From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754030Ab1KKODr (ORCPT ); Fri, 11 Nov 2011 09:03:47 -0500 Received: from mailhub.sw.ru ([195.214.232.25]:25292 "EHLO relay.sw.ru" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751949Ab1KKODq (ORCPT ); Fri, 11 Nov 2011 09:03:46 -0500 From: Andrew Vagin To: Ingo Molnar Cc: Peter Zijlstra , linux-kernel@vger.kernel.org, devel@openvz.org Subject: [PATCH] sched: don't call task_group() many times in set_task_rq() Date: Fri, 11 Nov 2011 17:04:00 +0300 Message-Id: <1321020240-3874331-1-git-send-email-avagin@openvz.org> X-Mailer: git-send-email 1.7.1 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It improves perfomance, especially if autogroup enabled. The size of set_task_rq() was 0x180 and now it is 0xa0. Signed-off-by: Andrew Vagin --- kernel/sched.c | 12 ++++++++---- 1 files changed, 8 insertions(+), 4 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index d87c6e5..a740eec 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -766,14 +766,18 @@ static inline struct task_group *task_group(struct task_struct *p) /* Change a task's cfs_rq and parent entity if it moves across CPUs/groups */ static inline void set_task_rq(struct task_struct *p, unsigned int cpu) { +#if defined(CONFIG_FAIR_GROUP_SCHED) || defined(CONFIG_RT_GROUP_SCHED) + struct task_group *tg = task_group(p); +#endif + #ifdef CONFIG_FAIR_GROUP_SCHED - p->se.cfs_rq = task_group(p)->cfs_rq[cpu]; - p->se.parent = task_group(p)->se[cpu]; + p->se.cfs_rq = tg->cfs_rq[cpu]; + p->se.parent = tg->se[cpu]; #endif #ifdef CONFIG_RT_GROUP_SCHED - p->rt.rt_rq = task_group(p)->rt_rq[cpu]; - p->rt.parent = task_group(p)->rt_se[cpu]; + p->rt.rt_rq = tg->rt_rq[cpu]; + p->rt.parent = tg->rt_se[cpu]; #endif } -- 1.7.1