From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from sasl.smtp.pobox.com (a-sasl-quonix.sasl.smtp.pobox.com [208.72.237.25]) by ozlabs.org (Postfix) with ESMTP id B7BACDDF65 for ; Thu, 19 Jun 2008 10:30:36 +1000 (EST) From: Nathan Lynch To: linux-kernel@vger.kernel.org Subject: [RFC/PATCH 1/3] sched: support arch override of sched_group cpu power Date: Wed, 18 Jun 2008 19:29:32 -0500 Message-Id: <1213835374-10868-2-git-send-email-ntl@pobox.com> In-Reply-To: <1213835374-10868-1-git-send-email-ntl@pobox.com> References: <1213835374-10868-1-git-send-email-ntl@pobox.com> Cc: linuxppc-dev@ozlabs.org, Ingo Molnar , Paul Mackerras , Anton Blanchard List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Add a new sched domain flag, SD_ASYM_CPU_POWER, which signifies that the architecture may override the cpu power for a cpu via a hook in init_sched_groups_power(). Add a dummy definition of arch_cpu_power() which conforms with the existing behavior. Signed-off-by: Nathan Lynch --- include/linux/sched.h | 1 + kernel/sched.c | 14 ++++++++++++++ 2 files changed, 15 insertions(+), 0 deletions(-) diff --git a/include/linux/sched.h b/include/linux/sched.h index c5d3f84..cfbefca 100644 --- a/include/linux/sched.h +++ b/include/linux/sched.h @@ -713,6 +713,7 @@ enum cpu_idle_type { #define SD_SHARE_PKG_RESOURCES 512 /* Domain members share cpu pkg resources */ #define SD_SERIALIZE 1024 /* Only a single load balancing instance */ #define SD_WAKE_IDLE_FAR 2048 /* Gain latency sacrificing cache hit */ +#define SD_ASYM_CPU_POWER 4096 /* Domain members of unequal power */ #define BALANCE_FOR_MC_POWER \ (sched_smt_power_savings ? SD_POWERSAVINGS_BALANCE : 0) diff --git a/kernel/sched.c b/kernel/sched.c index eaf6751..3fba083 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -6761,6 +6761,13 @@ static void free_sched_groups(const cpumask_t *cpu_map, cpumask_t *nodemask) } #endif +#ifndef arch_cpu_power +static inline unsigned int arch_cpu_power(int cpu, unsigned int default_power) +{ + return default_power; +} +#endif + /* * Initialize sched groups cpu_power. * @@ -6789,6 +6796,13 @@ static void init_sched_groups_power(int cpu, struct sched_domain *sd) sd->groups->__cpu_power = 0; + if (!child && (sd->flags & SD_ASYM_CPU_POWER)) { + unsigned int power = arch_cpu_power(cpu, SCHED_LOAD_SCALE); + + sg_inc_cpu_power(sd->groups, power); + return; + } + /* * For perf policy, if the groups in child domain share resources * (for example cores sharing some portions of the cache hierarchy -- 1.5.5