N is the number of times the command will be invoked.
The above command will log N stacktraces for someevent i.e. whenever
someevent is hit N times, a stacktrace will be logged.
Link: http://lkml.kernel.org/r/0c30c008a0828c660aa0e1bbd3255cf179ed5c30.1382622043.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/ftrace_event.h')
| -rw-r--r-- | include/linux/ftrace_event.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/ftrace_event.h b/include/linux/ftrace_event.h index 6efa8c2745b5..65caee44b4a9 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -347,6 +347,7 @@ enum event_trigger_type { ETT_NONE = (0), ETT_TRACE_ONOFF = (1 << 0), ETT_SNAPSHOT = (1 << 1), + ETT_STACKTRACE = (1 << 2), }; extern void destroy_preds(struct ftrace_event_file *file); |