From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755478Ab2APQWr (ORCPT ); Mon, 16 Jan 2012 11:22:47 -0500 Received: from e23smtp09.au.ibm.com ([202.81.31.142]:48700 "EHLO e23smtp09.au.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752129Ab2APQWq (ORCPT ); Mon, 16 Jan 2012 11:22:46 -0500 Subject: [RFC PATCH v1 0/2] sched: unified sched_powersavings tunables To: Vincent Guittot , Peter Zijlstra , Indan Zupancic , Youquan Song , Ingo Molnar , Arjan van de Ven , Suresh Siddha From: Vaidyanathan Srinivasan Cc: Linux Kernel Date: Mon, 16 Jan 2012 21:52:26 +0530 Message-ID: <20120116161740.29759.4679.stgit@localhost> User-Agent: StGit/0.15 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit x-cbid: 12011607-3568-0000-0000-000001100D1A Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi, I have created the following RFC patch based on the recent discussions and consensus on simplifying the power aware scheduler in the kernel. Ref: LWN: Rethinking power-aware scheduling http://lwn.net/Articles/474915/ The goal of the unified tunable are as follows: * Simple and single tunable for different (all) topology * Good default powersavings for kernel * Potential to map this setting to other subsystems like cpufreq and cpuidle What this patch does: (first step) * Create a single sched_powersavings tunable in sysfs * Enable current sched_mc and sched_smt features based on value of this single tunable What this patch is yet to do: * Tune the default power savings to pack packages only till a threshold of say 50% * Add notifiers to change setting on battery/AC transitions * Feed the thresholds from arch specific code so that different archs can do 'optimal' packing based on topology * May be move this to /sys/device/system/powersavings and add additional platform tunables like x86_energy_perf_policy? This RFC has only x86 changes and has been tested on dual-socket, quad-core,HT configuration. Please let me know your comments and feedback. Thanks, Vaidy --- Vaidyanathan Srinivasan (2): sched: unified sched_powersavings sysfs tunable sched: fix group_capacity for thread level consolidation arch/x86/Kconfig | 20 ++++-------- arch/x86/kernel/smpboot.c | 2 + block/blk.h | 11 ++++--- drivers/base/cpu.c | 2 + include/linux/sched.h | 29 +++++++++-------- include/linux/topology.h | 9 +---- kernel/sched/core.c | 75 +++++++++++---------------------------------- kernel/sched/fair.c | 38 ++++++++++++++++------- 8 files changed, 77 insertions(+), 109 deletions(-)