linux-kernel - [PATCH RFC 3/8] rcu: Add back the cpuend tracepoint

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Date:   Sun, 13 May 2018 20:15:36 -0700
From:   "Joel Fernandes (Google)" <joel@...lfernandes.org>
To:     linux-kernel@...r.kernel.org
Cc:     "Joel Fernandes (Google)" <joel@...lfernandes.org>,
        "Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
        Josh Triplett <josh@...htriplett.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Lai Jiangshan <jiangshanlai@...il.com>, byungchul.park@....com,
        kernel-team@...roid.com
Subject: [PATCH RFC 3/8] rcu: Add back the cpuend tracepoint

Commit be4b8beed87d ("rcu: Move RCU's grace-period-change code to ->gp_seq")
removed the cpuend grace period trace point. This patch adds it back.

Signed-off-by: Joel Fernandes (Google) <joel@...lfernandes.org>
---
 kernel/rcu/tree.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 9ad931bff409..29ccc60bdbfc 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -1774,10 +1774,12 @@ static bool __note_gp_changes(struct rcu_state *rsp, struct rcu_node *rnp,
 
 	/* Handle the ends of any preceding grace periods first. */
 	if (rcu_seq_completed_gp(rdp->gp_seq, rnp->gp_seq) ||
-	    unlikely(READ_ONCE(rdp->gpwrap)))
+	    unlikely(READ_ONCE(rdp->gpwrap))) {
 		ret = rcu_advance_cbs(rsp, rnp, rdp); /* Advance callbacks. */
-	else
+		trace_rcu_grace_period(rsp->name, rdp->gp_seq, TPS("cpuend"));
+	} else {
 		ret = rcu_accelerate_cbs(rsp, rnp, rdp); /* Recent callbacks. */
+	}
 
 	/* Now handle the beginnings of any new-to-this-CPU grace periods. */
 	if (rcu_seq_new_gp(rdp->gp_seq, rnp->gp_seq) ||
-- 
2.17.0.441.gb46fe60e1d-goog