linux-kernel - [tip:core/rcu] rcu: Enable synchronize_sched

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Date:	Tue, 10 Nov 2009 22:27:58 GMT
From:	"tip-bot for Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, paulmck@...ux.vnet.ibm.com,
	hpa@...or.com, mingo@...hat.com, tglx@...utronix.de, mingo@...e.hu
Subject: [tip:core/rcu] rcu: Enable synchronize_sched_expedited() fastpath

Commit-ID:  956539b75921f561c0956c22d37320780e8b4ba1
Gitweb:     http://git.kernel.org/tip/956539b75921f561c0956c22d37320780e8b4ba1
Author:     Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
AuthorDate: Tue, 10 Nov 2009 13:37:20 -0800
Committer:  Ingo Molnar <mingo@...e.hu>
CommitDate: Tue, 10 Nov 2009 22:48:49 +0100

rcu: Enable synchronize_sched_expedited() fastpath

This patch adds a counter increment to enable tasks to actually
take the synchronize_sched_expedited() function's fastpath.

Signed-off-by: Paul E. McKenney <paulmck@...ux.vnet.ibm.com>
Cc: laijs@...fujitsu.com
Cc: dipankar@...ibm.com
Cc: mathieu.desnoyers@...ymtl.ca
Cc: josh@...htriplett.org
Cc: dvhltc@...ibm.com
Cc: niv@...ibm.com
Cc: peterz@...radead.org
Cc: rostedt@...dmis.org
Cc: Valdis.Kletnieks@...edu
Cc: dhowells@...hat.com
LKML-Reference: <1257889042435-git-send-email->
Signed-off-by: Ingo Molnar <mingo@...e.hu>
---
 kernel/sched.c |    1 +
 1 files changed, 1 insertions(+), 0 deletions(-)

diff --git a/kernel/sched.c b/kernel/sched.c
index 76c0e96..e69fee4 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -10865,6 +10865,7 @@ void synchronize_sched_expedited(void)
 		spin_unlock_irqrestore(&rq->lock, flags);
 	}
 	rcu_expedited_state = RCU_EXPEDITED_STATE_IDLE;
+	synchronize_sched_expedited_count++;
 	mutex_unlock(&rcu_sched_expedited_mutex);
 	put_online_cpus();
 	if (need_full_sync)
--
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