linux-kernel - [PATCH tip/core/rcu 08/10] rcu/nocb: Reduce contention at no-CBs invocation-done time

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Message-Id: <20190801231636.23115-8-paulmck@linux.ibm.com>
Date:   Thu,  1 Aug 2019 16:16:33 -0700
From:   "Paul E. McKenney" <paulmck@...ux.ibm.com>
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 08/10] rcu/nocb: Reduce contention at no-CBs invocation-done time

Currently, nocb_cb_wait() unconditionally acquires the leaf rcu_node
->lock to advance callbacks when done invoking the previous batch.
It does this while holding ->nocb_lock, which means that contention on
the leaf rcu_node ->lock visits itself on the ->nocb_lock.  This commit
therefore makes this lock acquisition conditional, forgoing callback
advancement when the leaf rcu_node ->lock is not immediately available.
(In this case, the no-CBs grace-period kthread will eventually do any
needed callback advancement.)

Signed-off-by: Paul E. McKenney <paulmck@...ux.ibm.com>
---
 kernel/rcu/tree_plugin.h | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h
index a1a2fc9df6d8..7fbf2c4411a1 100644
--- a/kernel/rcu/tree_plugin.h
+++ b/kernel/rcu/tree_plugin.h
@@ -1803,9 +1803,10 @@ static void nocb_cb_wait(struct rcu_data *rdp)
 	local_bh_enable();
 	lockdep_assert_irqs_enabled();
 	rcu_nocb_lock_irqsave(rdp, flags);
-	raw_spin_lock_rcu_node(rnp); /* irqs already disabled. */
-	needwake_gp = rcu_advance_cbs(rdp->mynode, rdp);
-	raw_spin_unlock_rcu_node(rnp); /* irqs remain disabled. */
+	if (raw_spin_trylock_rcu_node(rnp)) { /* irqs already disabled. */
+		needwake_gp = rcu_advance_cbs(rdp->mynode, rdp);
+		raw_spin_unlock_rcu_node(rnp); /* irqs remain disabled. */
+	}
 	if (rcu_segcblist_ready_cbs(&rdp->cblist)) {
 		rcu_nocb_unlock_irqrestore(rdp, flags);
 		if (needwake_gp)
-- 
2.17.1