From patchwork Mon May 23 10:58:47 2016 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Morten Rasmussen X-Patchwork-Id: 68357 Delivered-To: patch@linaro.org Received: by 10.140.92.199 with SMTP id b65csp13370qge; Mon, 23 May 2016 03:58:50 -0700 (PDT) X-Received: by 10.66.218.161 with SMTP id ph1mr14988879pac.127.1464001127657; Mon, 23 May 2016 03:58:47 -0700 (PDT) Return-Path: Received: from vger.kernel.org (vger.kernel.org. [209.132.180.67]) by mx.google.com with ESMTP id d15si51081055pfb.137.2016.05.23.03.58.47; Mon, 23 May 2016 03:58:47 -0700 (PDT) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754365AbcEWK6e (ORCPT + 30 others); Mon, 23 May 2016 06:58:34 -0400 Received: from foss.arm.com ([217.140.101.70]:50140 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1754317AbcEWK6d (ORCPT ); Mon, 23 May 2016 06:58:33 -0400 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.72.51.249]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id A11DA447; Mon, 23 May 2016 03:58:54 -0700 (PDT) Received: from e105550-lin.cambridge.arm.com (e105550-lin.cambridge.arm.com [10.1.207.130]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPA id 577A53F246; Mon, 23 May 2016 03:58:31 -0700 (PDT) From: Morten Rasmussen To: peterz@infradead.org, mingo@redhat.com Cc: dietmar.eggemann@arm.com, yuyang.du@intel.com, vincent.guittot@linaro.org, mgalbraith@suse.de, linux-kernel@vger.kernel.org, Morten Rasmussen Subject: [PATCH 05/16] sched: Introduce SD_ASYM_CPUCAPACITY sched_domain topology flag Date: Mon, 23 May 2016 11:58:47 +0100 Message-Id: <1464001138-25063-6-git-send-email-morten.rasmussen@arm.com> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1464001138-25063-1-git-send-email-morten.rasmussen@arm.com> References: <1464001138-25063-1-git-send-email-morten.rasmussen@arm.com> Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Add a topology flag to the sched_domain hierarchy indicating which domains span cpus of different capacity (e.g. big.LITTLE). This information is currently only available through iterating through the capacities of all the cpus. cc: Ingo Molnar cc: Peter Zijlstra Signed-off-by: Morten Rasmussen --- include/linux/sched.h | 1 + kernel/sched/core.c | 6 +++++- 2 files changed, 6 insertions(+), 1 deletion(-) -- 1.9.1 diff --git a/include/linux/sched.h b/include/linux/sched.h index 463b91f..37752db 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -1015,6 +1015,7 @@ extern void wake_up_q(struct wake_q_head *head); #define SD_BALANCE_FORK 0x0008 /* Balance on fork, clone */ #define SD_BALANCE_WAKE 0x0010 /* Balance on wakeup */ #define SD_WAKE_AFFINE 0x0020 /* Wake task to waking CPU */ +#define SD_ASYM_CPUCAPACITY 0x0040 /* Domain contains cpus of different capacity*/ #define SD_SHARE_CPUCAPACITY 0x0080 /* Domain members share cpu capacity */ #define SD_SHARE_POWERDOMAIN 0x0100 /* Domain members share power domain */ #define SD_SHARE_PKG_RESOURCES 0x0200 /* Domain members share cpu pkg resources */ diff --git a/kernel/sched/core.c b/kernel/sched/core.c index 404c078..d9619a3 100644 --- a/kernel/sched/core.c +++ b/kernel/sched/core.c @@ -5659,6 +5659,7 @@ static int sd_degenerate(struct sched_domain *sd) SD_BALANCE_FORK | SD_BALANCE_EXEC | SD_SHARE_CPUCAPACITY | + SD_ASYM_CPUCAPACITY | SD_SHARE_PKG_RESOURCES | SD_SHARE_POWERDOMAIN)) { if (sd->groups != sd->groups->next) @@ -5689,6 +5690,7 @@ sd_parent_degenerate(struct sched_domain *sd, struct sched_domain *parent) SD_BALANCE_NEWIDLE | SD_BALANCE_FORK | SD_BALANCE_EXEC | + SD_ASYM_CPUCAPACITY | SD_SHARE_CPUCAPACITY | SD_SHARE_PKG_RESOURCES | SD_PREFER_SIBLING | @@ -6303,14 +6305,16 @@ static int sched_domains_curr_level; * SD_NUMA - describes NUMA topologies * SD_SHARE_POWERDOMAIN - describes shared power domain * - * Odd one out: + * Odd ones out: * SD_ASYM_PACKING - describes SMT quirks + * SD_ASYM_CPUCAPACITY - describes mixed capacity topologies */ #define TOPOLOGY_SD_FLAGS \ (SD_SHARE_CPUCAPACITY | \ SD_SHARE_PKG_RESOURCES | \ SD_NUMA | \ SD_ASYM_PACKING | \ + SD_ASYM_CPUCAPACITY | \ SD_SHARE_POWERDOMAIN) static struct sched_domain *