Hi developers To measure I/O latencies of mapped devices, I see that we can use dmstats. From the manpage [1] and from my tests, it seems like latencies are not reported for read and write ops separately. I checked dm_stat_for_entry() and it looks like we disregard the I/O direction when tallying in the histogram.
So is it correct that dmstats only tracks and reports combined latencies? Is there a way to measure read and write latency percentiles individually? Thank you Robert Pang [1] https://man7.org/linux/man-pages/man8/dmstats.8.html
