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=-0.7 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED 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 61AE9C43613 for ; Fri, 21 Jun 2019 13:26:16 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 39654208C3 for ; Fri, 21 Jun 2019 13:26:16 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726083AbfFUN0P (ORCPT ); Fri, 21 Jun 2019 09:26:15 -0400 Received: from foss.arm.com ([217.140.110.172]:60542 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725985AbfFUN0O (ORCPT ); Fri, 21 Jun 2019 09:26:14 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 2D0AA344; Fri, 21 Jun 2019 06:26:14 -0700 (PDT) Received: from [10.1.194.37] (e113632-lin.cambridge.arm.com [10.1.194.37]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id CBC2A3F246; Fri, 21 Jun 2019 06:26:12 -0700 (PDT) Subject: Re: [PATCH 0/5] BT scheduling class To: Peter Zijlstra , xiaoggchen@tencent.com Cc: jasperwang@tencent.com, heddchen@tencent.com, mingo@redhat.com, linux-kernel@vger.kernel.org, tj@kernel.org, lizefan@huawei.com, hannes@cmpxchg.org, cgroups@vger.kernel.org, viresh.kumar@linaro.org References: <1561103157-11246-1-git-send-email-xiaoggchen@tencent.com> <20190621130316.GK3436@hirez.programming.kicks-ass.net> From: Valentin Schneider Message-ID: <6a81a564-9d89-f01d-15b8-e07f092cc5f1@arm.com> Date: Fri, 21 Jun 2019 14:26:11 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190621130316.GK3436@hirez.programming.kicks-ass.net> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 21/06/2019 14:03, Peter Zijlstra wrote: > On Fri, Jun 21, 2019 at 03:45:52PM +0800, xiaoggchen@tencent.com wrote: > >> First only server application exists in the system and the success >> rate is 99.998% and the average cpu use is only 25%. > > Have you guys looked at this series: > > https://lkml.kernel.org/r/cover.1556182964.git.viresh.kumar@linaro.org > > Sort of a shot in the dark here, but I wonder if task stealing [1] could help as well? IIRC Steve had some pretty good CPU utilization improvements with his series. FWIW I have a somewhat recent rebase of CFS stealing laying around at [2]. [1]: https://lore.kernel.org/lkml/1544131696-2888-1-git-send-email-steven.sistare@oracle.com/ [2]: http://www.linux-arm.org/git?p=linux-vs.git;a=shortlog;h=refs/heads/mainline/cfs-stealing/v4-rebase