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 C5FEAC4167B for ; Mon, 13 Nov 2023 12:26:39 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229814AbjKMM0k (ORCPT ); Mon, 13 Nov 2023 07:26:40 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:55570 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229650AbjKMM0j (ORCPT ); Mon, 13 Nov 2023 07:26:39 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C64BD5D; Mon, 13 Nov 2023 04:26:36 -0800 (PST) Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB5F7C433C7; Mon, 13 Nov 2023 12:26:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1699878395; bh=FPIp+cqgIY0PhpYyM/+c1zOLJtRcC1R0KvXB0ib9TbM=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=hUeaWkms3Y9wLVCS+wsQEym5p9vIWKWEEfs61vzfTTz/4ckuyv7Z2NYNlaIKSWTb1 ara4RM1NgeVu6zM6KFga2nVJPpZOZq47M56XPtp26sZj17W8KB5N2P6ZsTAvF7BLhd CZq/APnrPcNCshIdv/bekTECw+P+3Jn6e/LJP4v0PhquPQVBA219VAKxoPnZQDCcKr zkLmncAPM2b1WAXUu/9x6Rs/s6JN36k7OlKf3CZXRgnGKkcUISgLFOiic/MZzWRaNX DPEyfuXeAHTfRXUc1A0VhXUx0OYbCIsfLXAyS/28IeWCm8Bb0J41hTWKUwWWU+wokb MyEwfPgyUYmWg== Received: from sofa.misterjones.org ([185.219.108.64] helo=goblin-girl.misterjones.org) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.95) (envelope-from ) id 1r2W1R-00Cfx5-G5; Mon, 13 Nov 2023 12:26:33 +0000 Date: Mon, 13 Nov 2023 12:26:33 +0000 Message-ID: <867cml2612.wl-maz@kernel.org> From: Marc Zyngier To: Hongyan Xia Cc: David Dai , "Rafael J. Wysocki" , Viresh Kumar , Rob Herring , Krzysztof Kozlowski , Conor Dooley , Sudeep Holla , Saravana Kannan , Quentin Perret , Masami Hiramatsu , Will Deacon , Peter Zijlstra , Vincent Guittot , Oliver Upton , Dietmar Eggemann , Pavan Kondeti , Gupta Pankaj , Mel Gorman , kernel-team@android.com, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v4 0/2] Improve VM CPUfreq and task placement behavior In-Reply-To: <438c96fd-bcb0-4699-b81b-40f800cedca0@arm.com> References: <20231111014933.1934562-1-davidai@google.com> <438c96fd-bcb0-4699-b81b-40f800cedca0@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/29.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: hongyan.xia2@arm.com, davidai@google.com, rafael@kernel.org, viresh.kumar@linaro.org, robh+dt@kernel.org, krzysztof.kozlowski+dt@linaro.org, conor+dt@kernel.org, sudeep.holla@arm.com, saravanak@google.com, qperret@google.com, mhiramat@google.com, will@kernel.org, peterz@infradead.org, vincent.guittot@linaro.org, oliver.upton@linux.dev, dietmar.eggemann@arm.com, quic_pkondeti@quicinc.com, pankaj.gupta@amd.com, mgorman@suse.de, kernel-team@android.com, linux-pm@vger.kernel.org, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 13 Nov 2023 12:20:29 +0000, Hongyan Xia wrote: > > Also, my knowledge with KVM is limited. May I know where the vCPU fork > happens? Can't you just set the p->sched_reset_on_fork flag on fork to > not carry forward the uclamp values? There is no "vCPU fork". The vcpu is a VMM (qemu, crosvm, kvmtool) thread, nothing else. M. -- Without deviation from the norm, progress is not possible.