On Thu, 12 Sep 2013 03:16:00 +0000 "Du, Yuyang" <yuyang.du@xxxxxxxxx> wrote: > Because I want to save start and end snapshots of some state. > I'm not exactly sure what you want. You can use the new "snapshot" feature (available since 3.10) and save the start and stop of a state without the need of tracing it. echo 1 > /sys/kernel/debug/tracing/snapshot cat /sys/kernel/debug/tracing/snapshot -- Steve -- To unsubscribe from this list: send the line "unsubscribe linux-trace-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html