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rcu: Add more tracing of expedited grace periods

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This commit adds more tracing of expedited grace periods to enable
improved debugging of slowdowns.

Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
This commit is contained in:
Paul E. McKenney
2018-01-31 19:23:24 -08:00
parent 274afd6bfa
commit 9a414201ae
3 changed files with 22 additions and 1 deletions
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3
include/trace/events/rcu.h
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@@ -179,6 +179,9 @@ TRACE_EVENT(rcu_grace_period_init,
*
* "snap": Captured snapshot of expedited grace period sequence number.
* "start": Started a real expedited grace period.
* "reset": Started resetting the tree
* "select": Started selecting the CPUs to wait on.
* "startwait": Started waiting on selected CPUs.
* "end": Ended a real expedited grace period.
* "endwake": Woke piggybackers up.
* "done": Someone else did the expedited grace period for us.