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| author | Paul E. McKenney <paul.mckenney@linaro.org> | 2012-11-14 16:26:40 -0800 |
|---|---|---|
| committer | Paul E. McKenney <paulmck@linux.vnet.ibm.com> | 2013-01-08 14:14:55 -0800 |
| commit | 52494535103986dbbf689b44d8c2c7efe2132b16 (patch) | |
| tree | 88dd5a9d064608e9711c36f05b3b4aab8e255a4f /lib | |
| parent | dc975e94f322e60fa8fcc44dec1820fde4de174c (diff) | |
| download | linux-52494535103986dbbf689b44d8c2c7efe2132b16.tar.bz2 | |
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. ]
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Kconfig.debug | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug index 3a353091a903..7d83f52fbade 100644 --- a/lib/Kconfig.debug +++ b/lib/Kconfig.debug @@ -1008,6 +1008,7 @@ config RCU_CPU_STALL_INFO config RCU_TRACE bool "Enable tracing for RCU" depends on DEBUG_KERNEL + select TRACE_CLOCK help This option provides tracing in RCU which presents stats in debugfs for debugging RCU implementation. |