Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1756563AbZDZUrU (ORCPT ); Sun, 26 Apr 2009 16:47:20 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1755099AbZDZUqt (ORCPT ); Sun, 26 Apr 2009 16:46:49 -0400 Received: from e28smtp04.in.ibm.com ([59.145.155.4]:34936 "EHLO e28smtp04.in.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756198AbZDZUqr (ORCPT ); Sun, 26 Apr 2009 16:46:47 -0400 From: Vaidyanathan Srinivasan Subject: [RFC PATCH v1 2/3] sched: threshold helper functions To: Linux Kernel , Suresh B Siddha , Venkatesh Pallipadi , Peter Zijlstra , Arjan van de Ven Cc: Ingo Molnar , Dipankar Sarma , Balbir Singh , Vatsa , Gautham R Shenoy , Andi Kleen , Gregory Haskins , Mike Galbraith , Thomas Gleixner , Arun Bharadwaj , Vaidyanathan Srinivasan Date: Mon, 27 Apr 2009 02:16:57 +0530 Message-ID: <20090426204657.17495.21835.stgit@drishya.in.ibm.com> In-Reply-To: <20090426204029.17495.46609.stgit@drishya.in.ibm.com> References: <20090426204029.17495.46609.stgit@drishya.in.ibm.com> User-Agent: StGIT/0.14.2 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1855 Lines: 60 Define group capacity threshold as a multiple of impalance percentage at higher levels of sched_mc settings. sched_mc=3 Group capacity increased by 25% (5 tasks on quad core) sched_mc=4 Group capacity increased by 50% (6 tasks on quad core) sched_mc=5 Group capacity increased by 100% (8 tasks on quad core) *** RFC patch for discussion *** Signed-off-by: Vaidyanathan Srinivasan --- kernel/sched.c | 21 +++++++++++++++++++++ 1 files changed, 21 insertions(+), 0 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index b902e58..f88ed04 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3291,6 +3291,21 @@ static inline int get_sd_load_idx(struct sched_domain *sd, #if defined(CONFIG_SCHED_MC) || defined(CONFIG_SCHED_SMT) + +static inline unsigned int group_capacity_bump_pct(struct sched_domain *sd) +{ + if (sched_mc_power_savings >= POWERSAVINGS_INCREASE_GROUP_CAPACITY_3) + return 100+(sd->imbalance_pct-100)*4; + + if (sched_mc_power_savings >= POWERSAVINGS_INCREASE_GROUP_CAPACITY_2) + return 100+(sd->imbalance_pct-100)*2; + + if (sched_mc_power_savings >= POWERSAVINGS_INCREASE_GROUP_CAPACITY_1) + return sd->imbalance_pct; + + return 100; +} + /** * init_sd_power_savings_stats - Initialize power savings statistics for * the given sched_domain, during load balancing. @@ -3433,6 +3448,12 @@ static inline int check_power_save_busiest_group(struct sd_lb_stats *sds, { return 0; } + +static inline unsigned int group_capacity_bump_pct(struct sched_domain *sd) +{ + return 100; +} + #endif /* CONFIG_SCHED_MC || CONFIG_SCHED_SMT */ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/