Messages in this thread Patch in this message | | | From | Tom Zanussi <> | Subject | [PATCH v12 07/30] tracing: Add needs_rec flag to event triggers | Date | Mon, 23 Nov 2015 13:51:22 -0600 |
| |
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.
Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Tested-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> --- kernel/trace/trace.h | 7 +++++++ kernel/trace/trace_events_trigger.c | 3 ++- 2 files changed, 9 insertions(+), 1 deletion(-)
diff --git a/kernel/trace/trace.h b/kernel/trace/trace.h index 5e23a97..300add5 100644 --- a/kernel/trace/trace.h +++ b/kernel/trace/trace.h @@ -1293,6 +1293,12 @@ 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. * @@ -1333,6 +1339,7 @@ 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 8375d29..2f881e9 100644 --- a/kernel/trace/trace_events_trigger.c +++ b/kernel/trace/trace_events_trigger.c @@ -498,7 +498,8 @@ 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; } -- 1.9.3
| |