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 Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 999A1C433EF for ; Wed, 8 Dec 2021 14:50:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235482AbhLHOyG (ORCPT ); Wed, 8 Dec 2021 09:54:06 -0500 Received: from mx1.didiglobal.com ([36.110.17.22]:30657 "HELO mailgate02.didichuxing.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with SMTP id S235471AbhLHOyF (ORCPT ); Wed, 8 Dec 2021 09:54:05 -0500 Received: from mail.didiglobal.com (unknown [172.20.15.13]) by mailgate02.didichuxing.com (Maildata Gateway V2.8) with ESMTP id 1D2186006D20B; Wed, 8 Dec 2021 22:50:31 +0800 (CST) Received: from BJSGEXMBX12.didichuxing.com (172.20.15.142) by BJSGEXMBX04.didichuxing.com (172.20.15.134) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 8 Dec 2021 22:50:30 +0800 Received: from localhost.localdomain (172.20.16.101) by BJSGEXMBX12.didichuxing.com (172.20.15.142) with Microsoft SMTP Server (TLS) id 15.0.1497.2; Wed, 8 Dec 2021 22:50:30 +0800 X-MD-Sfrom: wanghonglei@didiglobal.com X-MD-SrcIP: 172.20.15.13 From: Honglei Wang To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , "Mel Gorman" , Daniel Bristot de Oliveira , CC: Huaixin Chang , Honglei Wang Subject: [PATCH v2 1/3] sched/fair: avoid burst statistic if it's not set Date: Wed, 8 Dec 2021 22:50:18 +0800 Message-ID: <20211208145018.64657-1-wanghonglei@didichuxing.com> X-Mailer: git-send-email 2.24.3 (Apple Git-128) MIME-Version: 1.0 Content-Transfer-Encoding: 7BIT Content-Type: text/plain; charset=US-ASCII X-Originating-IP: [172.20.16.101] X-ClientProxiedBy: BJEXCAS04.didichuxing.com (172.20.36.192) To BJSGEXMBX12.didichuxing.com (172.20.15.142) Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org It's not necessary to do burst associated statistic and calculation for runtime if the burst feature is not set at all. Just return at the very start point if so. Signed-off-by: Honglei Wang --- kernel/sched/fair.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 6e476f6d9435..2cd626c22912 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -4640,6 +4640,11 @@ void __refill_cfs_bandwidth_runtime(struct cfs_bandwidth *cfs_b) if (unlikely(cfs_b->quota == RUNTIME_INF)) return; + if (cfs_b->burst == 0 && cfs_b->runtime_snap == cfs_b->quota) { + cfs_b->runtime = cfs_b->quota; + return; + } + cfs_b->runtime += cfs_b->quota; runtime = cfs_b->runtime_snap - cfs_b->runtime; if (runtime > 0) { -- 2.14.1