From: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx> Add abbreviated documentation for handlers and actions to README. Signed-off-by: Tom Zanussi <tom.zanussi@xxxxxxxxxxxxxxx> --- kernel/trace/trace.c | 12 +++++++++++- 1 file changed, 11 insertions(+), 1 deletion(-) diff --git a/kernel/trace/trace.c b/kernel/trace/trace.c index 147be8523560..fc0721b3e31d 100644 --- a/kernel/trace/trace.c +++ b/kernel/trace/trace.c @@ -4680,6 +4680,7 @@ static const char readme_msg[] = "\t [:size=#entries]\n" "\t [:pause][:continue][:clear]\n" "\t [:name=histname1]\n" + "\t [:<handler>.<action>]\n" "\t [if <filter>]\n\n" "\t When a matching event is hit, an entry is added to a hash\n" "\t table using the key(s) and value(s) named, and the value of a\n" @@ -4721,7 +4722,16 @@ static const char readme_msg[] = "\t The enable_hist and disable_hist triggers can be used to\n" "\t have one event conditionally start and stop another event's\n" "\t already-attached hist trigger. The syntax is analagous to\n" - "\t the enable_event and disable_event triggers.\n" + "\t the enable_event and disable_event triggers.\n\n" + "\t Hist trigger handlers and actions are executed whenever a\n" + "\t a histogram entry is added or updated. They take the form:\n\n" + "\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 The available actions are:\n\n" + "\t <synthetic_event>(param list) - generate synthetic event\n" + "\t save(field,...) - save current event fields\n" #endif ; -- 2.14.1
