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rcu: Reduce rcutorture tracing

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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 <[email protected]>
Signed-off-by: Paul E. McKenney <[email protected]>
Reviewed-by: Josh Triplett <[email protected]>
[ paulmck: Add fix to build problem located by Randy Dunlap based on
  diagnosis by Steven Rostedt. ]
This commit is contained in:
Paul E. McKenney 2012-11-14 16:26:40 -08:00 • committed by Paul E. McKenney
commit 5249453510
5 changed files with 55 additions and 18 deletions
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1
lib/Kconfig.debug
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@ -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.