[Crash-utility] [PATCH] Add -r option to timer

[Dave Anderson]

Hi Qiao,

Clarify this for me -- the offset value for the ktime_get_real() timer is
presumably the current per-timer clock value for that timer:

cpu: 0  HRTIMER_CPU_BASE: ffff880004159d20
  clock: 0  HRTIMER_CLOCK_BASE: ffff880004159d28
    OFFSET:     1277723463192897448
    GET_TIME:   ktime_get_real
    ACTIVE TIMERS:
                      EXPIRES                      HRTIMER           FUNCTION
      1277723709520405731-1277723709520455731  ffff88001cc71d18  ffffffff81093e00  <hrtimer_wakeup>

But what does an offset of 0 mean for ktime_get() timers?

  clock: 1  HRTIMER_CLOCK_BASE: ffff880004159d68
    OFFSET:     0
    GET_TIME:   ktime_get
    ACTIVE TIMERS:
                EXPIRES                HRTIMER           FUNCTION
       205155628339-205156606338   ffff88001dfa1a68  ffffffff81093e00  <hrtimer_wakeup>
       205500000000-205500000000   ffff880004159e20  ffffffff810a0290  <tick_sched_timer>
       212807104852-212807154852   ffff88000355fea8  ffffffff81093e00  <hrtimer_wakeup>
       221875226353-221905226352   ffff880003611a68  ffffffff81093e00  <hrtimer_wakeup>
       237880877947-237880927947   ffff88001df2dea8  ffffffff81093e00  <hrtimer_wakeup>
       254807591647-254877419646   ffff88001d67ba68  ffffffff81093e00  <hrtimer_wakeup>
       347174079293-347174079293   ffff8800035edc68  ffffffff810701a0  <it_real_fn>

And for the old-style hrtimers, there is no offset value shown at all.  What would
their expires values compare to?

  clock: 1  HRTIMER_BASE: ffff810009006500
    GET_TIME:   ktime_get
    ACTIVE TIMERS:
          EXPIRES          HRTIMER           FUNCTION
      614160200709018  ffff81042e432ab0  ffffffff80095103  <it_real_fn>
      614160235717018  ffff8103d93681b0  ffffffff80095103  <it_real_fn>

Dave