include/linux/topology.h

   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 RECLAIM_DISTANCE
  60 /*
  61  * If the distance between nodes in a system is larger than RECLAIM_DISTANCE
  62  * (in whatever arch specific measurement units returned by node_distance())
  63  * then switch on zone reclaim on boot.
  64  */
  65 #define RECLAIM_DISTANCE 20
  66 #endif
  67 #ifndef PENALTY_FOR_NODE_WITH_CPUS
  68 #define PENALTY_FOR_NODE_WITH_CPUS      (1)
  69 #endif
  70
  71 /*
  72  * Below are the 3 major initializers used in building sched_domains:
  73  * SD_SIBLING_INIT, for SMT domains
  74  * SD_CPU_INIT, for SMP domains
  75  * SD_NODE_INIT, for NUMA domains
  76  *
  77  * Any architecture that cares to do any tuning to these values should do so
  78  * by defining their own arch-specific initializer in include/asm/topology.h.
  79  * A definition there will automagically override these default initializers
  80  * and allow arch-specific performance tuning of sched_domains.
  81  */
  82 #ifdef CONFIG_SCHED_SMT
  83 /* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
  84  * so can't we drop this in favor of CONFIG_SCHED_SMT?
  85  */
  86 #define ARCH_HAS_SCHED_WAKE_IDLE
  87 /* Common values for SMT siblings */
  88 #ifndef SD_SIBLING_INIT
  89 #define SD_SIBLING_INIT (struct sched_domain) {         \
  90         .span                   = CPU_MASK_NONE,        \
  91         .parent                 = NULL,                 \
  92         .groups                 = NULL,                 \
  93         .min_interval           = 1,                    \
  94         .max_interval           = 2,                    \
  95         .busy_factor            = 8,                    \
  96         .imbalance_pct          = 110,                  \
  97         .cache_nice_tries       = 0,                    \
  98         .per_cpu_gain           = 25,                   \
  99         .busy_idx               = 0,                    \
 100         .idle_idx               = 0,                    \
 101         .newidle_idx            = 1,                    \
 102         .wake_idx               = 0,                    \
 103         .forkexec_idx           = 0,                    \
 104         .flags                  = SD_LOAD_BALANCE       \
 105                                 | SD_BALANCE_NEWIDLE    \
 106                                 | SD_BALANCE_EXEC       \
 107                                 | SD_WAKE_AFFINE        \
 108                                 | SD_WAKE_IDLE          \
 109                                 | SD_SHARE_CPUPOWER,    \
 110         .last_balance           = jiffies,              \
 111         .balance_interval       = 1,                    \
 112         .nr_balance_failed      = 0,                    \
 113 }
 114 #endif
 115 #endif /* CONFIG_SCHED_SMT */
 116
 117 /* Common values for CPUs */
 118 #ifndef SD_CPU_INIT
 119 #define SD_CPU_INIT (struct sched_domain) {             \
 120         .span                   = CPU_MASK_NONE,        \
 121         .parent                 = NULL,                 \
 122         .groups                 = NULL,                 \
 123         .min_interval           = 1,                    \
 124         .max_interval           = 4,                    \
 125         .busy_factor            = 64,                   \
 126         .imbalance_pct          = 125,                  \
 127         .cache_nice_tries       = 1,                    \
 128         .per_cpu_gain           = 100,                  \
 129         .busy_idx               = 2,                    \
 130         .idle_idx               = 1,                    \
 131         .newidle_idx            = 2,                    \
 132         .wake_idx               = 1,                    \
 133         .forkexec_idx           = 1,                    \
 134         .flags                  = SD_LOAD_BALANCE       \
 135                                 | SD_BALANCE_NEWIDLE    \
 136                                 | SD_BALANCE_EXEC       \
 137                                 | SD_WAKE_AFFINE,       \
 138         .last_balance           = jiffies,              \
 139         .balance_interval       = 1,                    \
 140         .nr_balance_failed      = 0,                    \
 141 }
 142 #endif
 143
 144 /* sched_domains SD_ALLNODES_INIT for NUMA machines */
 145 #define SD_ALLNODES_INIT (struct sched_domain) {        \
 146         .span                   = CPU_MASK_NONE,        \
 147         .parent                 = NULL,                 \
 148         .groups                 = NULL,                 \
 149         .min_interval           = 64,                   \
 150         .max_interval           = 64*num_online_cpus(), \
 151         .busy_factor            = 128,                  \
 152         .imbalance_pct          = 133,                  \
 153         .cache_hot_time         = (10*1000000),         \
 154         .cache_nice_tries       = 1,                    \
 155         .busy_idx               = 3,                    \
 156         .idle_idx               = 3,                    \
 157         .newidle_idx            = 0, /* unused */       \
 158         .wake_idx               = 0, /* unused */       \
 159         .forkexec_idx           = 0, /* unused */       \
 160         .per_cpu_gain           = 100,                  \
 161         .flags                  = SD_LOAD_BALANCE,      \
 162         .last_balance           = jiffies,              \
 163         .balance_interval       = 64,                   \
 164         .nr_balance_failed      = 0,                    \
 165 }
 166
 167 #ifdef CONFIG_NUMA
 168 #ifndef SD_NODE_INIT
 169 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 170 #endif
 171 #endif /* CONFIG_NUMA */
 172
 173 #endif /* _LINUX_TOPOLOGY_H */