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rcu: Add failure tracing to rcutorture

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Trace the rcutorture RCU accesses and dump the trace buffer when the
first failure is detected.

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>
This commit is contained in:
Paul E. McKenney
2011-10-02 07:44:32 -07:00
committed by Paul E. McKenney
parent a8eecf2248
commit 91afaf3002
4 changed files with 62 additions and 0 deletions
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8
include/linux/rcupdate.h
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@ -51,6 +51,8 @@ extern int rcutorture_runnable; /* for sysctl */
#if defined(CONFIG_TREE_RCU) || defined(CONFIG_TREE_PREEMPT_RCU)
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);
#else
static inline void rcutorture_record_test_transition(void)
{
@ -58,6 +60,12 @@ static inline void rcutorture_record_test_transition(void)
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);
#else
#define do_trace_rcu_torture_read(rcutorturename, rhp) do { } while (0)
#endif
#endif
#define UINT_CMP_GE(a, b) (UINT_MAX / 2 >= (a) - (b))