On 9/21/18 5:44 PM, Omar Sandoval wrote: > From: Omar Sandoval <osandov@xxxxxx> > > Klaus Kusche reported that the I/O busy time in /proc/diskstats was not > updating properly on 4.18. This is because we started using ktime to > track elapsed time, and we convert nanoseconds to jiffies when we update > the partition counter. However, this gets rounded down, so any I/Os that > take less than a jiffy are not accounted for. Previously in this case, > the value of jiffies would sometimes increment while we were doing I/O, > so at least some I/Os were accounted for. > > Let's convert the stats to use nanoseconds internally. We still report > milliseconds as before, now more accurately than ever. The value is > still truncated to 32 bits for backwards compatibility. Thanks Omar, applied for 4.19. -- Jens Axboe
