c88d591089
The problem with wake_idle() is that is doesn't respect things like
cpu_power, which means it doesn't deal well with SMT nor the recent
RT interaction.
To cure this, it needs to do what sched_balance_self() does, which
leads to the possibility of merging select_task_rq_fair() and
sched_balance_self().
Modify sched_balance_self() to:
- update_shares() when walking up the domain tree,
(it only called it for the top domain, but it should
have done this anyway), which allows us to remove
this ugly bit from try_to_wake_up().
- do wake_affine() on the smallest domain that contains
both this (the waking) and the prev (the wakee) cpu for
WAKE invocations.
Then use the top-down balance steps it had to replace wake_idle().
This leads to the dissapearance of SD_WAKE_BALANCE and
SD_WAKE_IDLE_FAR, with SD_WAKE_IDLE replaced with SD_BALANCE_WAKE.
SD_WAKE_AFFINE needs SD_BALANCE_WAKE to be effective.
Touch all topology bits to replace the old with new SD flags --
platforms might need re-tuning, enabling SD_BALANCE_WAKE
conditionally on a NUMA distance seems like a good additional
feature, magny-core and small nehalem systems would want this
enabled, systems with slow interconnects would not.
Signed-off-by: Peter Zijlstra <a.p.zijlstra@chello.nl>
LKML-Reference: <new-submission>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
232 lines
5.7 KiB
C
232 lines
5.7 KiB
C
/*
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* Written by: Matthew Dobson, IBM Corporation
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*
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* Copyright (C) 2002, IBM Corp.
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*
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* All rights reserved.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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* Send feedback to <colpatch@us.ibm.com>
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*/
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#ifndef _ASM_X86_TOPOLOGY_H
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#define _ASM_X86_TOPOLOGY_H
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#ifdef CONFIG_X86_32
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# ifdef CONFIG_X86_HT
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# define ENABLE_TOPO_DEFINES
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# endif
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#else
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# ifdef CONFIG_SMP
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# define ENABLE_TOPO_DEFINES
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# endif
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#endif
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/* Node not present */
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#define NUMA_NO_NODE (-1)
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#ifdef CONFIG_NUMA
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#include <linux/cpumask.h>
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#include <asm/mpspec.h>
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#ifdef CONFIG_X86_32
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/* Mappings between logical cpu number and node number */
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extern int cpu_to_node_map[];
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/* Returns the number of the node containing CPU 'cpu' */
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static inline int cpu_to_node(int cpu)
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{
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return cpu_to_node_map[cpu];
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}
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#define early_cpu_to_node(cpu) cpu_to_node(cpu)
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#else /* CONFIG_X86_64 */
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/* Mappings between logical cpu number and node number */
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DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map);
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/* Returns the number of the current Node. */
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DECLARE_PER_CPU(int, node_number);
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#define numa_node_id() percpu_read(node_number)
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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extern int cpu_to_node(int cpu);
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extern int early_cpu_to_node(int cpu);
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#else /* !CONFIG_DEBUG_PER_CPU_MAPS */
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/* Returns the number of the node containing CPU 'cpu' */
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static inline int cpu_to_node(int cpu)
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{
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return per_cpu(x86_cpu_to_node_map, cpu);
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}
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/* Same function but used if called before per_cpu areas are setup */
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static inline int early_cpu_to_node(int cpu)
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{
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return early_per_cpu(x86_cpu_to_node_map, cpu);
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}
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#endif /* !CONFIG_DEBUG_PER_CPU_MAPS */
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#endif /* CONFIG_X86_64 */
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/* Mappings between node number and cpus on that node. */
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extern cpumask_var_t node_to_cpumask_map[MAX_NUMNODES];
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#ifdef CONFIG_DEBUG_PER_CPU_MAPS
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extern const struct cpumask *cpumask_of_node(int node);
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#else
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/* Returns a pointer to the cpumask of CPUs on Node 'node'. */
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static inline const struct cpumask *cpumask_of_node(int node)
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{
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return node_to_cpumask_map[node];
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}
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#endif
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extern void setup_node_to_cpumask_map(void);
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/*
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* Returns the number of the node containing Node 'node'. This
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* architecture is flat, so it is a pretty simple function!
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*/
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#define parent_node(node) (node)
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#define pcibus_to_node(bus) __pcibus_to_node(bus)
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#ifdef CONFIG_X86_32
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extern unsigned long node_start_pfn[];
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extern unsigned long node_end_pfn[];
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extern unsigned long node_remap_size[];
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#define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
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# define SD_CACHE_NICE_TRIES 1
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# define SD_IDLE_IDX 1
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# define SD_NEWIDLE_IDX 2
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# define SD_FORKEXEC_IDX 0
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#else
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# define SD_CACHE_NICE_TRIES 2
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# define SD_IDLE_IDX 2
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# define SD_NEWIDLE_IDX 2
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# define SD_FORKEXEC_IDX 1
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#endif
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/* sched_domains SD_NODE_INIT for NUMA machines */
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#define SD_NODE_INIT (struct sched_domain) { \
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.min_interval = 8, \
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.max_interval = 32, \
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.busy_factor = 32, \
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.imbalance_pct = 125, \
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.cache_nice_tries = SD_CACHE_NICE_TRIES, \
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.busy_idx = 3, \
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.idle_idx = SD_IDLE_IDX, \
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.newidle_idx = SD_NEWIDLE_IDX, \
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.wake_idx = 1, \
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.forkexec_idx = SD_FORKEXEC_IDX, \
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\
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.flags = 1*SD_LOAD_BALANCE \
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| 1*SD_BALANCE_NEWIDLE \
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| 1*SD_BALANCE_EXEC \
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| 1*SD_BALANCE_FORK \
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| 1*SD_BALANCE_WAKE \
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| 1*SD_WAKE_AFFINE \
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| 0*SD_SHARE_CPUPOWER \
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| 0*SD_POWERSAVINGS_BALANCE \
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| 0*SD_SHARE_PKG_RESOURCES \
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| 1*SD_SERIALIZE \
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| 0*SD_PREFER_SIBLING \
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, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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}
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#ifdef CONFIG_X86_64_ACPI_NUMA
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extern int __node_distance(int, int);
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#define node_distance(a, b) __node_distance(a, b)
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#endif
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#else /* !CONFIG_NUMA */
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static inline int numa_node_id(void)
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{
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return 0;
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}
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static inline int cpu_to_node(int cpu)
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{
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return 0;
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}
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static inline int early_cpu_to_node(int cpu)
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{
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return 0;
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}
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static inline const struct cpumask *cpumask_of_node(int node)
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{
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return cpu_online_mask;
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}
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static inline void setup_node_to_cpumask_map(void) { }
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#endif
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#include <asm-generic/topology.h>
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extern const struct cpumask *cpu_coregroup_mask(int cpu);
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#ifdef ENABLE_TOPO_DEFINES
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#define topology_physical_package_id(cpu) (cpu_data(cpu).phys_proc_id)
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#define topology_core_id(cpu) (cpu_data(cpu).cpu_core_id)
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#define topology_core_cpumask(cpu) (per_cpu(cpu_core_map, cpu))
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#define topology_thread_cpumask(cpu) (per_cpu(cpu_sibling_map, cpu))
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/* indicates that pointers to the topology cpumask_t maps are valid */
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#define arch_provides_topology_pointers yes
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#endif
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static inline void arch_fix_phys_package_id(int num, u32 slot)
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{
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}
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struct pci_bus;
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void x86_pci_root_bus_res_quirks(struct pci_bus *b);
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#ifdef CONFIG_SMP
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#define mc_capable() ((boot_cpu_data.x86_max_cores > 1) && \
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(cpumask_weight(cpu_core_mask(0)) != nr_cpu_ids))
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#define smt_capable() (smp_num_siblings > 1)
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#endif
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#ifdef CONFIG_NUMA
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extern int get_mp_bus_to_node(int busnum);
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extern void set_mp_bus_to_node(int busnum, int node);
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#else
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static inline int get_mp_bus_to_node(int busnum)
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{
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return 0;
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}
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static inline void set_mp_bus_to_node(int busnum, int node)
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{
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}
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#endif
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#endif /* _ASM_X86_TOPOLOGY_H */
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