On Fri, Sep 21, 2018 at 08:27:17PM -0600, Jens Axboe wrote: > 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. Thanks, Jens. I also just pushed a regression test to blktests.
