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 CEEE5C77B6E for ; Fri, 31 Mar 2023 00:50:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229844AbjCaAug (ORCPT ); Thu, 30 Mar 2023 20:50:36 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42044 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229830AbjCaAue (ORCPT ); Thu, 30 Mar 2023 20:50:34 -0400 Received: from casper.infradead.org (casper.infradead.org [IPv6:2001:8b0:10b:1236::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BECF410402; Thu, 30 Mar 2023 17:50:24 -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=rYjxplCtfMbIi/IGTqusLvoyxMJu8ljmhg5x/8VsxJk=; b=vwA7Z7yaE4d/xObNIoFTAXyoH7 xuafAfSSueMv7XI0Xv7wTUNirC9xx772GjzqXymDGkqVAHA1diF4Rpt7KeVWRg3yunNiDlxRAyT9A ZPMcA+a5PgfUDG1Mzaji0s06SxAO7+BjVXLK3UcTH26lZ9Diq6u0yk+b8P1Gsm8a/oCywLj0MMzrU bzBYck+zRzsrQhYfK6Q7i6H7grFFX2Z45TBNdccLx/SQg56N0lqeedp+bjEvREjSTWGGDI+qEzuyA SwhdFhciD4/1C/qQSbxNGCflFbtnm3pLd0VEJUncRt7JKD+bR1Iho+u/bmyCAcppB1Jk+wqwPJk8H LBHltCPA==; Received: from willy by casper.infradead.org with local (Exim 4.94.2 #2 (Red Hat Linux)) id 1pi2xg-00AwVc-Ov; Fri, 31 Mar 2023 00:49:48 +0000 Date: Fri, 31 Mar 2023 01:49:48 +0100 From: Matthew Wilcox To: David Dai Cc: "Rafael J. Wysocki" , Viresh Kumar , Rob Herring , Krzysztof Kozlowski , Paolo Bonzini , Jonathan Corbet , Marc Zyngier , Oliver Upton , James Morse , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , Mark Rutland , Lorenzo Pieralisi , Sudeep Holla , Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , kernel-team@android.com, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, linux-doc@vger.kernel.org, linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev Subject: Re: [RFC PATCH 0/6] Improve VM DVFS and task placement behavior Message-ID: References: <20230330224348.1006691-1-davidai@google.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20230330224348.1006691-1-davidai@google.com> Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org On Thu, Mar 30, 2023 at 03:43:35PM -0700, David Dai wrote: > Hi, > > This patch series is a continuation of the talk Saravana gave at LPC 2022 > titled "CPUfreq/sched and VM guest workload problems" [1][2][3]. The gist > of the talk is that workloads running in a guest VM get terrible task > placement and DVFS behavior when compared to running the same workload in DVFS? Some new filesystem, perhaps? > the host. Effectively, no EAS for threads inside VMs. This would make power EAS? Two unfamiliar and undefined acronyms in your opening paragraph. You're not making me want to read the rest of your opus.