linux-kernel - [PATCH tip/core/rcu 6/8] rcu: Update descriptions for rcu_nocb

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Message-Id: <20191003013305.12854-6-paulmck@kernel.org>
Date:   Wed,  2 Oct 2019 18:33:03 -0700
From:   paulmck@...nel.org
To:     rcu@...r.kernel.org
Cc:     linux-kernel@...r.kernel.org, mingo@...nel.org,
        jiangshanlai@...il.com, dipankar@...ibm.com,
        akpm@...ux-foundation.org, mathieu.desnoyers@...icios.com,
        josh@...htriplett.org, tglx@...utronix.de, peterz@...radead.org,
        rostedt@...dmis.org, dhowells@...hat.com, edumazet@...gle.com,
        fweisbec@...il.com, oleg@...hat.com, joel@...lfernandes.org,
        "Paul E. McKenney" <paulmck@...ux.ibm.com>
Subject: [PATCH tip/core/rcu 6/8] rcu: Update descriptions for rcu_nocb_wake tracepoint

From: "Paul E. McKenney" <paulmck@...ux.ibm.com>

Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
---
 include/trace/events/rcu.h | 35 +++++++++++++++++++++--------------
 1 file changed, 21 insertions(+), 14 deletions(-)

diff --git a/include/trace/events/rcu.h b/include/trace/events/rcu.h
index afa8985..4609f2e 100644
--- a/include/trace/events/rcu.h
+++ b/include/trace/events/rcu.h
@@ -258,20 +258,27 @@ TRACE_EVENT_RCU(rcu_exp_funnel_lock,
  * the number of the offloaded CPU are extracted.  The third and final
  * argument is a string as follows:
  *
- *	"WakeEmpty": Wake rcuo kthread, first CB to empty list.
- *	"WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
- *	"WakeOvf": Wake rcuo kthread, CB list is huge.
- *	"WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
- *	"WakeNot": Don't wake rcuo kthread.
- *	"WakeNotPoll": Don't wake rcuo kthread because it is polling.
- *	"DeferredWake": Carried out the "IsDeferred" wakeup.
- *	"Poll": Start of new polling cycle for rcu_nocb_poll.
- *	"Sleep": Sleep waiting for GP for !rcu_nocb_poll.
- *	"CBSleep": Sleep waiting for CBs for !rcu_nocb_poll.
- *	"WokeEmpty": rcuo kthread woke to find empty list.
- *	"WokeNonEmpty": rcuo kthread woke to find non-empty list.
- *	"WaitQueue": Enqueue partially done, timed wait for it to complete.
- *	"WokeQueue": Partial enqueue now complete.
+ * "AlreadyAwake": The to-be-awakened rcuo kthread is already awake.
+ * "Bypass": rcuo GP kthread sees non-empty ->nocb_bypass.
+ * "CBSleep": rcuo CB kthread sleeping waiting for CBs.
+ * "Check": rcuo GP kthread checking specified CPU for work.
+ * "DeferredWake": Timer expired or polled check, time to wake.
+ * "DoWake": The to-be-awakened rcuo kthread needs to be awakened.
+ * "EndSleep": Done waiting for GP for !rcu_nocb_poll.
+ * "FirstBQ": New CB to empty ->nocb_bypass (->cblist maybe non-empty).
+ * "FirstBQnoWake": FirstBQ plus rcuo kthread need not be awakened.
+ * "FirstBQwake": FirstBQ plus rcuo kthread must be awakened.
+ * "FirstQ": New CB to empty ->cblist (->nocb_bypass maybe non-empty).
+ * "NeedWaitGP": rcuo GP kthread must wait on a grace period.
+ * "Poll": Start of new polling cycle for rcu_nocb_poll.
+ * "Sleep": Sleep waiting for GP for !rcu_nocb_poll.
+ * "Timer": Deferred-wake timer expired.
+ * "WakeEmptyIsDeferred": Wake rcuo kthread later, first CB to empty list.
+ * "WakeEmpty": Wake rcuo kthread, first CB to empty list.
+ * "WakeNot": Don't wake rcuo kthread.
+ * "WakeNotPoll": Don't wake rcuo kthread because it is polling.
+ * "WakeOvfIsDeferred": Wake rcuo kthread later, CB list is huge.
+ * "WokeEmpty": rcuo CB kthread woke to find empty list.
  */
 TRACE_EVENT_RCU(rcu_nocb_wake,
 
-- 
2.9.5