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Diffstat (limited to 'include/linux/topology.h')
| -rw-r--r-- | include/linux/topology.h | 335 |
1 files changed, 335 insertions, 0 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h new file mode 100644 index 00000000..e26db031 --- /dev/null +++ b/include/linux/topology.h @@ -0,0 +1,335 @@ +/* + * 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 */ |