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=-6.8 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 7EE92C18E5C for ; Tue, 10 Mar 2020 13:05:02 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 5722C208E4 for ; Tue, 10 Mar 2020 13:05:02 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583845502; bh=WT1CUfg1qElEb8x9nr6gHgJArDA6hGpqVjQJywTOviU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=QUuvsmsw7BesIVHyJbVlr/4HLClRjS7t7mivoRRMWsY0RB6TLdVgaHMRA9mWaxdu/ SHT6Dfl+PwFKIlueBP4Fy9E/Fz0L3H12WeqhO27BoPxAeAkP3mZMb3qoy2N8Frw6mg FnuxAIKAsdqkVjp7/LCoIvSGnbALAtM5CiRH2HcY= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730662AbgCJNDx (ORCPT ); Tue, 10 Mar 2020 09:03:53 -0400 Received: from mail.kernel.org ([198.145.29.99]:48746 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730659AbgCJNDx (ORCPT ); Tue, 10 Mar 2020 09:03:53 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id BACB1208E4; Tue, 10 Mar 2020 13:03:51 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1583845432; bh=WT1CUfg1qElEb8x9nr6gHgJArDA6hGpqVjQJywTOviU=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fyIjbkCbJPKqszskHSr+20Kk6GHs1ciAtVl+J/nKjMYiIQg1zq1TNTU1hbWTb7uJS CaKzOAVR/E0aYAREwYzn4+S/cK0xDWQWkAFwDBzlgg8Pk83noE3oF2slaDn1lLSyQC l5QDtvamXHQJ3uYOFJQykjvBPZhU7EojzOI6Y/Ww= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Vincent Guittot , Ingo Molnar , Peter Zijlstra , Mel Gorman Subject: [PATCH 5.5 180/189] sched/fair: Fix statistics for find_idlest_group() Date: Tue, 10 Mar 2020 13:40:17 +0100 Message-Id: <20200310123657.801985824@linuxfoundation.org> X-Mailer: git-send-email 2.25.1 In-Reply-To: <20200310123639.608886314@linuxfoundation.org> References: <20200310123639.608886314@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Vincent Guittot commit 289de35984815576793f579ec27248609e75976e upstream. sgs->group_weight is not set while gathering statistics in update_sg_wakeup_stats(). This means that a group can be classified as fully busy with 0 running tasks if utilization is high enough. This path is mainly used for fork and exec. Fixes: 57abff067a08 ("sched/fair: Rework find_idlest_group()") Signed-off-by: Vincent Guittot Signed-off-by: Ingo Molnar Acked-by: Peter Zijlstra Acked-by: Mel Gorman Link: https://lore.kernel.org/r/20200218144534.4564-1-vincent.guittot@linaro.org Signed-off-by: Greg Kroah-Hartman --- kernel/sched/fair.c | 2 ++ 1 file changed, 2 insertions(+) --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -8315,6 +8315,8 @@ static inline void update_sg_wakeup_stat sgs->group_capacity = group->sgc->capacity; + sgs->group_weight = group->group_weight; + sgs->group_type = group_classify(sd->imbalance_pct, group, sgs); /*