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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, URIBL_BLOCKED,USER_AGENT_GIT 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 CA9F8C433DF for ; Wed, 20 May 2020 08:01:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9FAAD20708 for ; Wed, 20 May 2020 08:01:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726576AbgETIBe (ORCPT ); Wed, 20 May 2020 04:01:34 -0400 Received: from mail.windriver.com ([147.11.1.11]:56565 "EHLO mail.windriver.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726403AbgETIBe (ORCPT ); Wed, 20 May 2020 04:01:34 -0400 Received: from ALA-HCB.corp.ad.wrs.com (ala-hcb.corp.ad.wrs.com [147.11.189.41]) by mail.windriver.com (8.15.2/8.15.2) with ESMTPS id 04K80btf009933 (version=TLSv1 cipher=DHE-RSA-AES256-SHA bits=256 verify=FAIL); Wed, 20 May 2020 01:00:38 -0700 (PDT) Received: from pek-lpg-core1-vm1.wrs.com (128.224.156.106) by ALA-HCB.corp.ad.wrs.com (147.11.189.41) with Microsoft SMTP Server id 14.3.487.0; Wed, 20 May 2020 01:00:31 -0700 From: To: , , , , , , , CC: Subject: [PATCH] sched/rt: Add borrowing time condition Date: Wed, 20 May 2020 16:09:11 +0800 Message-ID: <20200520080911.27367-1-qiang.zhang@windriver.com> X-Mailer: git-send-email 2.24.1 MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Zhang Qiang Add priority judgment to determine whether to borrow time from neighbors, ensure that the rt_runntime of rt_rq with higher priority tasks is not reduced Signed-off-by: Zhang Qiang --- kernel/sched/rt.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/kernel/sched/rt.c b/kernel/sched/rt.c index 4043abe45459..d2a1acad6687 100644 --- a/kernel/sched/rt.c +++ b/kernel/sched/rt.c @@ -711,8 +711,10 @@ static void do_balance_runtime(struct rt_rq *rt_rq) diff = div_u64((u64)diff, weight); if (rt_rq->rt_runtime + diff > rt_period) diff = rt_period - rt_rq->rt_runtime; - iter->rt_runtime -= diff; - rt_rq->rt_runtime += diff; + if (rt_rq->highest_prio.curr < iter->highest_prio.curr) { + iter->rt_runtime -= diff; + rt_rq->rt_runtime += diff; + } if (rt_rq->rt_runtime == rt_period) { raw_spin_unlock(&iter->rt_runtime_lock); break; -- 2.17.0