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| author | John Ogness <john.ogness@linutronix.de> | 2019-04-03 13:31:00 +0206 |
|---|---|---|
| committer | John Ogness <john.ogness@linutronix.de> | 2019-04-03 13:31:00 +0206 |
| commit | d86b8ab490be3d252b2960e77157c89f502fa4fe (patch) | |
| tree | 7835a5c817ac16d132de9610612065fe9df530f1 | |
| parent | b8f92e275f24599253d4a66c3d3d2ebd70c1eb93 (diff) | |
sleep_wake: update with more details, new events
There were an unnecessary number of events that were captured.
Only capture the ones that are truly interesting. And add the
irq vector.
Also, add some description to the significance of the events.
Signed-off-by: John Ogness <john.ogness@linutronix.de>
| -rw-r--r-- | schulung_tools/sleep_wake/README | 34 |
1 files changed, 21 insertions, 13 deletions
diff --git a/schulung_tools/sleep_wake/README b/schulung_tools/sleep_wake/README index b18efa9..5e4da5c 100644 --- a/schulung_tools/sleep_wake/README +++ b/schulung_tools/sleep_wake/README @@ -1,19 +1,27 @@ #!/bin/sh -sudo trace-cmd record -e sched:* -e timer:* -e syscalls:* chrt -f 98 /bin/sleep 2 +sudo trace-cmd record \ + -e syscalls:sys_enter_nanosleep \ + -e timer:hrtimer_start \ + -e sched:sched_switch \ + -e irq_vectors:local_timer_entry \ + -e timer:hrtimer_expire_entry \ + -e sched:sched_wakeup \ + -e syscalls:sys_exit_nanosleep \ + chrt -f 98 /bin/sleep 2 -# Notice the chain of events: +# Notice the chain of events (and their latencies!): # -# sys_enter_nanosleep -# hrtimer_init -# hrtimer_start -# sched_switch -# ... -# hrtimer_cancel -# hrtimer_expire_entry -# sched_wakeup -# hrtimer_expire_exit -# sched_switch -# sys_exit_nanosleep +# sys_enter_nanosleep (call to clock_nanosleep()) +# hrtimer_start (hrtimer set) +# sched_switch (go to sleep) +# +# ... about 2 seconds later ... +# +# local_timer_entry (cpu in irq vector) +# hrtimer_expire_entry (hrtimer callback) +# sched_wakeup (wake the sleeping task) +# sched_switch (task scheduled) +# sys_exit_nanosleep (return from clock_nanosleep()) kernelshark |