linux-kernel - [PATCH RFC tip/core/rcu 4/5] rcu: Wake grace-period kthread at end of expedited grace period

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Message-Id: <1435700910-9104-4-git-send-email-paulmck@linux.vnet.ibm.com>
Date:	Tue, 30 Jun 2015 14:48:29 -0700
From:	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-kernel@...r.kernel.org
Cc:	mingo@...nel.org, laijs@...fujitsu.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,
	dvhart@...ux.intel.com, fweisbec@...il.com, oleg@...hat.com,
	bobby.prani@...il.com,
	"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
Subject: [PATCH RFC tip/core/rcu 4/5] rcu: Wake grace-period kthread at end of expedited grace period

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

Let the expedited grace period confer its lower latency onto any
normal grace period that is in progress.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
---
 kernel/rcu/tree.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c
index 5365f6332a60..308b6acb4260 100644
--- a/kernel/rcu/tree.c
+++ b/kernel/rcu/tree.c
@@ -3507,6 +3507,8 @@ void synchronize_sched_expedited(void)
 	rcu_exp_gp_seq_end(rsp);
 	mutex_unlock(&rnp->exp_funnel_mutex);
 	smp_mb(); /* ensure subsequent action seen after grace period. */
+	if (rsp->gp_kthread && rcu_gp_in_progress(rsp))
+		wake_up(&rsp->gp_wq);
 
 	put_online_cpus();
 }
-- 
1.8.1.5

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