diff options
| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2019-02-13 17:42:48 -0600 |
|---|---|---|
| committer | Steven Rostedt (VMware) <rostedt@goodmis.org> | 2019-02-20 13:51:07 -0500 |
| commit | dff81f559285b5c6df287eb231a9d6b02057ef8b (patch) | |
| tree | a244223ef1235c75508ed624ea1a7fe718ef9f22 /kernel/trace/trace.c | |
| parent | fd451a3d9291815d13f3f1ce60537b7f19616b23 (diff) | |
tracing: Add hist trigger onchange() handler
Add support for a hist:onchange($var) handler, similar to the onmax()
handler but triggering whenever there's any change in $var, not just a
max.
Link: http://lkml.kernel.org/r/dfbc7e4ada242603e9ec3f049b5ad076a07dfd03.1550100284.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Diffstat (limited to 'kernel/trace/trace.c')
| -rw-r--r-- | kernel/trace/trace.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index dd60c14a0fb0..be6779f963c6 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4915,7 +4915,8 @@ static const char readme_msg[] = "\t <handler>.<action>\n\n" "\t The available handlers are:\n\n" "\t onmatch(matching.event) - invoke on addition or update\n" - "\t onmax(var) - invoke if var exceeds current max\n\n" + "\t onmax(var) - invoke if var exceeds current max\n" + "\t onchange(var) - invoke action if var changes\n\n" "\t The available actions are:\n\n" "\t <synthetic_event>(param list) - generate synthetic event\n" "\t save(field,...) - save current event fields\n" |