From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932280AbaGWFLk (ORCPT ); Wed, 23 Jul 2014 01:11:40 -0400 Received: from mail-yk0-f176.google.com ([209.85.160.176]:43967 "EHLO mail-yk0-f176.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1757502AbaGWFLK (ORCPT ); Wed, 23 Jul 2014 01:11:10 -0400 From: Pranith Kumar To: "Paul E. McKenney" , Josh Triplett , Steven Rostedt , Mathieu Desnoyers , Lai Jiangshan , linux-kernel@vger.kernel.org (open list:READ-COPY UPDATE...) Subject: [PATCH 15/16] rcu: Check for a nocb cpu before trying to spawn nocb threads Date: Wed, 23 Jul 2014 01:09:52 -0400 Message-Id: <1406092194-13004-16-git-send-email-bobby.prani@gmail.com> X-Mailer: git-send-email 2.0.0.rc2 In-Reply-To: <1406092194-13004-1-git-send-email-bobby.prani@gmail.com> References: <1406092194-13004-1-git-send-email-bobby.prani@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org This commit tries to spawn nocb kthreads only when the CPU is marked as a nocb cpu. This is a minor optimization. Signed-off-by: Pranith Kumar --- kernel/rcu/tree_plugin.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/kernel/rcu/tree_plugin.h b/kernel/rcu/tree_plugin.h index 541c776..8abff0a 100644 --- a/kernel/rcu/tree_plugin.h +++ b/kernel/rcu/tree_plugin.h @@ -1490,7 +1490,8 @@ static void rcu_prepare_kthreads(int cpu) return; rcu_spawn_one_boost_kthread(rcu_state_p, rnp); - rcu_spawn_all_nocb_kthreads(cpu); + if (rcu_is_nocb_cpu(cpu)) + rcu_spawn_all_nocb_kthreads(cpu); } #else /* #ifdef CONFIG_RCU_BOOST */ -- 2.0.0.rc2