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=-5.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS,MAILING_LIST_MULTI, SPF_HELO_NONE,SPF_PASS autolearn=no 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 86006C433ED for ; Fri, 21 May 2021 14:06:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 61593613C8 for ; Fri, 21 May 2021 14:06:13 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236558AbhEUOHe (ORCPT ); Fri, 21 May 2021 10:07:34 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:36542 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232170AbhEUOHc (ORCPT ); Fri, 21 May 2021 10:07:32 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 06E72C061574 for ; Fri, 21 May 2021 07:06:09 -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=PhExRqklmWNSYFA2NeQrWGtVr2foNSqvGdEdZMWTZOA=; b=M7PpjtsImOdcUp+qdQAftJFJOd wX7zwtnH9sgoMdTcQKyphoWa76Q/3FJCpCW6OPOwF+FMAA4Ni+qax4qxFiK1ZcIiEhGOJl91UgdLe +pExS2Rv1uU9zL6ANoP9dPUe5OdOk9X+EEiHxNiUPADI7q2fcz26KQSTudALNkacVTSmihAVTdX+I 7Z3vjP3jeDdYZNHluYcG1Ty83RBuM1V7KDmPhxfqeGlqoCQDOjutCpGTC6HrCp77ISztFQJty+6uD NT98tHGWoudkOw1GSQRJLPmeRbJwBOtpQwteNRnEbBV9dfevimEEZfE8xCjCt6FWsxLrPtstCUphp CL3aR5Cg==; Received: from j217100.upc-j.chello.nl ([24.132.217.100] helo=noisy.programming.kicks-ass.net) by casper.infradead.org with esmtpsa (Exim 4.94 #2 (Red Hat Linux)) id 1lk5i8-00H0p6-2y; Fri, 21 May 2021 14:01:37 +0000 Received: from hirez.programming.kicks-ass.net (hirez.programming.kicks-ass.net [192.168.1.225]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits)) (Client did not present a certificate) by noisy.programming.kicks-ass.net (Postfix) with ESMTPS id B2E743001D0; Fri, 21 May 2021 16:01:07 +0200 (CEST) Received: by hirez.programming.kicks-ass.net (Postfix, from userid 1000) id A1BAA30D63CA1; Fri, 21 May 2021 16:01:07 +0200 (CEST) Date: Fri, 21 May 2021 16:01:07 +0200 From: Peter Zijlstra To: Huaixin Chang Cc: bsegall@google.com, dietmar.eggemann@arm.com, dtcccc@linux.alibaba.com, juri.lelli@redhat.com, khlebnikov@yandex-team.ru, linux-kernel@vger.kernel.org, mgorman@suse.de, mingo@redhat.com, odin@uged.al, odin@ugedal.com, pauld@redhead.com, pjt@google.com, rostedt@goodmis.org, shanpeic@linux.alibaba.com, tj@kernel.org, vincent.guittot@linaro.org, xiyou.wangcong@gmail.com Subject: Re: [PATCH v5 2/3] sched/fair: Add cfs bandwidth burst statistics Message-ID: References: <20210520123419.8039-1-changhuaixin@linux.alibaba.com> <20210520123419.8039-3-changhuaixin@linux.alibaba.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20210520123419.8039-3-changhuaixin@linux.alibaba.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Thu, May 20, 2021 at 08:34:18PM +0800, Huaixin Chang wrote: > When using cfs_b and meeting with some throttled periods, users shall > use burst buffer to allow bursty workloads. Apart from configuring some > burst buffer and watch whether throttled periods disappears, some > statistics on burst buffer using are also helpful. Thus expose the > following statistics into cpu.stat file: > Helpful how.. the above is a bunch of words without any actual justification for any of this.