On Thu, Oct 30 2008, Martin Peschke wrote: > Hi, > > I have noticed that I get C traces but no D traces for device mapper > devices. Is blktrace supposed to handle dm devices as well? The dispatch event is associated with request dispatching, which dm/md does not do. You should get redirect events, telling you when the IO is being redirected to the bottom device. Or split events. -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-btrace" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
