On Thu, 12 Sep 2013 04:58:41 +0000 "Du, Yuyang" <yuyang.du@xxxxxxxxx> wrote: > Thanks, Steve. > > Virtually, what I want is: > > tracing_on(1), snapshort, traces..., snapshot, tracing_on(0). > > If I understand right, I need the new feature "snapshot" in ftrace. But, it seems snapshot and ftrace are separated, which does not satisfy my need. > I don't understand what you mean by "snapshot and ftrace are separated"? The snapshot feature is part of ftrace. Basically, you have two buffers: an active one, and a static one. When you echo 1 into the snapshot file, it swaps the two buffers. The active one becomes the static one, and the static one becomes the active one. This allows you to save off a trace while tracing continues. -- 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
|