forked from luck/tmp_suning_uos_patched
tracing: Add 'stacktrace' event trigger command
Add 'stacktrace' event_command. stacktrace event triggers are added by the user via this command in a similar way and using practically the same syntax as the analogous 'stacktrace' ftrace function command, but instead of writing to the set_ftrace_filter file, the stacktrace event trigger is written to the per-event 'trigger' files: echo 'stacktrace' > .../tracing/events/somesys/someevent/trigger The above command will turn on stacktraces for someevent i.e. whenever someevent is hit, a stacktrace will be logged. This also adds a 'count' version that limits the number of times the command will be invoked: echo 'stacktrace:N' > .../tracing/events/somesys/someevent/trigger Where N is the number of times the command will be invoked. The above command will log N stacktraces for someevent i.e. whenever someevent is hit N times, a stacktrace will be logged. Link: http://lkml.kernel.org/r/0c30c008a0828c660aa0e1bbd3255cf179ed5c30.1382622043.git.tom.zanussi@linux.intel.com Signed-off-by: Tom Zanussi <tom.zanussi@linux.intel.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
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93e31ffbf4
commit
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@ -347,6 +347,7 @@ enum event_trigger_type {
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ETT_NONE = (0),
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ETT_TRACE_ONOFF = (1 << 0),
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ETT_SNAPSHOT = (1 << 1),
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ETT_STACKTRACE = (1 << 2),
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};
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extern void destroy_preds(struct ftrace_event_file *file);
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@ -780,6 +780,84 @@ static __init int register_trigger_snapshot_cmd(void)
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static __init int register_trigger_snapshot_cmd(void) { return 0; }
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#endif /* CONFIG_TRACER_SNAPSHOT */
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#ifdef CONFIG_STACKTRACE
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/*
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* Skip 3:
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* stacktrace_trigger()
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* event_triggers_post_call()
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* ftrace_raw_event_xxx()
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*/
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#define STACK_SKIP 3
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static void
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stacktrace_trigger(struct event_trigger_data *data)
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{
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trace_dump_stack(STACK_SKIP);
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}
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static void
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stacktrace_count_trigger(struct event_trigger_data *data)
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{
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if (!data->count)
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return;
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if (data->count != -1)
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(data->count)--;
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stacktrace_trigger(data);
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}
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static int
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stacktrace_trigger_print(struct seq_file *m, struct event_trigger_ops *ops,
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struct event_trigger_data *data)
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{
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return event_trigger_print("stacktrace", m, (void *)data->count,
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data->filter_str);
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}
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static struct event_trigger_ops stacktrace_trigger_ops = {
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.func = stacktrace_trigger,
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.print = stacktrace_trigger_print,
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.init = event_trigger_init,
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.free = event_trigger_free,
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};
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static struct event_trigger_ops stacktrace_count_trigger_ops = {
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.func = stacktrace_count_trigger,
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.print = stacktrace_trigger_print,
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.init = event_trigger_init,
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.free = event_trigger_free,
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};
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static struct event_trigger_ops *
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stacktrace_get_trigger_ops(char *cmd, char *param)
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{
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return param ? &stacktrace_count_trigger_ops : &stacktrace_trigger_ops;
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}
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static struct event_command trigger_stacktrace_cmd = {
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.name = "stacktrace",
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.trigger_type = ETT_STACKTRACE,
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.post_trigger = true,
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.func = event_trigger_callback,
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.reg = register_trigger,
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.unreg = unregister_trigger,
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.get_trigger_ops = stacktrace_get_trigger_ops,
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};
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static __init int register_trigger_stacktrace_cmd(void)
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{
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int ret;
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ret = register_event_command(&trigger_stacktrace_cmd);
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WARN_ON(ret < 0);
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return ret;
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}
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#else
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static __init int register_trigger_stacktrace_cmd(void) { return 0; }
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#endif /* CONFIG_STACKTRACE */
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static __init void unregister_trigger_traceon_traceoff_cmds(void)
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{
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unregister_event_command(&trigger_traceon_cmd);
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@ -804,6 +882,7 @@ __init int register_trigger_cmds(void)
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{
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register_trigger_traceon_traceoff_cmds();
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register_trigger_snapshot_cmd();
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register_trigger_stacktrace_cmd();
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return 0;
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}
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