From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-11.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH,MAILING_LIST_MULTI, MENTIONS_GIT_HOSTING,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id CCA3BC43603 for ; Tue, 17 Dec 2019 12:40:39 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id A87BC21835 for ; Tue, 17 Dec 2019 12:40:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728358AbfLQMki (ORCPT ); Tue, 17 Dec 2019 07:40:38 -0500 Received: from Galois.linutronix.de ([193.142.43.55]:55280 "EHLO Galois.linutronix.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727935AbfLQMkC (ORCPT ); Tue, 17 Dec 2019 07:40:02 -0500 Received: from [5.158.153.53] (helo=tip-bot2.lab.linutronix.de) by Galois.linutronix.de with esmtpsa (TLS1.2:DHE_RSA_AES_256_CBC_SHA256:256) (Exim 4.80) (envelope-from ) id 1ihC8s-0001ro-UJ; Tue, 17 Dec 2019 13:39:59 +0100 Received: from [127.0.1.1] (localhost [IPv6:::1]) by tip-bot2.lab.linutronix.de (Postfix) with ESMTP id 15EDB1C2A40; Tue, 17 Dec 2019 13:39:53 +0100 (CET) Date: Tue, 17 Dec 2019 12:39:52 -0000 From: "tip-bot2 for Frederic Weisbecker" Reply-to: linux-kernel@vger.kernel.org To: linux-tip-commits@vger.kernel.org Subject: [tip: sched/core] sched: Use fair:prio_changed() instead of ad-hoc implementation Cc: Peter Zijlstra , Frederic Weisbecker , Ingo Molnar , x86 , LKML In-Reply-To: <20191203160106.18806-3-frederic@kernel.org> References: <20191203160106.18806-3-frederic@kernel.org> MIME-Version: 1.0 Message-ID: <157658639295.30329.4061098261424663170.tip-bot2@tip-bot2> X-Mailer: tip-git-log-daemon Robot-ID: Robot-Unsubscribe: Contact to get blacklisted from these emails Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Linutronix-Spam-Score: -1.0 X-Linutronix-Spam-Level: - X-Linutronix-Spam-Status: No , -1.0 points, 5.0 required, ALL_TRUSTED=-1,SHORTCIRCUIT=-0.0001 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org The following commit has been merged into the sched/core branch of tip: Commit-ID: 5443a0be6121d557e12951537e10159e4c61035d Gitweb: https://git.kernel.org/tip/5443a0be6121d557e12951537e10159e4c61035d Author: Frederic Weisbecker AuthorDate: Tue, 03 Dec 2019 17:01:06 +01:00 Committer: Peter Zijlstra CommitterDate: Tue, 17 Dec 2019 13:32:50 +01:00 sched: Use fair:prio_changed() instead of ad-hoc implementation set_user_nice() implements its own version of fair::prio_changed() and therefore misses a specific optimization towards nohz_full CPUs that avoid sending an resched IPI to a reniced task running alone. Use the proper callback instead. Reported-by: Peter Zijlstra Signed-off-by: Frederic Weisbecker Signed-off-by: Peter Zijlstra (Intel) Cc: Ingo Molnar Link: https://lkml.kernel.org/r/20191203160106.18806-3-frederic@kernel.org --- kernel/sched/core.c | 16 ++++++++-------- 1 file changed, 8 insertions(+), 8 deletions(-) diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 90e4b00..15508c2 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -4540,17 +4540,17 @@ void set_user_nice(struct task_struct *p, long nice) p->prio = effective_prio(p); delta = p->prio - old_prio; - if (queued) { + if (queued) enqueue_task(rq, p, ENQUEUE_RESTORE | ENQUEUE_NOCLOCK); - /* - * If the task increased its priority or is running and - * lowered its priority, then reschedule its CPU: - */ - if (delta < 0 || (delta > 0 && task_running(rq, p))) - resched_curr(rq); - } if (running) set_next_task(rq, p); + + /* + * If the task increased its priority or is running and + * lowered its priority, then reschedule its CPU: + */ + p->sched_class->prio_changed(rq, p, old_prio); + out_unlock: task_rq_unlock(rq, p, &rf); }