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authorPaul E. McKenney <paul.mckenney@linaro.org>2011-12-08 04:32:40 +0400
committerPaul E. McKenney <paulmck@linux.vnet.ibm.com>2011-12-11 22:32:22 +0400
commit4968c300e1fa5389fdf1f1ebd8b8e4aec9aa4a9e (patch)
tree3424a8c3d2543096acad7319ec57fa8f62813620 /include/trace
parent101db7b41d8d6c070278bca1f7bce814ecbf781d (diff)
downloadlinux-4968c300e1fa5389fdf1f1ebd8b8e4aec9aa4a9e.tar.xz
rcu: Augment rcu_batch_end tracing for idle and callback state
The current rcu_batch_end event trace records only the name of the RCU flavor and the total number of callbacks that remain queued on the current CPU. This is insufficient for testing and tuning the new dyntick-idle RCU_FAST_NO_HZ code, so this commit adds idle state along with whether or not any of the callbacks that were ready to invoke at the beginning of rcu_do_batch() are still queued. Signed-off-by: Paul E. McKenney <paul.mckenney@linaro.org> Signed-off-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com>
Diffstat (limited to 'include/trace')
-rw-r--r--include/trace/events/rcu.h38
1 files changed, 29 insertions, 9 deletions
diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index c75418c3ccb8..d2d88bed891b 100644
--- a/include/trace/events/rcu.h
+++ b/include/trace/events/rcu.h
@@ -461,27 +461,46 @@ TRACE_EVENT(rcu_invoke_kfree_callback,
/*
* Tracepoint for exiting rcu_do_batch after RCU callbacks have been
- * invoked. The first argument is the name of the RCU flavor and
- * the second argument is number of callbacks actually invoked.
+ * invoked. The first argument is the name of the RCU flavor,
+ * the second argument is number of callbacks actually invoked,
+ * the third argument (cb) is whether or not any of the callbacks that
+ * were ready to invoke at the beginning of this batch are still
+ * queued, the fourth argument (nr) is the return value of need_resched(),
+ * the fifth argument (iit) is 1 if the current task is the idle task,
+ * and the sixth argument (risk) is the return value from
+ * rcu_is_callbacks_kthread().
*/
TRACE_EVENT(rcu_batch_end,
- TP_PROTO(char *rcuname, int callbacks_invoked),
+ TP_PROTO(char *rcuname, int callbacks_invoked,
+ bool cb, bool nr, bool iit, bool risk),
- TP_ARGS(rcuname, callbacks_invoked),
+ TP_ARGS(rcuname, callbacks_invoked, cb, nr, iit, risk),
TP_STRUCT__entry(
__field(char *, rcuname)
__field(int, callbacks_invoked)
+ __field(bool, cb)
+ __field(bool, nr)
+ __field(bool, iit)
+ __field(bool, risk)
),
TP_fast_assign(
__entry->rcuname = rcuname;
__entry->callbacks_invoked = callbacks_invoked;
- ),
-
- TP_printk("%s CBs-invoked=%d",
- __entry->rcuname, __entry->callbacks_invoked)
+ __entry->cb = cb;
+ __entry->nr = nr;
+ __entry->iit = iit;
+ __entry->risk = risk;
+ ),
+
+ TP_printk("%s CBs-invoked=%d idle=%c%c%c%c",
+ __entry->rcuname, __entry->callbacks_invoked,
+ __entry->cb ? 'C' : '.',
+ __entry->nr ? 'S' : '.',
+ __entry->iit ? 'I' : '.',
+ __entry->risk ? 'R' : '.')
);
/*
@@ -524,7 +543,8 @@ TRACE_EVENT(rcu_torture_read,
#define trace_rcu_batch_start(rcuname, qlen, blimit) do { } while (0)
#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_batch_end(rcuname, callbacks_invoked, cb, nr, iit, risk) \
+ do { } while (0)
#define trace_rcu_torture_read(rcutorturename, rhp) do { } while (0)
#endif /* #else #ifdef CONFIG_RCU_TRACE */