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=-13.8 required=3.0 tests=BAYES_00, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS autolearn=unavailable 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 55296C47097 for ; Thu, 3 Jun 2021 14:07:05 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 3F1C0613F4 for ; Thu, 3 Jun 2021 14:07:05 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231578AbhFCOIt (ORCPT ); Thu, 3 Jun 2021 10:08:49 -0400 Received: from foss.arm.com ([217.140.110.172]:42282 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S230114AbhFCOIs (ORCPT ); Thu, 3 Jun 2021 10:08:48 -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 6896011FB; Thu, 3 Jun 2021 07:07:03 -0700 (PDT) Received: from e120325.arm.com (unknown [10.57.85.170]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 57A473F73D; Thu, 3 Jun 2021 07:07:01 -0700 (PDT) From: Beata Michalska To: linux-kernel@vger.kernel.org Cc: peterz@infradead.org, mingo@redhat.com, juri.lelli@redhat.com, vincent.guittot@linaro.org, valentin.schneider@arm.com, dietmar.eggemann@arm.com, corbet@lwn.net, rdunlap@infradead.org, linux-doc@vger.kernel.org Subject: [PATCH v7 3/3] sched/doc: Update the CPU capacity asymmetry bits Date: Thu, 3 Jun 2021 15:06:27 +0100 Message-Id: <20210603140627.8409-4-beata.michalska@arm.com> In-Reply-To: <20210603140627.8409-1-beata.michalska@arm.com> References: <20210603140627.8409-1-beata.michalska@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Update the documentation bits referring to capacity aware scheduling with regards to newly introduced SD_ASYM_CPUCAPACITY_FULL sched_domain flag. Signed-off-by: Beata Michalska Reviewed-by: Valentin Schneider Reviewed-by: Dietmar Eggemann --- Documentation/scheduler/sched-capacity.rst | 6 ++++-- Documentation/scheduler/sched-energy.rst | 2 +- 2 files changed, 5 insertions(+), 3 deletions(-) diff --git a/Documentation/scheduler/sched-capacity.rst b/Documentation/scheduler/sched-capacity.rst index 9b7cbe43b2d1..805f85f330b5 100644 --- a/Documentation/scheduler/sched-capacity.rst +++ b/Documentation/scheduler/sched-capacity.rst @@ -284,8 +284,10 @@ whether the system exhibits asymmetric CPU capacities. Should that be the case: - The sched_asym_cpucapacity static key will be enabled. -- The SD_ASYM_CPUCAPACITY flag will be set at the lowest sched_domain level that - spans all unique CPU capacity values. +- The SD_ASYM_CPUCAPACITY_FULL flag will be set at the lowest sched_domain + level that spans all unique CPU capacity values. +- The SD_ASYM_CPUCAPACITY flag will be set for any sched_domain that spans + CPUs with any range of asymmetry. The sched_asym_cpucapacity static key is intended to guard sections of code that cater to asymmetric CPU capacity systems. Do note however that said key is diff --git a/Documentation/scheduler/sched-energy.rst b/Documentation/scheduler/sched-energy.rst index afe02d394402..8fbce5e767d9 100644 --- a/Documentation/scheduler/sched-energy.rst +++ b/Documentation/scheduler/sched-energy.rst @@ -328,7 +328,7 @@ section lists these dependencies and provides hints as to how they can be met. As mentioned in the introduction, EAS is only supported on platforms with asymmetric CPU topologies for now. This requirement is checked at run-time by -looking for the presence of the SD_ASYM_CPUCAPACITY flag when the scheduling +looking for the presence of the SD_ASYM_CPUCAPACITY_FULL flag when the scheduling domains are built. See Documentation/scheduler/sched-capacity.rst for requirements to be met for this -- 2.17.1