Commits
Steven Rostedt (Red Hat) committed dd97b95438c
tracing: Show available event triggers when no trigger is set Currently there's no way to know what triggers exist on a kernel without looking at the source of the kernel or randomly trying out triggers. Instead of creating another file in the debugfs system, simply show what available triggers are there when cat'ing the trigger file when it has no events: [root /sys/kernel/debug/tracing]# cat events/sched/sched_switch/trigger # Available triggers: # traceon traceoff snapshot stacktrace enable_event disable_event This stays consistent with other debugfs files where meta data like this is always proceeded with a '#' at the start of the line so that tools can strip these out. Link: http://lkml.kernel.org/r/20140107103548.0a84536d@gandalf.local.home Signed-off-by: Steven Rostedt <rostedt@goodmis.org>