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[2620:137:e000::1:18]) by mx.google.com with ESMTPS id z8-20020a17090a540800b001df6ce033fasi6064901pjh.57.2022.05.18.03.38.16 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 18 May 2022 03:38:16 -0700 (PDT) Received-SPF: pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) client-ip=2620:137:e000::1:18; Authentication-Results: mx.google.com; dkim=pass header.i=@infradead.org header.s=casper.20170209 header.b=Ap6baPuJ; spf=pass (google.com: domain of linux-kernel-owner@vger.kernel.org designates 2620:137:e000::1:18 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by lindbergh.monkeyblade.net (Postfix) with ESMTP id B86135E772; Wed, 18 May 2022 03:22:11 -0700 (PDT) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235083AbiERKWD (ORCPT + 99 others); Wed, 18 May 2022 06:22:03 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:38280 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235080AbiERKV7 (ORCPT ); Wed, 18 May 2022 06:21:59 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 80D085D1AB for ; Wed, 18 May 2022 03:21:58 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=casper.20170209; h=In-Reply-To:Content-Type:MIME-Version: References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=D5su1PH4MS8/+9/EKhxkkfjE2by65ByPf20zlRylZEo=; b=Ap6baPuJktqxMXClC/fPPIRN/4 ofhBooysvBqIBE80O+Oga4syoGCoyWCnnhxhSnr3XW2Jd252dS6ixpk0c2kPEyeg8m4uyRQglYnAv tIbdSEXFxSMwHzjJvQCP1XVckp6mEO0RJ9qeJI+80ni+057kYS64yaN/XUao9w9BEfzL3zhB9EiLJ k3M/nlfw5GhkwsWOLtxkYvJOIBk3XPCWw4MN3BtUdWddWyXqRNsy3Ygw0Tv1pOMHIduxk77KEqw2T bH91MEzqOE0ZHZv72pb+VkOmIhQaOzQiXYoKAEVW1aGfaLpiFBo+FUY/YuA7xiwXMyhv5mKsmJUrP drM8J4Rw==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=worktop.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94.2 #2 (Red Hat Linux)) id 1nrGoH-00BgfE-Tm; Wed, 18 May 2022 10:21:42 +0000 Received: by worktop.programming.kicks-ass.net (Postfix, from userid 1000) id 2FD69980DFF; Wed, 18 May 2022 12:21:40 +0200 (CEST) Date: Wed, 18 May 2022 12:21:40 +0200 From: Peter Zijlstra To: Fam Zheng Cc: linux-kernel@vger.kernel.org, Steven Rostedt , Ben Segall , Daniel Bristot de Oliveira , Dietmar Eggemann , zhouchengming@bytedance.com, Vincent Guittot , fam@euphon.net, Mel Gorman , Ingo Molnar , songmuchun@bytedance.com, Juri Lelli Subject: Re: [RFC PATCH] sched: Enable root level cgroup bandwidth control Message-ID: <20220518102140.GF10117@worktop.programming.kicks-ass.net> References: <20220518100841.1497391-1-fam.zheng@bytedance.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20220518100841.1497391-1-fam.zheng@bytedance.com> X-Spam-Status: No, score=-2.0 required=5.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,RDNS_NONE,SPF_HELO_NONE,T_SCC_BODY_TEXT_LINE autolearn=no autolearn_force=no version=3.4.6 X-Spam-Checker-Version: SpamAssassin 3.4.6 (2021-04-09) on lindbergh.monkeyblade.net Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Wed, May 18, 2022 at 11:08:41AM +0100, Fam Zheng wrote: > In the data center there sometimes comes a need to throttle down a > server, Why?