From dff81f559285b5c6df287eb231a9d6b02057ef8b Mon Sep 17 00:00:00 2001 From: Tom Zanussi Date: Wed, 13 Feb 2019 17:42:48 -0600 Subject: 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 Signed-off-by: Steven Rostedt (VMware) --- kernel/trace/trace.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'kernel/trace/trace.c') 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 .\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 (param list) - generate synthetic event\n" "\t save(field,...) - save current event fields\n" -- cgit v1.2.3