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 A2ECFC433B4 for ; Mon, 10 May 2021 16:31:42 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 801A7601FD for ; Mon, 10 May 2021 16:31:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231654AbhEJQcq (ORCPT ); Mon, 10 May 2021 12:32:46 -0400 Received: from foss.arm.com ([217.140.110.172]:33994 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S231585AbhEJQc3 (ORCPT ); Mon, 10 May 2021 12:32:29 -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 854A11691; Mon, 10 May 2021 09:31:23 -0700 (PDT) Received: from e113131-lin.cambridge.arm.com (e113131-lin.cambridge.arm.com [10.1.195.76]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 2FB533F73B; Mon, 10 May 2021 09:31:22 -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 v3 1/3] sched/core: Introduce SD_ASYM_CPUCAPACITY_FULL sched_domain flag Date: Mon, 10 May 2021 17:30:56 +0100 Message-Id: <1620664258-11045-2-git-send-email-beata.michalska@arm.com> In-Reply-To: <1620664258-11045-1-git-send-email-beata.michalska@arm.com> References: <1620664258-11045-1-git-send-email-beata.michalska@arm.com> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Introducing new, complementary to SD_ASYM_CPUCAPACITY, sched_domain topology flag, to distinguish between shed_domains where any CPU capacity asymmetry is detected (SD_ASYM_CPUCAPACITY) and ones where a full range of CPU capacities is visible to all domain members (SD_ASYM_CPUCAPACITY_FULL). With the distinction between full and partial CPU capacity asymmetry, brought in by the newly introduced flag, the scope of the original SD_ASYM_CPUCAPACITY flag gets shifted, still maintaining the existing behaviour when one is detected on a given sched domain, allowing misfit migrations within sched domains that do not observe full range of CPU capacities but still do have members with different capacity values. It loses though it's meaning when it comes to the lowest CPU asymmetry sched_domain level per-cpu pointer, which is to be now denoted by SD_ASYM_CPUCAPACITY_FULL flag. Signed-off-by: Beata Michalska Tested-by: Valentin Schneider Reviewed-by: Valentin Schneider --- include/linux/sched/sd_flags.h | 10 ++++++++++ 1 file changed, 10 insertions(+) diff --git a/include/linux/sched/sd_flags.h b/include/linux/sched/sd_flags.h index 34b21e9..57bde66 100644 --- a/include/linux/sched/sd_flags.h +++ b/include/linux/sched/sd_flags.h @@ -91,6 +91,16 @@ SD_FLAG(SD_WAKE_AFFINE, SDF_SHARED_CHILD) SD_FLAG(SD_ASYM_CPUCAPACITY, SDF_SHARED_PARENT | SDF_NEEDS_GROUPS) /* + * Domain members have different CPU capacities spanning all unique CPU + * capacity values. + * + * SHARED_PARENT: Set from the topmost domain down to the first domain where + * all available CPU capacities are visible + * NEEDS_GROUPS: Per-CPU capacity is asymmetric between groups. + */ +SD_FLAG(SD_ASYM_CPUCAPACITY_FULL, SDF_SHARED_PARENT | SDF_NEEDS_GROUPS) + +/* * Domain members share CPU capacity (i.e. SMT) * * SHARED_CHILD: Set from the base domain up until spanned CPUs no longer share -- 2.7.4