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rcu: Add event-tracing for RCU callback invocation
authorPaul E. McKenney <paul.mckenney@linaro.org>
Fri, 17 Jun 2011 22:53:19 +0000 (15:53 -0700)
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>
Thu, 29 Sep 2011 04:38:12 +0000 (21:38 -0700)
There was recently some controversy about the overhead of invoking RCU
callbacks.  Add TRACE_EVENT()s to obtain fine-grained timings for the
start and stop of a batch of callbacks and also for each callback invoked.

Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org>
Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>

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