summaryrefslogtreecommitdiff
path: root/kernel/trace/trace_events_trigger.c
diff options
context:
space:
mode:
authorTom Zanussi <tom.zanussi@linux.intel.com>2018-01-16 05:51:56 +0300
committerSteven Rostedt (VMware) <rostedt@goodmis.org>2018-03-11 00:05:58 +0300
commit067fe038e70f6e64960d26a79c4df5f1413d0f13 (patch)
tree57e3c474f63b54b5a20494b2344a28efa0b9f976 /kernel/trace/trace_events_trigger.c
parent19a9facd0fe33a3e376923383958b2c86cbd3994 (diff)
downloadlinux-067fe038e70f6e64960d26a79c4df5f1413d0f13.tar.xz
tracing: Add variable reference handling to hist triggers
Add the necessary infrastructure to allow the variables defined on one event to be referenced in another. This allows variables set by a previous event to be referenced and used in expressions combining the variable values saved by that previous event and the event fields of the current event. For example, here's how a latency can be calculated and saved into yet another variable named 'wakeup_lat': # echo 'hist:keys=pid,prio:ts0=common_timestamp ... # echo 'hist:keys=next_pid:wakeup_lat=common_timestamp-$ts0 ... In the first event, the event's timetamp is saved into the variable ts0. In the next line, ts0 is subtracted from the second event's timestamp to produce the latency. Further users of variable references will be described in subsequent patches, such as for instance how the 'wakeup_lat' variable above can be displayed in a latency histogram. Link: http://lkml.kernel.org/r/b1d3e6975374e34d501ff417c20189c3f9b2c7b8.1516069914.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_events_trigger.c')
-rw-r--r--kernel/trace/trace_events_trigger.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c
index 632471692462..d251cabcf69a 100644
--- a/kernel/trace/trace_events_trigger.c
+++ b/kernel/trace/trace_events_trigger.c
@@ -909,6 +909,12 @@ void set_named_trigger_data(struct event_trigger_data *data,
data->named_data = named_data;
}
+struct event_trigger_data *
+get_named_trigger_data(struct event_trigger_data *data)
+{
+ return data->named_data;
+}
+
static void
traceon_trigger(struct event_trigger_data *data, void *rec,
struct ring_buffer_event *event)