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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 <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. ]
This commit is contained in:
Paul E. McKenney
2012-11-14 16:26:40 -08:00
committed by Paul E. McKenney
parent dc975e94f3
commit 5249453510
5 changed files with 55 additions and 18 deletions
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13
include/linux/rcupdate.h
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@@ -53,7 +53,10 @@ extern int rcutorture_runnable; /* for sysctl */
extern void rcutorture_record_test_transition(void);
extern void rcutorture_record_progress(unsigned long vernum);
extern void do_trace_rcu_torture_read(char *rcutorturename,
struct rcu_head *rhp);
struct rcu_head *rhp,
unsigned long secs,
unsigned long c_old,
unsigned long c);
#else
static inline void rcutorture_record_test_transition(void)
{
@@ -63,9 +66,13 @@ static inline void rcutorture_record_progress(unsigned long vernum)
}
#ifdef CONFIG_RCU_TRACE
extern void do_trace_rcu_torture_read(char *rcutorturename,
struct rcu_head *rhp);
struct rcu_head *rhp,
unsigned long secs,
unsigned long c_old,
unsigned long c);
#else
#define do_trace_rcu_torture_read(rcutorturename, rhp) do { } while (0)
#define do_trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c) \
do { } while (0)
#endif
#endif