From patchwork Fri May 30 06:36:00 2014 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Yuyang Du X-Patchwork-Id: 4271371 Return-Path: X-Original-To: patchwork-linux-pm@patchwork.kernel.org Delivered-To: patchwork-parsemail@patchwork2.web.kernel.org Received: from mail.kernel.org (mail.kernel.org [198.145.19.201]) by patchwork2.web.kernel.org (Postfix) with ESMTP id F08E3BEEA7 for ; Fri, 30 May 2014 14:44:45 +0000 (UTC) Received: from mail.kernel.org (localhost [127.0.0.1]) by mail.kernel.org (Postfix) with ESMTP id 392E620395 for ; Fri, 30 May 2014 14:44:45 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 4C63120384 for ; Fri, 30 May 2014 14:44:44 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S964798AbaE3OlE (ORCPT ); Fri, 30 May 2014 10:41:04 -0400 Received: from mga02.intel.com ([134.134.136.20]:55008 "EHLO mga02.intel.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S964795AbaE3OlB (ORCPT ); Fri, 30 May 2014 10:41:01 -0400 Received: from orsmga002.jf.intel.com ([10.7.209.21]) by orsmga101.jf.intel.com with ESMTP; 30 May 2014 07:41:00 -0700 X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="4.98,941,1392192000"; d="scan'208";a="548946866" Received: from dalvikqa005-desktop.bj.intel.com ([10.238.151.105]) by orsmga002.jf.intel.com with ESMTP; 30 May 2014 07:40:55 -0700 From: Yuyang Du To: mingo@redhat.com, peterz@infradead.org, rafael.j.wysocki@intel.com, linux-kernel@vger.kernel.org, linux-pm@vger.kernel.org Cc: arjan.van.de.ven@intel.com, len.brown@intel.com, alan.cox@intel.com, mark.gross@intel.com, pjt@google.com, bsegall@google.com, morten.rasmussen@arm.com, vincent.guittot@linaro.org, rajeev.d.muralidhar@intel.com, vishwesh.m.rudramuni@intel.com, nicole.chalhoub@intel.com, ajaya.durg@intel.com, harinarayanan.seshadri@intel.com, jacob.jun.pan@linux.intel.com, fengguang.wu@intel.com, yuyang.du@intel.com Subject: [RFC PATCH 04/16 v3] CPU CC update period is changeable via sysctl Date: Fri, 30 May 2014 14:36:00 +0800 Message-Id: <1401431772-14320-5-git-send-email-yuyang.du@intel.com> X-Mailer: git-send-email 1.7.9.5 In-Reply-To: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> References: <1401431772-14320-1-git-send-email-yuyang.du@intel.com> Sender: linux-pm-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-pm@vger.kernel.org X-Spam-Status: No, score=-6.0 required=5.0 tests=BAYES_00, DATE_IN_PAST_06_12, RCVD_IN_DNSWL_HI, RP_MATCHES_RCVD, UNPARSEABLE_RELAY autolearn=unavailable version=3.3.1 X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on mail.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP sysctl_sched_cc_sum_period is the CC update period. Make it changable via sysctl tool. In general, the longer this period, the stabler and slower to respond to task concurrency change on this CPU. Signed-off-by: Yuyang Du --- include/linux/sched/sysctl.h | 4 ++++ kernel/sysctl.c | 9 +++++++++ 2 files changed, 13 insertions(+) diff --git a/include/linux/sched/sysctl.h b/include/linux/sched/sysctl.h index 8045a55..f8a3e0a 100644 --- a/include/linux/sched/sysctl.h +++ b/include/linux/sched/sysctl.h @@ -36,6 +36,10 @@ extern unsigned int sysctl_sched_min_granularity; extern unsigned int sysctl_sched_wakeup_granularity; extern unsigned int sysctl_sched_child_runs_first; +#ifdef CONFIG_SMP +extern unsigned int sysctl_sched_cc_sum_period; +#endif + enum sched_tunable_scaling { SCHED_TUNABLESCALING_NONE, SCHED_TUNABLESCALING_LOG, diff --git a/kernel/sysctl.c b/kernel/sysctl.c index 74f5b58..13aea95 100644 --- a/kernel/sysctl.c +++ b/kernel/sysctl.c @@ -1090,6 +1090,15 @@ static struct ctl_table kern_table[] = { .proc_handler = proc_dointvec, }, #endif +#ifdef CONFIG_SMP + { + .procname = "sched_cc_sum_period", + .data = &sysctl_sched_cc_sum_period, + .maxlen = sizeof(sysctl_sched_cc_sum_period), + .mode = 0644, + .proc_handler = proc_dointvec, + }, +#endif { } };