path: root/Documentation/memory-barriers.txt
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authorPaul E. McKenney <paul.mckenney@linaro.org>2012-11-14 16:26:40 -0800
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2013-01-08 14:14:55 -0800
commit52494535103986dbbf689b44d8c2c7efe2132b16 (patch)
tree88dd5a9d064608e9711c36f05b3b4aab8e255a4f /Documentation/memory-barriers.txt
parentdc975e94f322e60fa8fcc44dec1820fde4de174c (diff)
rcu: Reduce rcutorture tracing
Currently, rcutorture traces every read-side access. This can be problematic because even a two-minute rcutorture run on a two-CPU system can generate 28,853,363 reads. Normally, only a failing read is of interest, so this commit traces adjusts rcutorture's tracing to only trace failing reads. The resulting event tracing records the time and the ->completed value captured at the beginning of the RCU read-side critical section, allowing correlation with other event-tracing messages. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Reviewed-by: Josh Triplett <josh@joshtriplett.org> [ paulmck: Add fix to build problem located by Randy Dunlap based on diagnosis by Steven Rostedt. ]
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