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rcu: Add tracing for _rcu_barrier()

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This commit adds event tracing for _rcu_barrier() execution.  This
is defined only if RCU_TRACE=y.

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
2012-05-23 18:47:05 -07:00
committed by Paul E. McKenney
parent cf3a9c4842
commit a83eff0a82
2 changed files with 73 additions and 1 deletions
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45
include/trace/events/rcu.h
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@@ -541,6 +541,50 @@ TRACE_EVENT(rcu_torture_read,
__entry->rcutorturename, __entry->rhp)
);
/*
* Tracepoint for _rcu_barrier() execution. The string "s" describes
* the _rcu_barrier phase:
* "Begin": rcu_barrier_callback() started.
* "Check": rcu_barrier_callback() checking for piggybacking.
* "EarlyExit": rcu_barrier_callback() piggybacked, thus early exit.
* "Inc1": rcu_barrier_callback() piggyback check counter incremented.
* "Offline": rcu_barrier_callback() found offline CPU
* "OnlineQ": rcu_barrier_callback() found online CPU with callbacks.
* "OnlineNQ": rcu_barrier_callback() found online CPU, no callbacks.
* "IRQ": An rcu_barrier_callback() callback posted on remote CPU.
* "CB": An rcu_barrier_callback() invoked a callback, not the last.
* "LastCB": An rcu_barrier_callback() invoked the last callback.
* "Inc2": rcu_barrier_callback() piggyback check counter incremented.
* The "cpu" argument is the CPU or -1 if meaningless, the "cnt" argument
* is the count of remaining callbacks, and "done" is the piggybacking count.
*/
TRACE_EVENT(rcu_barrier,
TP_PROTO(char *rcuname, char *s, int cpu, int cnt, unsigned long done),
TP_ARGS(rcuname, s, cpu, cnt, done),
TP_STRUCT__entry(
__field(char *, rcuname)
__field(char *, s)
__field(int, cpu)
__field(int, cnt)
__field(unsigned long, done)
),
TP_fast_assign(
__entry->rcuname = rcuname;
__entry->s = s;
__entry->cpu = cpu;
__entry->cnt = cnt;
__entry->done = done;
),
TP_printk("%s %s cpu %d remaining %d # %lu",
__entry->rcuname, __entry->s, __entry->cpu, __entry->cnt,
__entry->done)
);
#else /* #ifdef CONFIG_RCU_TRACE */
#define trace_rcu_grace_period(rcuname, gpnum, gpevent) do { } while (0)
@@ -564,6 +608,7 @@ TRACE_EVENT(rcu_torture_read,
#define trace_rcu_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
do { } while (0)
#define trace_rcu_torture_read(rcutorturename, rhp) do { } while (0)
#define trace_rcu_barrier(name, s, cpu, cnt, done) do { } while (0)
#endif /* #else #ifdef CONFIG_RCU_TRACE */