From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752125AbcKIGgN (ORCPT ); Wed, 9 Nov 2016 01:36:13 -0500 Received: from LGEAMRELO11.lge.com ([156.147.23.51]:49392 "EHLO lgeamrelo11.lge.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751036AbcKIGgL (ORCPT ); Wed, 9 Nov 2016 01:36:11 -0500 X-Original-SENDERIP: 156.147.1.125 X-Original-MAILFROM: byungchul.park@lge.com X-Original-SENDERIP: 10.177.222.33 X-Original-MAILFROM: byungchul.park@lge.com From: Byungchul Park To: paulmck@linux.vnet.ibm.com, josh@joshtriplett.org, rostedt@goodmis.org, mathieu.desnoyers@efficios.com, jiangshanlai@gmail.com Cc: linux-kernel@vger.kernel.org Subject: [PATCH 2/2] rcu: Force resched_cpu when jiffies >= rcu_state.jiffies_resched Date: Wed, 9 Nov 2016 15:32:15 +0900 Message-Id: <1478673135-25509-2-git-send-email-byungchul.park@lge.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1478673135-25509-1-git-send-email-byungchul.park@lge.com> References: <1478673135-25509-1-git-send-email-byungchul.park@lge.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Currently rcu code forces CPU into scheduler when jiffies >= rcu_state.gp_start + jiffies_till_sched_qs, via resched_cpu(). It would be better to force CPU into scheduler when jiffies >= rcu_state.jiffies_resched, too. Signed-off-by: Byungchul Park --- kernel/rcu/tree.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/kernel/rcu/tree.c b/kernel/rcu/tree.c index d8e8859..287f468 100644 --- a/kernel/rcu/tree.c +++ b/kernel/rcu/tree.c @@ -1217,11 +1217,10 @@ static int rcu_implicit_dynticks_qs(struct rcu_data *rdp, READ_ONCE(*rcrmp) + rdp->rsp->flavor_mask); } rdp->rsp->jiffies_resched += 5; /* Re-enable beating. */ - } - /* And if it has been a really long time, kick the CPU as well. */ - if (ULONG_CMP_GE(jiffies, rdp->rsp->gp_start + jiffies_till_sched_qs)) + /* And if it has been a really long time, kick the CPU as well. */ resched_cpu(rdp->cpu); /* Force CPU into scheduler. */ + } return 0; } -- 1.9.1