Hi, Guys, I am trying to visualize io pattern by bno_plot. bno_plot requires an output from btt -B but btt -B doesn't output anything for DM devices (e.g. /dev/mapper/mydev) while it does for real block devices (e.g. /dev/sdc). For narrowing down the problem I reproduced this problem with simple linear device. # Setup root@Freedom:/home/akira# dmsetup create mydev --table "0 100000 linear /dev/sdc 0" root@Freedom:/home/akira# dmsetup ls pdc_fgaahfadb (254:0) mydev (254:1) <- this # Trace root@Freedom:/home/akira# cat devlist /dev/mapper/mydev /dev/sdc root@Freedom:/home/akira# blktrace -w 30 -I devlist -D mytrace === dm-1 === CPU 0: 0 events, 0 KiB data CPU 1: 378 events, 18 KiB data Total: 378 events (dropped 0), 18 KiB data === sdc === CPU 0: 0 events, 0 KiB data CPU 1: 781 events, 37 KiB data Total: 781 events (dropped 0), 37 KiB data root@Freedom:/home/akira# ls mytrace/ dm-1.blktrace.0 dm-1.blktrace.1 sdc.blktrace.0 sdc.blktrace.1 # btt root@Freedom:/home/akira# btt -i mytrace/sdc.blktrace.* -B sdc root@Freedom:/home/akira# btt -i mytrace/dm-1.blktrace.* -B dm-1 root@Freedom:/home/akira# ls *.dat sdc_008,032_c.dat sdc_008,032_r.dat btt doesn't output anything with dm-1.blktrace.* . Is this intentionally designed or just a (known/unknown) bug? Or, do I forget something? Thanks, Akira -- 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
