From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933313AbdABPkT (ORCPT ); Mon, 2 Jan 2017 10:40:19 -0500 Received: from mail-lf0-f66.google.com ([209.85.215.66]:33100 "EHLO mail-lf0-f66.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756016AbdABPkQ (ORCPT ); Mon, 2 Jan 2017 10:40:16 -0500 From: Uladzislau Rezki To: Peter Zijlstra Cc: LKML , Uladzislau 2 Rezki Subject: [RFC 3/3] sched: ignore task_h_load for CPU_NEWLY_IDLE Date: Mon, 2 Jan 2017 16:39:48 +0100 Message-Id: <1483371588-17140-3-git-send-email-urezki@gmail.com> X-Mailer: git-send-email 2.1.4 In-Reply-To: <1483371588-17140-1-git-send-email-urezki@gmail.com> References: <1483371588-17140-1-git-send-email-urezki@gmail.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Uladzislau 2 Rezki A load balancer calculates imbalance factor for particular shed domain and tries to steal up the prescribed amount of weighted load. However, a small imbalance factor would sometimes prevent us from stealing any tasks at all. When a CPU is newly idle, it should steal first task which passes a migration criteria. Signed-off-by: Uladzislau 2 Rezki --- kernel/sched/fair.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 9ebcab1..00b63cc 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -6534,8 +6534,9 @@ static int detach_tasks(struct lb_env *env) if (sched_feat(LB_MIN) && load < 16 && !env->sd->nr_balance_failed) goto next; - if ((load / 2) > env->imbalance) - goto next; + if (env->idle != CPU_NEWLY_IDLE) + if ((load / 2) > env->imbalance) + goto next; detach_task(p, env); list_add(&p->se.group_node, &env->tasks); -- 2.1.4