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[PATCH] sched: add option to serialize load balancing
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1da177e4
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1/*
2 * linux/include/asm-i386/topology.h
3 *
4 * Written by: Matthew Dobson, IBM Corporation
5 *
6 * Copyright (C) 2002, IBM Corp.
7 *
8 * All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or modify
11 * it under the terms of the GNU General Public License as published by
12 * the Free Software Foundation; either version 2 of the License, or
13 * (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful, but
16 * WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
18 * NON INFRINGEMENT. See the GNU General Public License for more
19 * details.
20 *
21 * You should have received a copy of the GNU General Public License
22 * along with this program; if not, write to the Free Software
23 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
24 *
25 * Send feedback to <colpatch@us.ibm.com>
26 */
27#ifndef _ASM_I386_TOPOLOGY_H
28#define _ASM_I386_TOPOLOGY_H
29
8b09fb34 30#ifdef CONFIG_X86_HT
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31#define topology_physical_package_id(cpu) (cpu_data[cpu].phys_proc_id)
32#define topology_core_id(cpu) (cpu_data[cpu].cpu_core_id)
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33#define topology_core_siblings(cpu) (cpu_core_map[cpu])
34#define topology_thread_siblings(cpu) (cpu_sibling_map[cpu])
35#endif
36
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37#ifdef CONFIG_NUMA
38
39#include <asm/mpspec.h>
40
41#include <linux/cpumask.h>
42
43/* Mappings between logical cpu number and node number */
44extern cpumask_t node_2_cpu_mask[];
45extern int cpu_2_node[];
46
47/* Returns the number of the node containing CPU 'cpu' */
48static inline int cpu_to_node(int cpu)
49{
50 return cpu_2_node[cpu];
51}
52
53/* Returns the number of the node containing Node 'node'. This architecture is flat,
54 so it is a pretty simple function! */
55#define parent_node(node) (node)
56
57/* Returns a bitmask of CPUs on Node 'node'. */
58static inline cpumask_t node_to_cpumask(int node)
59{
60 return node_2_cpu_mask[node];
61}
62
63/* Returns the number of the first CPU on Node 'node'. */
64static inline int node_to_first_cpu(int node)
65{
66 cpumask_t mask = node_to_cpumask(node);
67 return first_cpu(mask);
68}
69
69e1a33f 70#define pcibus_to_node(bus) ((long) (bus)->sysdata)
8c5a0908 71#define pcibus_to_cpumask(bus) node_to_cpumask(pcibus_to_node(bus))
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72
73/* sched_domains SD_NODE_INIT for NUMAQ machines */
74#define SD_NODE_INIT (struct sched_domain) { \
75 .span = CPU_MASK_NONE, \
76 .parent = NULL, \
1a848870 77 .child = NULL, \
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78 .groups = NULL, \
79 .min_interval = 8, \
80 .max_interval = 32, \
81 .busy_factor = 32, \
82 .imbalance_pct = 125, \
1da177e4 83 .cache_nice_tries = 1, \
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84 .busy_idx = 3, \
85 .idle_idx = 1, \
86 .newidle_idx = 2, \
87 .wake_idx = 1, \
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88 .per_cpu_gain = 100, \
89 .flags = SD_LOAD_BALANCE \
90 | SD_BALANCE_EXEC \
687f1661 91 | SD_BALANCE_FORK \
08c183f3 92 | SD_SERIALIZE \
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93 | SD_WAKE_BALANCE, \
94 .last_balance = jiffies, \
95 .balance_interval = 1, \
96 .nr_balance_failed = 0, \
97}
98
99extern unsigned long node_start_pfn[];
100extern unsigned long node_end_pfn[];
101extern unsigned long node_remap_size[];
102
103#define node_has_online_mem(nid) (node_start_pfn[nid] != node_end_pfn[nid])
104
105#else /* !CONFIG_NUMA */
106/*
107 * Other i386 platforms should define their own version of the
108 * above macros here.
109 */
110
111#include <asm-generic/topology.h>
112
113#endif /* CONFIG_NUMA */
114
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115extern cpumask_t cpu_coregroup_map(int cpu);
116
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117#ifdef CONFIG_SMP
118#define mc_capable() (boot_cpu_data.x86_max_cores > 1)
119#define smt_capable() (smp_num_siblings > 1)
120#endif
121
1da177e4 122#endif /* _ASM_I386_TOPOLOGY_H */