Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751703AbdFHHzg (ORCPT ); Thu, 8 Jun 2017 03:55:36 -0400 Received: from foss.arm.com ([217.140.101.70]:43188 "EHLO foss.arm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751610AbdFHHze (ORCPT ); Thu, 8 Jun 2017 03:55:34 -0400 From: Dietmar Eggemann To: linux-kernel@vger.kernel.org Cc: linux-pm@vger.kernel.org, linux@arm.linux.org.uk, linux-arm-kernel@lists.infradead.org, Greg Kroah-Hartman , Russell King , Catalin Marinas , Will Deacon , Juri Lelli , Vincent Guittot , Peter Zijlstra , Morten Rasmussen Subject: [PATCH 0/6] arm, arm64: frequency- and cpu-invariant accounting support for task scheduler Date: Thu, 8 Jun 2017 08:55:07 +0100 Message-Id: <20170608075513.12475-1-dietmar.eggemann@arm.com> X-Mailer: git-send-email 2.11.0 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 2550 Lines: 61 For a more accurate (i.e. frequency- and cpu-invariant) load-tracking the task scheduler needs a frequency-scaling and on a heterogeneous system a cpu-scaling correction factor. This patch-set implements a Frequency Invariance Engine (FIE) (topology_get_freq_scale()) in drivers/base/arch_topology.c to provide a frequency-scaling correction factor. The Cpu Invariance Engine (CIE) (topology_get_cpu_scale()) providing a cpu-scaling correction factor was already introduced by the "Fix issues and factorize arm/arm64 capacity information code" patch-set [1]. This patch-set also enables the frequency- and cpu-invariant accounting support. Enabling here means to associate (wire) the task scheduler cname arch_scale_freq_capacity and arch_scale_cpu_capacity with the FIE and CIE function names from drivers/base/arch_topology.c. This replaces the task scheduler's default FIE and CIE in kernel/sched/sched.h. Patch high level description: [ 01/06] Rework cpufreq policy notifier for frequency-invariant accounting support [ 02/06] Frequency Invariance Engine (FIE) [03,04/06] Enable frequency- and cpu-invariant accounting support on arm [05,06/06] Enable frequency- and cpu-invariant accounting support on arm64 The patch-set is based on top of linux-next/master (tag: next-20170607) and it is also available from: git://linux-arm.org/linux-de.git upstream/freq_and_cpu_inv It has been tested on TC2 (arm) and JUNO (arm64) by running a ramp-up rt-app task pinned to a cpu with the ondemand cpufreq governor and checking the load-tracking signals of this task. [1] https://marc.info/?l=linux-kernel&m=149625018223002&w=2 Dietmar Eggemann (6): drivers base/arch_topology: prepare cpufreq policy notifier for frequency-invariant load-tracking support drivers base/arch_topology: frequency-invariant load-tracking support arm: wire frequency-invariant accounting support up to the task scheduler arm: wire cpu-invariant accounting support up to the task scheduler arm64: wire frequency-invariant accounting support up to the task scheduler arm64: wire cpu-invariant accounting support up to the task scheduler arch/arm/include/asm/topology.h | 8 +++++ arch/arm/kernel/topology.c | 1 - arch/arm64/include/asm/topology.h | 8 +++++ arch/arm64/kernel/topology.c | 1 - drivers/base/arch_topology.c | 64 ++++++++++++++++++++++++++++++++++----- include/linux/arch_topology.h | 2 ++ 6 files changed, 75 insertions(+), 9 deletions(-) -- 2.11.0