Hi, As for my understanding I no need to handle (BLKRESTART, BLKTRACESTOP, BLKTRACESETUP ..) in my device ioctl handling. It is block l/O layer which intercepts the statistics and does the job. But for my device (not sda or hda), blktrace only show the Q events. It is not showing even C (completed) events. Do I need to add the support in my device ioctl handling code? Thanks, Gangadhar -- 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