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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 /include/linux/rcupdate.h
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. ]
Diffstat (limited to 'include/linux/rcupdate.h')
-rw-r--r--include/linux/rcupdate.h13
1 files changed, 10 insertions, 3 deletions
diff --git a/include/linux/rcupdate.h b/include/linux/rcupdate.h
index 275aa3f1062d..7f89cea596e1 100644
--- a/include/linux/rcupdate.h
+++ b/include/linux/rcupdate.h
@@ -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