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>
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@ -1292,6 +1292,12 @@ struct event_trigger_ops {
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* itself logs to the trace buffer, this flag should be set,
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* otherwise it can be left unspecified.
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*
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* @needs_rec: A flag that says whether or not this command needs
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* access to the trace record in order to perform its function,
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* regardless of whether or not it has a filter associated with
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* it (filters make a trigger require access to the trace record
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* but are not always present).
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*
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* All the methods below, except for @set_filter(), must be
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* implemented.
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*
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@ -1332,6 +1338,7 @@ struct event_command {
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char *name;
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enum event_trigger_type trigger_type;
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bool post_trigger;
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bool needs_rec;
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int (*func)(struct event_command *cmd_ops,
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struct trace_event_file *file,
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char *glob, char *cmd, char *params);
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@ -493,7 +493,8 @@ void update_cond_flag(struct trace_event_file *file)
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bool set_cond = false;
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list_for_each_entry_rcu(data, &file->triggers, list) {
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if (data->filter || data->cmd_ops->post_trigger) {
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if (data->filter || data->cmd_ops->post_trigger ||
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data->cmd_ops->needs_rec) {
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set_cond = true;
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break;
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}
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