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| author | Tom Zanussi <tom.zanussi@linux.intel.com> | 2015-12-10 19:50:48 +0100 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2016-03-08 17:19:34 +0100 |
| commit | a5863dae84e2da83a1e5de485a7f150d0c28f08e (patch) | |
| tree | 4fc823d2b4c49168d706097cdc0a2bbe8c4575af | |
| parent | tracing: Add a per-event-trigger 'paused' field (diff) | |
| download | linux-a5863dae84e2da83a1e5de485a7f150d0c28f08e.tar.xz linux-a5863dae84e2da83a1e5de485a7f150d0c28f08e.zip | |
tracing: Add needs_rec flag to event triggers
Add a new needs_rec flag for triggers that require unconditional
access to trace records in order to function.
Normally a trigger requires access to the contents of a trace record
only if it has a filter associated with it (since filters need the
contents of a record in order to make a filtering decision). Some
types of triggers, such as 'hist' triggers, require access to trace
record contents independent of the presence of filters, so add a new
flag for those triggers.
Link: http://lkml.kernel.org/r/7be8fa38f9b90fdb6c47ca0f98d20a07b9fd512b.1449767187.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>
| -rw-r--r-- | kernel/trace/trace.h | 7 | ||||
| -rw-r--r-- | kernel/trace/trace_events_trigger.c | 3 |
2 files changed, 9 insertions, 1 deletions
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index f1868677f856..8c6aefbb24d2 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -1292,6 +1292,12 @@ struct event_trigger_ops { * itself logs to the trace buffer, this flag should be set, * otherwise it can be left unspecified. * + * @needs_rec: A flag that says whether or not this command needs + * access to the trace record in order to perform its function, + * regardless of whether or not it has a filter associated with + * it (filters make a trigger require access to the trace record + * but are not always present). + * * All the methods below, except for @set_filter(), must be * implemented. * @@ -1332,6 +1338,7 @@ struct event_command { char *name; enum event_trigger_type trigger_type; bool post_trigger; + bool needs_rec; int (*func)(struct event_command *cmd_ops, struct trace_event_file *file, char *glob, char *cmd, char *params); diff --git a/kernel/trace/trace_events_trigger.c b/kernel/trace/trace_events_trigger.c index e4d8b3763175..a11bb4780f82 100644 --- a/kernel/trace/trace_events_trigger.c +++ b/kernel/trace/trace_events_trigger.c @@ -493,7 +493,8 @@ void update_cond_flag(struct trace_event_file *file) bool set_cond = false; list_for_each_entry_rcu(data, &file->triggers, list) { - if (data->filter || data->cmd_ops->post_trigger) { + if (data->filter || data->cmd_ops->post_trigger || + data->cmd_ops->needs_rec) { set_cond = true; break; } |