| /* |
| * 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/arch_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 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 |
| #define DISTANCE_BITS 8 |
| #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()) |
| * and node_reclaim_mode is enabled then the VM will only call node_reclaim() |
| * on nodes within this distance. |
| */ |
| #define RECLAIM_DISTANCE 30 |
| #endif |
| |
| /* |
| * The following tunable allows platforms to override the default node |
| * reclaim distance (RECLAIM_DISTANCE) if remote memory accesses are |
| * sufficiently fast that the default value actually hurts |
| * performance. |
| * |
| * AMD EPYC machines use this because even though the 2-hop distance |
| * is 32 (3.2x slower than a local memory access) performance actually |
| * *improves* if allowed to reclaim memory and load balance tasks |
| * between NUMA nodes 2-hops apart. |
| */ |
| extern int __read_mostly node_reclaim_distance; |
| |
| #ifndef PENALTY_FOR_NODE_WITH_CPUS |
| #define PENALTY_FOR_NODE_WITH_CPUS (1) |
| #endif |
| |
| #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 raw_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) |
| { |
| this_cpu_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) |
| { |
| this_cpu_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 raw_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_die_id |
| #define topology_die_id(cpu) ((void)(cpu), -1) |
| #endif |
| #ifndef topology_core_id |
| #define topology_core_id(cpu) ((void)(cpu), 0) |
| #endif |
| #ifndef topology_sibling_cpumask |
| #define topology_sibling_cpumask(cpu) cpumask_of(cpu) |
| #endif |
| #ifndef topology_core_cpumask |
| #define topology_core_cpumask(cpu) cpumask_of(cpu) |
| #endif |
| #ifndef topology_die_cpumask |
| #define topology_die_cpumask(cpu) cpumask_of(cpu) |
| #endif |
| |
| #if defined(CONFIG_SCHED_SMT) && !defined(cpu_smt_mask) |
| static inline const struct cpumask *cpu_smt_mask(int cpu) |
| { |
| return topology_sibling_cpumask(cpu); |
| } |
| #endif |
| |
| static inline const struct cpumask *cpu_cpu_mask(int cpu) |
| { |
| return cpumask_of_node(cpu_to_node(cpu)); |
| } |
| |
| |
| #endif /* _LINUX_TOPOLOGY_H */ |