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=-3.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, MAILING_LIST_MULTI,SIGNED_OFF_BY,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 B6793C433E0 for ; Wed, 3 Jun 2020 12:04:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 9C7FC20678 for ; Wed, 3 Jun 2020 12:04:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726165AbgFCMEh (ORCPT ); Wed, 3 Jun 2020 08:04:37 -0400 Received: from foss.arm.com ([217.140.110.172]:60686 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1725936AbgFCMEg (ORCPT ); Wed, 3 Jun 2020 08:04:36 -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 08FC331B; Wed, 3 Jun 2020 05:04:36 -0700 (PDT) Received: from e113632-lin (e113632-lin.cambridge.arm.com [10.1.194.46]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id C3D193F305; Wed, 3 Jun 2020 05:04:34 -0700 (PDT) References: <1590597554-370150-1-git-send-email-vincent.donnefort@arm.com> User-agent: mu4e 0.9.17; emacs 26.3 From: Valentin Schneider To: vincent.donnefort@arm.com Cc: mingo@redhat.com, peterz@infradead.org, vincent.guittot@linaro.org, linux-kernel@vger.kernel.org, patrick.bellasi@matbug.net, dietmar.eggemann@arm.com, qais.yousef@arm.com Subject: Re: [PATCH] sched/debug: Add new tracepoints to track util_est In-reply-to: <1590597554-370150-1-git-send-email-vincent.donnefort@arm.com> Date: Wed, 03 Jun 2020 13:04:26 +0100 Message-ID: MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 27/05/20 17:39, vincent.donnefort@arm.com wrote: > From: Vincent Donnefort > > The util_est signals are key elements for EAS task placement and > frequency selection. Having tracepoints to track these signals enables > load-tracking and schedutil testing and/or debugging by a toolkit. > > Signed-off-by: Vincent Donnefort > To put it more bluntly, we can't really do task placement / load tracking testing if util_est is enabled (which reminds me we may want to get rid of the SCHED_FEAT at some point, it's been default on since ~v4.17), since there can be noticeable gaps between util_avg and util_est. Reviewed-by: Valentin Schneider