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| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2013-10-24 08:59:28 -0500 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2013-12-21 22:02:16 -0500 |
| commit | 7862ad1846e994574cb47dc503cc2b1646ea6593 (patch) | |
| tree | cec348fd60d6f85d1ae772996d0b8241a31d5b35 /include/linux/ftrace_event.h | |
| parent | f21ecbb35f865a508073c0e73854da469a07f278 (diff) | |
| download | lwn-7862ad1846e994574cb47dc503cc2b1646ea6593.tar.gz lwn-7862ad1846e994574cb47dc503cc2b1646ea6593.zip | |
tracing: Add 'enable_event' and 'disable_event' event trigger commands
Add 'enable_event' and 'disable_event' event_command commands.
enable_event and disable_event event triggers are added by the user
via these commands in a similar way and using practically the same
syntax as the analagous 'enable_event' and 'disable_event' ftrace
function commands, but instead of writing to the set_ftrace_filter
file, the enable_event and disable_event triggers are written to the
per-event 'trigger' files:
echo 'enable_event:system:event' > .../othersys/otherevent/trigger
echo 'disable_event:system:event' > .../othersys/otherevent/trigger
The above commands will enable or disable the 'system:event' trace
events whenever the othersys:otherevent events are hit.
This also adds a 'count' version that limits the number of times the
command will be invoked:
echo 'enable_event:system:event:N' > .../othersys/otherevent/trigger
echo 'disable_event:system:event:N' > .../othersys/otherevent/trigger
Where N is the number of times the command will be invoked.
The above commands will will enable or disable the 'system:event'
trace events whenever the othersys:otherevent events are hit, but only
N times.
This also makes the find_event_file() helper function extern, since
it's useful to use from other places, such as the event triggers code,
so make it accessible.
Link: http://lkml.kernel.org/r/f825f3048c3f6b026ee37ae5825f9fc373451828.1382622043.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 65caee44b4a9..2f73c3988fc7 100644 --- a/include/linux/ftrace_event.h +++ b/include/linux/ftrace_event.h @@ -348,6 +348,7 @@ enum event_trigger_type { ETT_TRACE_ONOFF = (1 << 0), ETT_SNAPSHOT = (1 << 1), ETT_STACKTRACE = (1 << 2), + ETT_EVENT_ENABLE = (1 << 3), }; extern void destroy_preds(struct ftrace_event_file *file); |