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/*
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* linux/include/asm-ia64/topology.h
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*
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* Copyright (C) 2002, Erich Focht, NEC
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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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#ifndef _ASM_IA64_TOPOLOGY_H
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#define _ASM_IA64_TOPOLOGY_H
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#include <asm/acpi.h>
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#include <asm/numa.h>
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#include <asm/smp.h>
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#ifdef CONFIG_NUMA
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/* Nodes w/o CPUs are preferred for memory allocations, see build_zonelists */
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#define PENALTY_FOR_NODE_WITH_CPUS 255
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/*
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* Returns the number of the node containing CPU 'cpu'
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*/
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#define cpu_to_node(cpu) (int)(cpu_to_node_map[cpu])
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/*
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* Returns a bitmask of CPUs on Node 'node'.
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*/
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#define node_to_cpumask(node) (node_to_cpu_mask[node])
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/*
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* Returns the number of the node containing Node 'nid'.
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* Not implemented here. Multi-level hierarchies detected with
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* the help of node_distance().
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*/
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#define parent_node(nid) (nid)
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/*
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* Returns the number of the first CPU on Node 'node'.
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*/
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#define node_to_first_cpu(node) (first_cpu(node_to_cpumask(node)))
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/*
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* Determines the node for a given pci bus
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*/
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#define pcibus_to_node(bus) PCI_CONTROLLER(bus)->node
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void build_cpu_to_node_map(void);
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#define SD_CPU_INIT (struct sched_domain) { \
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.span = CPU_MASK_NONE, \
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.parent = NULL, \
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.groups = NULL, \
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.min_interval = 1, \
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.max_interval = 4, \
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.busy_factor = 64, \
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.imbalance_pct = 125, \
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.per_cpu_gain = 100, \
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.cache_nice_tries = 2, \
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.busy_idx = 2, \
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.idle_idx = 1, \
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.newidle_idx = 2, \
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.wake_idx = 1, \
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.forkexec_idx = 1, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_NEWIDLE \
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| SD_BALANCE_EXEC \
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| SD_WAKE_AFFINE, \
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.last_balance = jiffies, \
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.balance_interval = 1, \
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.nr_balance_failed = 0, \
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}
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/* sched_domains SD_NODE_INIT for IA64 NUMA machines */
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#define SD_NODE_INIT (struct sched_domain) { \
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.span = CPU_MASK_NONE, \
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.parent = NULL, \
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.groups = NULL, \
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.min_interval = 8, \
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.max_interval = 8*(min(num_online_cpus(), 32)), \
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.busy_factor = 64, \
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.imbalance_pct = 125, \
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.cache_nice_tries = 2, \
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.busy_idx = 3, \
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.idle_idx = 2, \
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.newidle_idx = 0, /* unused */ \
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.wake_idx = 1, \
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.forkexec_idx = 1, \
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.per_cpu_gain = 100, \
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.flags = SD_LOAD_BALANCE \
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| SD_BALANCE_EXEC \
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| SD_BALANCE_FORK \
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| SD_WAKE_BALANCE, \
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.last_balance = jiffies, \
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.balance_interval = 64, \
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.nr_balance_failed = 0, \
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}
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#endif /* CONFIG_NUMA */
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[PATCH] Export cpu topology in sysfs
The patch implements cpu topology exportation by sysfs.
Items (attributes) are similar to /proc/cpuinfo.
1) /sys/devices/system/cpu/cpuX/topology/physical_package_id:
represent the physical package id of cpu X;
2) /sys/devices/system/cpu/cpuX/topology/core_id:
represent the cpu core id to cpu X;
3) /sys/devices/system/cpu/cpuX/topology/thread_siblings:
represent the thread siblings to cpu X in the same core;
4) /sys/devices/system/cpu/cpuX/topology/core_siblings:
represent the thread siblings to cpu X in the same physical package;
To implement it in an architecture-neutral way, a new source file,
driver/base/topology.c, is to export the 5 attributes.
If one architecture wants to support this feature, it just needs to
implement 4 defines, typically in file include/asm-XXX/topology.h.
The 4 defines are:
#define topology_physical_package_id(cpu)
#define topology_core_id(cpu)
#define topology_thread_siblings(cpu)
#define topology_core_siblings(cpu)
The type of **_id is int.
The type of siblings is cpumask_t.
To be consistent on all architectures, the 4 attributes should have
deafult values if their values are unavailable. Below is the rule.
1) physical_package_id: If cpu has no physical package id, -1 is the
default value.
2) core_id: If cpu doesn't support multi-core, its core id is 0.
3) thread_siblings: Just include itself, if the cpu doesn't support
HT/multi-thread.
4) core_siblings: Just include itself, if the cpu doesn't support
multi-core and HT/Multi-thread.
So be careful when declaring the 4 defines in include/asm-XXX/topology.h.
If an attribute isn't defined on an architecture, it won't be exported.
Thank Nathan, Greg, Andi, Paul and Venki.
The patch provides defines for i386/x86_64/ia64.
Signed-off-by: Zhang, Yanmin <yanmin.zhang@intel.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Nick Piggin <nickpiggin@yahoo.com.au>
Cc: Greg KH <greg@kroah.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
19 years ago
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#ifdef CONFIG_SMP
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#define topology_physical_package_id(cpu) (cpu_data(cpu)->socket_id)
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#define topology_core_id(cpu) (cpu_data(cpu)->core_id)
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#define topology_core_siblings(cpu) (cpu_core_map[cpu])
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#define topology_thread_siblings(cpu) (cpu_sibling_map[cpu])
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#endif
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#include <asm-generic/topology.h>
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#endif /* _ASM_IA64_TOPOLOGY_H */
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