diff options
| author |   Tom Zanussi <tom.zanussi@linux.intel.com> | 2016-03-03 12:54:55 -0600 |
|---|---|---|
| committer |   Steven Rostedt <rostedt@goodmis.org> | 2016-04-19 18:55:57 -0400 |
| commit | d0bad49bb0a094a1beb06640785f95cb256b7272 (patch) | |
| tree | bbcba1655873c597ce50844c5aad99230100b240 /include/linux/trace_events.h | |
| parent | tracing: Remove restriction on string position in hist trigger keys (diff) | |
| download | linux-dev-d0bad49bb0a094a1beb06640785f95cb256b7272.tar.xz linux-dev-d0bad49bb0a094a1beb06640785f95cb256b7272.zip | |
tracing: Add enable_hist/disable_hist triggers
Similar to enable_event/disable_event triggers, these triggers enable
and disable the aggregation of events into maps rather than enabling
and disabling their writing into the trace buffer.
They can be used to automatically start and stop hist triggers based
on a matching filter condition.
If there's a paused hist trigger on system:event, the following would
start it when the filter condition was hit:
# echo enable_hist:system:event [ if filter] > event/trigger
And the following would disable a running system:event hist trigger:
# echo disable_hist:system:event [ if filter] > event/trigger
See Documentation/trace/events.txt for real examples.
Link: http://lkml.kernel.org/r/f812f086e52c8b7c8ad5443487375e03c96a601f.1457029949.git.tom.zanussi@linux.intel.com
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com>
Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'include/linux/trace_events.h')
| -rw-r--r-- | include/linux/trace_events.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/trace_events.h b/include/linux/trace_events.h index 404603720650..5f89a5b0c7e6 100644 --- a/include/linux/trace_events.h +++ b/include/linux/trace_events.h @@ -408,6 +408,7 @@ enum event_trigger_type { ETT_STACKTRACE = (1 << 2), ETT_EVENT_ENABLE = (1 << 3), ETT_EVENT_HIST = (1 << 4), + ETT_HIST_ENABLE = (1 << 5), }; extern int filter_match_preds(struct event_filter *filter, void *rec); |