From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754497AbYIXQPY (ORCPT ); Wed, 24 Sep 2008 12:15:24 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753796AbYIXQOp (ORCPT ); Wed, 24 Sep 2008 12:14:45 -0400 Received: from e28smtp06.in.ibm.com ([59.145.155.6]:38198 "EHLO e28esmtp06.in.ibm.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753704AbYIXQOn (ORCPT ); Wed, 24 Sep 2008 12:14:43 -0400 From: Vaidyanathan Srinivasan Subject: [RFC PATCH v1 2/5] Calculate statistics for current load balance domain To: Linux Kernel , Suresh B Siddha , Venkatesh Pallipadi , Peter Zijlstra Cc: Ingo Molnar , Dipankar Sarma , Balbir Singh , Vatsa , Gautham R Shenoy , Andi Kleen , David Collier-Brown , Tim Connors , Max Krasnyansky , Vaidyanathan Srinivasan Date: Wed, 24 Sep 2008 21:47:39 +0530 Message-ID: <20080924161739.31581.70726.stgit@drishya.in.ibm.com> In-Reply-To: <20080924161228.31581.57651.stgit@drishya.in.ibm.com> References: <20080924161228.31581.57651.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 Add data structures and function to collect per sched domain statistics required for load balance decision. Signed-off-by: Vaidyanathan Srinivasan --- kernel/sched.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 files changed, 41 insertions(+), 0 deletions(-) diff --git a/kernel/sched.c b/kernel/sched.c index abf60ea..8c394a4 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -3178,6 +3178,47 @@ int get_group_loads(struct sched_group *group, int this_cpu, return need_balance; } +/* Struct to hold sched domain level loads */ + +struct sd_loads { + struct sched_domain *sd; + unsigned long load; + unsigned long cpu_power; + unsigned long max_load; + unsigned long avg_load; + struct group_loads local; + struct group_loads busiest; + /* sched_mc balance groups */ + struct group_loads min_load_group; + struct group_loads power_save_leader_group; +}; + +/* Function to aggregate per group loads to sched domain loads */ + +void update_sd_loads(struct sd_loads *sdl, struct group_loads *gl) +{ + int group_capacity = gl->group->__cpu_power / SCHED_LOAD_SCALE; + + if (gl->local_group) + sdl->local = *gl; + else { + sdl->load += gl->load; + sdl->cpu_power += gl->group->__cpu_power; + + + /* Find the busiest */ + if (gl->load > sdl->load && + (gl->nr_running > group_capacity || + gl->group_imbalance)) { + + sdl->load = gl->load; + sdl->busiest = *gl; + } + } + + +} + /* * find_busiest_group finds and returns the busiest CPU group within the * domain. It calculates and returns the amount of weighted load which