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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 /kernel/rcupdate.c
parentdc975e94f322e60fa8fcc44dec1820fde4de174c (diff)
downloadlinux-linaro-stable-52494535103986dbbf689b44d8c2c7efe2132b16.tar.gz
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 'kernel/rcupdate.c')
-rw-r--r--kernel/rcupdate.c9
1 files changed, 6 insertions, 3 deletions
diff --git a/kernel/rcupdate.c b/kernel/rcupdate.c
index a2cf76177b44..303359d1ca88 100644
--- a/kernel/rcupdate.c
+++ b/kernel/rcupdate.c
@@ -404,11 +404,14 @@ EXPORT_SYMBOL_GPL(rcuhead_debug_descr);
#endif /* #ifdef CONFIG_DEBUG_OBJECTS_RCU_HEAD */
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU) || defined(CONFIG_RCU_TRACE)
-void do_trace_rcu_torture_read(char *rcutorturename, struct rcu_head *rhp)
+void do_trace_rcu_torture_read(char *rcutorturename, struct rcu_head *rhp,
+ unsigned long secs,
+ unsigned long c_old, unsigned long c)
{
- trace_rcu_torture_read(rcutorturename, rhp);
+ trace_rcu_torture_read(rcutorturename, rhp, secs, c_old, c);
}
EXPORT_SYMBOL_GPL(do_trace_rcu_torture_read);
#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