diff options
| author | Paul E. McKenney | 2017-10-04 12:29:01 -0700 |
|---|---|---|
| committer | Paul E. McKenney | 2017-11-28 15:51:18 -0800 |
| commit | bd2b879a1ca55486fdb9dcac691bfd3dd79c83d6 (patch) | |
| tree | 93c78b747bc1add858a7c67d02324d9d168dca15 /include/trace/events/rcu.h | |
| parent | 844ccdd7dce2c1a6ea9b437fcf8c3265b136e4a5 (diff) | |
rcu: Add tracing to irq/NMI dyntick-idle transitions
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/trace/events/rcu.h')
| -rw-r--r-- | include/trace/events/rcu.h | 14 |
1 files changed, 8 insertions, 6 deletions
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h index 59d40c454aa0..4674b21247f7 100644 --- a/include/trace/events/rcu.h +++ b/include/trace/events/rcu.h @@ -421,16 +421,18 @@ TRACE_EVENT(rcu_fqs, /* * Tracepoint for dyntick-idle entry/exit events. These take a string - * as argument: "Start" for entering dyntick-idle mode, "End" for - * leaving it, "--=" for events moving towards idle, and "++=" for events - * moving away from idle. "Error on entry: not idle task" and "Error on - * exit: not idle task" indicate that a non-idle task is erroneously + * as argument: "Start" for entering dyntick-idle mode, "Startirq" for + * entering it from irq/NMI, "End" for leaving it, "Endirq" for leaving it + * to irq/NMI, "--=" for events moving towards idle, and "++=" for events + * moving away from idle. "Error on entry: not idle task" and "Error + * on exit: not idle task" indicate that a non-idle task is erroneously * toying with the idle loop. * * These events also take a pair of numbers, which indicate the nesting * depth before and after the event of interest. Note that task-related - * events use the upper bits of each number, while interrupt-related - * events use the lower bits. + * and interrupt-related events use two separate counters, and that the + * "++=" and "--=" events for irq/NMI will change the counter by two, + * otherwise by one. */ TRACE_EVENT(rcu_dyntick, |