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
  35 #include <asm/topology.h>
  36
  37 #ifndef nr_cpus_node
  38 #define nr_cpus_node(node)                                                      \
  39         ({                                                                      \
  40                 cpumask_t __tmp__;                                              \
  41                 __tmp__ = node_to_cpumask(node);                                \
  42                 cpus_weight(__tmp__);                                           \
  43         })
  44 #endif
  45
  46 static inline int __next_node_with_cpus(int node)
  47 {
  48         do
  49                 ++node;
  50         while (node < numnodes && !nr_cpus_node(node));
  51         return node;
  52 }
  53
  54 #define for_each_node_with_cpus(node) \
  55         for (node = 0; node < numnodes; node = __next_node_with_cpus(node))
  56
  57 #ifndef node_distance
  58 #define node_distance(from,to)  ((from) != (to))
  59 #endif
  60 #ifndef PENALTY_FOR_NODE_WITH_CPUS
  61 #define PENALTY_FOR_NODE_WITH_CPUS      (1)
  62 #endif
  63
  64 /*
  65  * Below are the 3 major initializers used in building sched_domains:
  66  * SD_SIBLING_INIT, for SMT domains
  67  * SD_CPU_INIT, for SMP domains
  68  * SD_NODE_INIT, for NUMA domains
  69  *
  70  * Any architecture that cares to do any tuning to these values should do so
  71  * by defining their own arch-specific initializer in include/asm/topology.h.
  72  * A definition there will automagically override these default initializers
  73  * and allow arch-specific performance tuning of sched_domains.
  74  */
  75 #ifdef CONFIG_SCHED_SMT
  76 /* MCD - Do we really need this?  It is always on if CONFIG_SCHED_SMT is,
  77  * so can't we drop this in favor of CONFIG_SCHED_SMT?
  78  */
  79 #define ARCH_HAS_SCHED_WAKE_IDLE
  80 /* Common values for SMT siblings */
  81 #ifndef SD_SIBLING_INIT
  82 #define SD_SIBLING_INIT (struct sched_domain) {         \
  83         .span                   = CPU_MASK_NONE,        \
  84         .parent                 = NULL,                 \
  85         .groups                 = NULL,                 \
  86         .min_interval           = 1,                    \
  87         .max_interval           = 2,                    \
  88         .busy_factor            = 8,                    \
  89         .imbalance_pct          = 110,                  \
  90         .cache_hot_time         = 0,                    \
  91         .cache_nice_tries       = 0,                    \
  92         .per_cpu_gain           = 25,                   \
  93         .flags                  = SD_LOAD_BALANCE       \
  94                                 | SD_BALANCE_NEWIDLE    \
  95                                 | SD_BALANCE_EXEC       \
  96                                 | SD_WAKE_AFFINE        \
  97                                 | SD_WAKE_IDLE          \
  98                                 | SD_SHARE_CPUPOWER,    \
  99         .last_balance           = jiffies,              \
 100         .balance_interval       = 1,                    \
 101         .nr_balance_failed      = 0,                    \
 102 }
 103 #endif
 104 #endif /* CONFIG_SCHED_SMT */
 105
 106 /* Common values for CPUs */
 107 #ifndef SD_CPU_INIT
 108 #define SD_CPU_INIT (struct sched_domain) {             \
 109         .span                   = CPU_MASK_NONE,        \
 110         .parent                 = NULL,                 \
 111         .groups                 = NULL,                 \
 112         .min_interval           = 1,                    \
 113         .max_interval           = 4,                    \
 114         .busy_factor            = 64,                   \
 115         .imbalance_pct          = 125,                  \
 116         .cache_hot_time         = (5*1000/2),           \
 117         .cache_nice_tries       = 1,                    \
 118         .per_cpu_gain           = 100,                  \
 119         .flags                  = SD_LOAD_BALANCE       \
 120                                 | SD_BALANCE_NEWIDLE    \
 121                                 | SD_BALANCE_EXEC       \
 122                                 | SD_WAKE_AFFINE        \
 123                                 | SD_WAKE_BALANCE,      \
 124         .last_balance           = jiffies,              \
 125         .balance_interval       = 1,                    \
 126         .nr_balance_failed      = 0,                    \
 127 }
 128 #endif
 129
 130 #ifdef CONFIG_NUMA
 131 #ifndef SD_NODE_INIT
 132 #error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!!
 133 #endif
 134 #endif /* CONFIG_NUMA */
 135
 136 #endif /* _LINUX_TOPOLOGY_H */