Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
tjh.dev
kernel
os
linux
1/*
2 * include/linux/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 _LINUX_TOPOLOGY_H
28#define _LINUX_TOPOLOGY_H
29
30#include <linux/cpumask.h>
31#include <linux/bitops.h>
32#include <linux/mmzone.h>
33#include <linux/smp.h>
34#include <asm/topology.h>
35
36#ifndef node_has_online_mem
37#define node_has_online_mem(nid) (1)
38#endif
39
40#ifndef nr_cpus_node
41#define nr_cpus_node(node) \
42 ({ \
43 cpumask_t __tmp__; \
44 __tmp__ = node_to_cpumask(node); \
45 cpus_weight(__tmp__); \
46 })
47#endif
48
49#define for_each_node_with_cpus(node) \
50 for_each_online_node(node) \
51 if (nr_cpus_node(node))
52
53#ifndef node_distance
54/* Conform to ACPI 2.0 SLIT distance definitions */
55#define LOCAL_DISTANCE 10
56#define REMOTE_DISTANCE 20
57#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE)
58#endif
59#ifndef PENALTY_FOR_NODE_WITH_CPUS
60#define PENALTY_FOR_NODE_WITH_CPUS (1)
61#endif
62
63/*
64 * Below are the 3 major initializers used in building sched_domains:
65 * SD_SIBLING_INIT, for SMT domains
66 * SD_CPU_INIT, for SMP domains
67 * SD_NODE_INIT, for NUMA domains
68 *
69 * Any architecture that cares to do any tuning to these values should do so
70 * by defining their own arch-specific initializer in include/asm/topology.h.
71 * A definition there will automagically override these default initializers
72 * and allow arch-specific performance tuning of sched_domains.
73 */
74#ifdef CONFIG_SCHED_SMT
75/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is,
76 * so can't we drop this in favor of CONFIG_SCHED_SMT?
77 */
78#define ARCH_HAS_SCHED_WAKE_IDLE
79/* Common values for SMT siblings */
80#ifndef SD_SIBLING_INIT
81#define SD_SIBLING_INIT (struct sched_domain) { \
82 .span = CPU_MASK_NONE, \
83 .parent = NULL, \
84 .groups = NULL, \
85 .min_interval = 1, \
86 .max_interval = 2, \
87 .busy_factor = 8, \
88 .imbalance_pct = 110, \
89 .cache_hot_time = 0, \
90 .cache_nice_tries = 0, \
91 .per_cpu_gain = 25, \
92 .busy_idx = 0, \
93 .idle_idx = 0, \
94 .newidle_idx = 1, \
95 .wake_idx = 0, \
96 .forkexec_idx = 0, \
97 .flags = SD_LOAD_BALANCE \
98 | SD_BALANCE_NEWIDLE \
99 | SD_BALANCE_EXEC \
100 | SD_WAKE_AFFINE \
101 | SD_WAKE_IDLE \
102 | SD_SHARE_CPUPOWER, \
103 .last_balance = jiffies, \
104 .balance_interval = 1, \
105 .nr_balance_failed = 0, \
106}
107#endif
108#endif /* CONFIG_SCHED_SMT */
109
110/* Common values for CPUs */
111#ifndef SD_CPU_INIT
112#define SD_CPU_INIT (struct sched_domain) { \
113 .span = CPU_MASK_NONE, \
114 .parent = NULL, \
115 .groups = NULL, \
116 .min_interval = 1, \
117 .max_interval = 4, \
118 .busy_factor = 64, \
119 .imbalance_pct = 125, \
120 .cache_hot_time = (5*1000000/2), \
121 .cache_nice_tries = 1, \
122 .per_cpu_gain = 100, \
123 .busy_idx = 2, \
124 .idle_idx = 1, \
125 .newidle_idx = 2, \
126 .wake_idx = 1, \
127 .forkexec_idx = 1, \
128 .flags = SD_LOAD_BALANCE \
129 | SD_BALANCE_NEWIDLE \
130 | SD_BALANCE_EXEC \
131 | SD_WAKE_AFFINE, \
132 .last_balance = jiffies, \
133 .balance_interval = 1, \
134 .nr_balance_failed = 0, \
135}
136#endif
137
138#ifdef CONFIG_NUMA
139#ifndef SD_NODE_INIT
140#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
141#endif
142#endif /* CONFIG_NUMA */
143
144#endif /* _LINUX_TOPOLOGY_H */