include/linux/topology.h - kernel/mindspeed - Git at Google

 /*
  * include/linux/topology.h
  *
  * Written by: Matthew Dobson, IBM Corporation
  *
  * Copyright (C) 2002, IBM Corp.
  *
  * All rights reserved.
  *
  * This program is free software; you can redistribute it and/or modify
  * it under the terms of the GNU General Public License as published by
  * the Free Software Foundation; either version 2 of the License, or
  * (at your option) any later version.
  *
  * This program is distributed in the hope that it will be useful, but
  * WITHOUT ANY WARRANTY; without even the implied warranty of
  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
  * NON INFRINGEMENT.  See the GNU General Public License for more
  * details.
  *
  * You should have received a copy of the GNU General Public License
  * along with this program; if not, write to the Free Software
  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  *
  * Send feedback to <colpatch@us.ibm.com>
  */
 #ifndef _LINUX_TOPOLOGY_H
 #define _LINUX_TOPOLOGY_H

 #include <linux/cpumask.h>
 #include <linux/bitops.h>
 #include <linux/mmzone.h>
 #include <linux/smp.h>
 #include <linux/percpu.h>
 #include <asm/topology.h>

 #ifndef node_has_online_mem
 #define node_has_online_mem(nid) (1)
 #endif

 #ifndef nr_cpus_node
 #define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
 #endif

 #define for_each_node_with_cpus(node)			\
 	for_each_online_node(node)			\
 		if (nr_cpus_node(node))

 int arch_update_cpu_topology(void);

 /* Conform to ACPI 2.0 SLIT distance definitions */
 #define LOCAL_DISTANCE		10
 #define REMOTE_DISTANCE		20
 #ifndef node_distance
 #define node_distance(from,to)	((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
 #endif
 #ifndef RECLAIM_DISTANCE
 /*
  * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
  * (in whatever arch specific measurement units returned by node_distance())
  * then switch on zone reclaim on boot.
  */
 #define RECLAIM_DISTANCE 30
 #endif
 #ifndef PENALTY_FOR_NODE_WITH_CPUS
 #define PENALTY_FOR_NODE_WITH_CPUS	(1)
 #endif

 /*
  * Below are the 3 major initializers used in building sched_domains:
  * SD_SIBLING_INIT, for SMT domains
  * SD_CPU_INIT, for SMP domains
  * SD_NODE_INIT, for NUMA domains
  *
  * Any architecture that cares to do any tuning to these values should do so
  * by defining their own arch-specific initializer in include/asm/topology.h.
  * A definition there will automagically override these default initializers
  * and allow arch-specific performance tuning of sched_domains.
  * (Only non-zero and non-null fields need be specified.)
  */

 #ifdef CONFIG_SCHED_SMT
 /* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
  * so can't we drop this in favor of CONFIG_SCHED_SMT?
  */
 #define ARCH_HAS_SCHED_WAKE_IDLE
 /* Common values for SMT siblings */
 #ifndef SD_SIBLING_INIT
 #define SD_SIBLING_INIT (struct sched_domain) {				\
 	.min_interval		= 1,					\
 	.max_interval		= 2,					\
 	.busy_factor		= 64,					\
 	.imbalance_pct		= 110,					\
 									\
 	.flags			= 1*SD_LOAD_BALANCE			\
 				| 1*SD_BALANCE_NEWIDLE			\
 				| 1*SD_BALANCE_EXEC			\
 				| 1*SD_BALANCE_FORK			\
 				| 0*SD_BALANCE_WAKE			\
 				| 1*SD_WAKE_AFFINE			\
 				| 1*SD_SHARE_CPUPOWER			\
 				| 0*SD_POWERSAVINGS_BALANCE		\
 				| 1*SD_SHARE_PKG_RESOURCES		\
 				| 0*SD_SERIALIZE			\
 				| 0*SD_PREFER_SIBLING			\
 				| arch_sd_sibling_asym_packing()	\
 				,					\
 	.last_balance		= jiffies,				\
 	.balance_interval	= 1,					\
 	.smt_gain		= 1178,	/* 15% */			\
 }
 #endif
 #endif /* CONFIG_SCHED_SMT */

 #ifdef CONFIG_SCHED_MC
 /* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
 #ifndef SD_MC_INIT
 #define SD_MC_INIT (struct sched_domain) {				\
 	.min_interval		= 1,					\
 	.max_interval		= 4,					\
 	.busy_factor		= 64,					\
 	.imbalance_pct		= 125,					\
 	.cache_nice_tries	= 1,					\
 	.busy_idx		= 2,					\
 	.wake_idx		= 0,					\
 	.forkexec_idx		= 0,					\
 									\
 	.flags			= 1*SD_LOAD_BALANCE			\
 				| 1*SD_BALANCE_NEWIDLE			\
 				| 1*SD_BALANCE_EXEC			\
 				| 1*SD_BALANCE_FORK			\
 				| 0*SD_BALANCE_WAKE			\
 				| 1*SD_WAKE_AFFINE			\
 				| 0*SD_PREFER_LOCAL			\
 				| 0*SD_SHARE_CPUPOWER			\
 				| 1*SD_SHARE_PKG_RESOURCES		\
 				| 0*SD_SERIALIZE			\
 				| sd_balance_for_mc_power()		\
 				| sd_power_saving_flags()		\
 				,					\
 	.last_balance		= jiffies,				\
 	.balance_interval	= 1,					\
 }
 #endif
 #endif /* CONFIG_SCHED_MC */

 /* Common values for CPUs */
 #ifndef SD_CPU_INIT
 #define SD_CPU_INIT (struct sched_domain) {				\
 	.min_interval		= 1,					\
 	.max_interval		= 4,					\
 	.busy_factor		= 64,					\
 	.imbalance_pct		= 125,					\
 	.cache_nice_tries	= 1,					\
 	.busy_idx		= 2,					\
 	.idle_idx		= 1,					\
 	.newidle_idx		= 0,					\
 	.wake_idx		= 0,					\
 	.forkexec_idx		= 0,					\
 									\
 	.flags			= 1*SD_LOAD_BALANCE			\
 				| 1*SD_BALANCE_NEWIDLE			\
 				| 1*SD_BALANCE_EXEC			\
 				| 1*SD_BALANCE_FORK			\
 				| 0*SD_BALANCE_WAKE			\
 				| 1*SD_WAKE_AFFINE			\
 				| 0*SD_PREFER_LOCAL			\
 				| 0*SD_SHARE_CPUPOWER			\
 				| 0*SD_SHARE_PKG_RESOURCES		\
 				| 0*SD_SERIALIZE			\
 				| sd_balance_for_package_power()	\
 				| sd_power_saving_flags()		\
 				,					\
 	.last_balance		= jiffies,				\
 	.balance_interval	= 1,					\
 }
 #endif

 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
 #define SD_ALLNODES_INIT (struct sched_domain) {			\
 	.min_interval		= 64,					\
 	.max_interval		= 64*num_online_cpus(),			\
 	.busy_factor		= 128,					\
 	.imbalance_pct		= 133,					\
 	.cache_nice_tries	= 1,					\
 	.busy_idx		= 3,					\
 	.idle_idx		= 3,					\
 	.flags			= 1*SD_LOAD_BALANCE			\
 				| 1*SD_BALANCE_NEWIDLE			\
 				| 0*SD_BALANCE_EXEC			\
 				| 0*SD_BALANCE_FORK			\
 				| 0*SD_BALANCE_WAKE			\
 				| 0*SD_WAKE_AFFINE			\
 				| 0*SD_SHARE_CPUPOWER			\
 				| 0*SD_POWERSAVINGS_BALANCE		\
 				| 0*SD_SHARE_PKG_RESOURCES		\
 				| 1*SD_SERIALIZE			\
 				| 0*SD_PREFER_SIBLING			\
 				,					\
 	.last_balance		= jiffies,				\
 	.balance_interval	= 64,					\
 }

 #ifndef SD_NODES_PER_DOMAIN
 #define SD_NODES_PER_DOMAIN 16
 #endif

 #ifdef CONFIG_SCHED_BOOK
 #ifndef SD_BOOK_INIT
 #error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
 #endif
 #endif /* CONFIG_SCHED_BOOK */

 #ifdef CONFIG_NUMA
 #ifndef SD_NODE_INIT
 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 #endif

 #endif /* CONFIG_NUMA */

 #ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
 DECLARE_PER_CPU(int, numa_node);

 #ifndef numa_node_id
 /* Returns the number of the current Node. */
 static inline int numa_node_id(void)
 {
 	return __this_cpu_read(numa_node);
 }
 #endif

 #ifndef cpu_to_node
 static inline int cpu_to_node(int cpu)
 {
 	return per_cpu(numa_node, cpu);
 }
 #endif

 #ifndef set_numa_node
 static inline void set_numa_node(int node)
 {
 	percpu_write(numa_node, node);
 }
 #endif

 #ifndef set_cpu_numa_node
 static inline void set_cpu_numa_node(int cpu, int node)
 {
 	per_cpu(numa_node, cpu) = node;
 }
 #endif

 #else	/* !CONFIG_USE_PERCPU_NUMA_NODE_ID */

 /* Returns the number of the current Node. */
 #ifndef numa_node_id
 static inline int numa_node_id(void)
 {
 	return cpu_to_node(raw_smp_processor_id());
 }
 #endif

 #endif	/* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */

 #ifdef CONFIG_HAVE_MEMORYLESS_NODES

 /*
  * N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
  * It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
  * Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
  */
 DECLARE_PER_CPU(int, _numa_mem_);

 #ifndef set_numa_mem
 static inline void set_numa_mem(int node)
 {
 	percpu_write(_numa_mem_, node);
 }
 #endif

 #ifndef numa_mem_id
 /* Returns the number of the nearest Node with memory */
 static inline int numa_mem_id(void)
 {
 	return __this_cpu_read(_numa_mem_);
 }
 #endif

 #ifndef cpu_to_mem
 static inline int cpu_to_mem(int cpu)
 {
 	return per_cpu(_numa_mem_, cpu);
 }
 #endif

 #ifndef set_cpu_numa_mem
 static inline void set_cpu_numa_mem(int cpu, int node)
 {
 	per_cpu(_numa_mem_, cpu) = node;
 }
 #endif

 #else	/* !CONFIG_HAVE_MEMORYLESS_NODES */

 #ifndef numa_mem_id
 /* Returns the number of the nearest Node with memory */
 static inline int numa_mem_id(void)
 {
 	return numa_node_id();
 }
 #endif

 #ifndef cpu_to_mem
 static inline int cpu_to_mem(int cpu)
 {
 	return cpu_to_node(cpu);
 }
 #endif

 #endif	/* [!]CONFIG_HAVE_MEMORYLESS_NODES */

 #ifndef topology_physical_package_id
 #define topology_physical_package_id(cpu)	((void)(cpu), -1)
 #endif
 #ifndef topology_core_id
 #define topology_core_id(cpu)			((void)(cpu), 0)
 #endif
 #ifndef topology_thread_cpumask
 #define topology_thread_cpumask(cpu)		cpumask_of(cpu)
 #endif
 #ifndef topology_core_cpumask
 #define topology_core_cpumask(cpu)		cpumask_of(cpu)
 #endif

 #endif /* _LINUX_TOPOLOGY_H */
	/*
	* include/linux/topology.h
	*
	* Written by: Matthew Dobson, IBM Corporation
	*
	* Copyright (C) 2002, IBM Corp.
	*
	* All rights reserved.
	*
	* This program is free software; you can redistribute it and/or modify
	* it under the terms of the GNU General Public License as published by
	* the Free Software Foundation; either version 2 of the License, or
	* (at your option) any later version.
	*
	* This program is distributed in the hope that it will be useful, but
	* WITHOUT ANY WARRANTY; without even the implied warranty of
	* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
	* NON INFRINGEMENT. See the GNU General Public License for more
	* details.
	*
	* You should have received a copy of the GNU General Public License
	* along with this program; if not, write to the Free Software
	* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
	*
	* Send feedback to <colpatch@us.ibm.com>
	*/
	#ifndef _LINUX_TOPOLOGY_H
	#define _LINUX_TOPOLOGY_H

	#include <linux/cpumask.h>
	#include <linux/bitops.h>
	#include <linux/mmzone.h>
	#include <linux/smp.h>
	#include <linux/percpu.h>
	#include <asm/topology.h>

	#ifndef node_has_online_mem
	#define node_has_online_mem(nid) (1)
	#endif

	#ifndef nr_cpus_node
	#define nr_cpus_node(node) cpumask_weight(cpumask_of_node(node))
	#endif

	#define for_each_node_with_cpus(node) \
	for_each_online_node(node) \
	if (nr_cpus_node(node))

	int arch_update_cpu_topology(void);

	/* Conform to ACPI 2.0 SLIT distance definitions */
	#define LOCAL_DISTANCE 10
	#define REMOTE_DISTANCE 20
	#ifndef node_distance
	#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
	#endif
	#ifndef RECLAIM_DISTANCE
	/*
	* If the distance between nodes in a system is larger than RECLAIM_DISTANCE
	* (in whatever arch specific measurement units returned by node_distance())
	* then switch on zone reclaim on boot.
	*/
	#define RECLAIM_DISTANCE 30
	#endif
	#ifndef PENALTY_FOR_NODE_WITH_CPUS
	#define PENALTY_FOR_NODE_WITH_CPUS (1)
	#endif

	/*
	* Below are the 3 major initializers used in building sched_domains:
	* SD_SIBLING_INIT, for SMT domains
	* SD_CPU_INIT, for SMP domains
	* SD_NODE_INIT, for NUMA domains
	*
	* Any architecture that cares to do any tuning to these values should do so
	* by defining their own arch-specific initializer in include/asm/topology.h.
	* A definition there will automagically override these default initializers
	* and allow arch-specific performance tuning of sched_domains.
	* (Only non-zero and non-null fields need be specified.)
	*/

	#ifdef CONFIG_SCHED_SMT
	/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
	* so can't we drop this in favor of CONFIG_SCHED_SMT?
	*/
	#define ARCH_HAS_SCHED_WAKE_IDLE
	/* Common values for SMT siblings */
	#ifndef SD_SIBLING_INIT
	#define SD_SIBLING_INIT (struct sched_domain) { \
	.min_interval = 1, \
	.max_interval = 2, \
	.busy_factor = 64, \
	.imbalance_pct = 110, \
	\
	.flags = 1*SD_LOAD_BALANCE \
	\| 1*SD_BALANCE_NEWIDLE \
	\| 1*SD_BALANCE_EXEC \
	\| 1*SD_BALANCE_FORK \
	\| 0*SD_BALANCE_WAKE \
	\| 1*SD_WAKE_AFFINE \
	\| 1*SD_SHARE_CPUPOWER \
	\| 0*SD_POWERSAVINGS_BALANCE \
	\| 1*SD_SHARE_PKG_RESOURCES \
	\| 0*SD_SERIALIZE \
	\| 0*SD_PREFER_SIBLING \
	\| arch_sd_sibling_asym_packing() \
	, \
	.last_balance = jiffies, \
	.balance_interval = 1, \
	.smt_gain = 1178, /* 15% */ \
	}
	#endif
	#endif /* CONFIG_SCHED_SMT */

	#ifdef CONFIG_SCHED_MC
	/* Common values for MC siblings. for now mostly derived from SD_CPU_INIT */
	#ifndef SD_MC_INIT
	#define SD_MC_INIT (struct sched_domain) { \
	.min_interval = 1, \
	.max_interval = 4, \
	.busy_factor = 64, \
	.imbalance_pct = 125, \
	.cache_nice_tries = 1, \
	.busy_idx = 2, \
	.wake_idx = 0, \
	.forkexec_idx = 0, \
	\
	.flags = 1*SD_LOAD_BALANCE \
	\| 1*SD_BALANCE_NEWIDLE \
	\| 1*SD_BALANCE_EXEC \
	\| 1*SD_BALANCE_FORK \
	\| 0*SD_BALANCE_WAKE \
	\| 1*SD_WAKE_AFFINE \
	\| 0*SD_PREFER_LOCAL \
	\| 0*SD_SHARE_CPUPOWER \
	\| 1*SD_SHARE_PKG_RESOURCES \
	\| 0*SD_SERIALIZE \
	\| sd_balance_for_mc_power() \
	\| sd_power_saving_flags() \
	, \
	.last_balance = jiffies, \
	.balance_interval = 1, \
	}
	#endif
	#endif /* CONFIG_SCHED_MC */

	/* Common values for CPUs */
	#ifndef SD_CPU_INIT
	#define SD_CPU_INIT (struct sched_domain) { \
	.min_interval = 1, \
	.max_interval = 4, \
	.busy_factor = 64, \
	.imbalance_pct = 125, \
	.cache_nice_tries = 1, \
	.busy_idx = 2, \
	.idle_idx = 1, \
	.newidle_idx = 0, \
	.wake_idx = 0, \
	.forkexec_idx = 0, \
	\
	.flags = 1*SD_LOAD_BALANCE \
	\| 1*SD_BALANCE_NEWIDLE \
	\| 1*SD_BALANCE_EXEC \
	\| 1*SD_BALANCE_FORK \
	\| 0*SD_BALANCE_WAKE \
	\| 1*SD_WAKE_AFFINE \
	\| 0*SD_PREFER_LOCAL \
	\| 0*SD_SHARE_CPUPOWER \
	\| 0*SD_SHARE_PKG_RESOURCES \
	\| 0*SD_SERIALIZE \
	\| sd_balance_for_package_power() \
	\| sd_power_saving_flags() \
	, \
	.last_balance = jiffies, \
	.balance_interval = 1, \
	}
	#endif

	/* sched_domains SD_ALLNODES_INIT for NUMA machines */
	#define SD_ALLNODES_INIT (struct sched_domain) { \
	.min_interval = 64, \
	.max_interval = 64*num_online_cpus(), \
	.busy_factor = 128, \
	.imbalance_pct = 133, \
	.cache_nice_tries = 1, \
	.busy_idx = 3, \
	.idle_idx = 3, \
	.flags = 1*SD_LOAD_BALANCE \
	\| 1*SD_BALANCE_NEWIDLE \
	\| 0*SD_BALANCE_EXEC \
	\| 0*SD_BALANCE_FORK \
	\| 0*SD_BALANCE_WAKE \
	\| 0*SD_WAKE_AFFINE \
	\| 0*SD_SHARE_CPUPOWER \
	\| 0*SD_POWERSAVINGS_BALANCE \
	\| 0*SD_SHARE_PKG_RESOURCES \
	\| 1*SD_SERIALIZE \
	\| 0*SD_PREFER_SIBLING \
	, \
	.last_balance = jiffies, \
	.balance_interval = 64, \
	}

	#ifndef SD_NODES_PER_DOMAIN
	#define SD_NODES_PER_DOMAIN 16
	#endif

	#ifdef CONFIG_SCHED_BOOK
	#ifndef SD_BOOK_INIT
	#error Please define an appropriate SD_BOOK_INIT in include/asm/topology.h!!!
	#endif
	#endif /* CONFIG_SCHED_BOOK */

	#ifdef CONFIG_NUMA
	#ifndef SD_NODE_INIT
	#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
	#endif

	#endif /* CONFIG_NUMA */

	#ifdef CONFIG_USE_PERCPU_NUMA_NODE_ID
	DECLARE_PER_CPU(int, numa_node);

	#ifndef numa_node_id
	/* Returns the number of the current Node. */
	static inline int numa_node_id(void)
	{
	return __this_cpu_read(numa_node);
	}
	#endif

	#ifndef cpu_to_node
	static inline int cpu_to_node(int cpu)
	{
	return per_cpu(numa_node, cpu);
	}
	#endif

	#ifndef set_numa_node
	static inline void set_numa_node(int node)
	{
	percpu_write(numa_node, node);
	}
	#endif

	#ifndef set_cpu_numa_node
	static inline void set_cpu_numa_node(int cpu, int node)
	{
	per_cpu(numa_node, cpu) = node;
	}
	#endif

	#else /* !CONFIG_USE_PERCPU_NUMA_NODE_ID */

	/* Returns the number of the current Node. */
	#ifndef numa_node_id
	static inline int numa_node_id(void)
	{
	return cpu_to_node(raw_smp_processor_id());
	}
	#endif

	#endif /* [!]CONFIG_USE_PERCPU_NUMA_NODE_ID */

	#ifdef CONFIG_HAVE_MEMORYLESS_NODES

	/*
	* N.B., Do NOT reference the '_numa_mem_' per cpu variable directly.
	* It will not be defined when CONFIG_HAVE_MEMORYLESS_NODES is not defined.
	* Use the accessor functions set_numa_mem(), numa_mem_id() and cpu_to_mem().
	*/
	DECLARE_PER_CPU(int, _numa_mem_);

	#ifndef set_numa_mem
	static inline void set_numa_mem(int node)
	{
	percpu_write(_numa_mem_, node);
	}
	#endif

	#ifndef numa_mem_id
	/* Returns the number of the nearest Node with memory */
	static inline int numa_mem_id(void)
	{
	return __this_cpu_read(_numa_mem_);
	}
	#endif

	#ifndef cpu_to_mem
	static inline int cpu_to_mem(int cpu)
	{
	return per_cpu(_numa_mem_, cpu);
	}
	#endif

	#ifndef set_cpu_numa_mem
	static inline void set_cpu_numa_mem(int cpu, int node)
	{
	per_cpu(_numa_mem_, cpu) = node;
	}
	#endif

	#else /* !CONFIG_HAVE_MEMORYLESS_NODES */

	#ifndef numa_mem_id
	/* Returns the number of the nearest Node with memory */
	static inline int numa_mem_id(void)
	{
	return numa_node_id();
	}
	#endif

	#ifndef cpu_to_mem
	static inline int cpu_to_mem(int cpu)
	{
	return cpu_to_node(cpu);
	}
	#endif

	#endif /* [!]CONFIG_HAVE_MEMORYLESS_NODES */

	#ifndef topology_physical_package_id
	#define topology_physical_package_id(cpu) ((void)(cpu), -1)
	#endif
	#ifndef topology_core_id
	#define topology_core_id(cpu) ((void)(cpu), 0)
	#endif
	#ifndef topology_thread_cpumask
	#define topology_thread_cpumask(cpu) cpumask_of(cpu)
	#endif
	#ifndef topology_core_cpumask
	#define topology_core_cpumask(cpu) cpumask_of(cpu)
	#endif

	#endif /* _LINUX_TOPOLOGY_H */