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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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26
include/trace/events/rcu.h
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@@ -437,6 +437,31 @@ TRACE_EVENT(rcu_batch_end,
__entry->rcuname, __entry->callbacks_invoked)
);
/*
* Tracepoint for rcutorture readers. The first argument is the name
* of the RCU flavor from rcutorture's viewpoint and the second argument
* is the callback address.
*/
TRACE_EVENT(rcu_torture_read,
TP_PROTO(char *rcutorturename, struct rcu_head *rhp),
TP_ARGS(rcutorturename, rhp),
TP_STRUCT__entry(
__field(char *, rcutorturename)
__field(struct rcu_head *, rhp)
),
TP_fast_assign(
__entry->rcutorturename = rcutorturename;
__entry->rhp = rhp;
),
TP_printk("%s torture read %p",
__entry->rcutorturename, __entry->rhp)
);
#else /* #ifdef CONFIG_RCU_TRACE */
#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
@@ -452,6 +477,7 @@ TRACE_EVENT(rcu_batch_end,
#define trace_rcu_invoke_callback(rcuname, rhp) do { } while (0)
#define trace_rcu_invoke_kfree_callback(rcuname, rhp, offset) do { } while (0)
#define trace_rcu_batch_end(rcuname, callbacks_invoked) do { } while (0)
#define trace_rcu_torture_read(rcutorturename, rhp) do { } while (0)
#endif /* #else #ifdef CONFIG_RCU_TRACE */