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Diffstat (limited to 'include/linux/topology.h')
| -rw-r--r-- | include/linux/topology.h | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/include/linux/topology.h b/include/linux/topology.h new file mode 100644 index 00000000000..d70e8972c67 --- /dev/null +++ b/include/linux/topology.h @@ -0,0 +1,136 @@ +/* + * include/linux/topology.h + * + * Written by: Matthew Dobson, IBM Corporation + * + * Copyright (C) 2002, IBM Corp. + * + * All rights reserved. + * + * This program is free software; you can redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; either version 2 of the License, or + * (at your option) any later version. + * + * This program is distributed in the hope that it will be useful, but + * WITHOUT ANY WARRANTY; without even the implied warranty of + * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or + * NON INFRINGEMENT. See the GNU General Public License for more + * details. + * + * You should have received a copy of the GNU General Public License + * along with this program; if not, write to the Free Software + * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA. + * + * Send feedback to <colpatch@us.ibm.com> + */ +#ifndef _LINUX_TOPOLOGY_H +#define _LINUX_TOPOLOGY_H + +#include <linux/cpumask.h> +#include <linux/bitops.h> +#include <linux/mmzone.h> +#include <linux/smp.h> +#include <asm/topology.h> + +#ifndef node_has_online_mem +#define node_has_online_mem(nid) (1) +#endif + +#ifndef nr_cpus_node +#define nr_cpus_node(node) \ + ({ \ + cpumask_t __tmp__; \ + __tmp__ = node_to_cpumask(node); \ + cpus_weight(__tmp__); \ + }) +#endif + +#define for_each_node_with_cpus(node) \ + for_each_online_node(node) \ + if (nr_cpus_node(node)) + +#ifndef node_distance +/* Conform to ACPI 2.0 SLIT distance definitions */ +#define LOCAL_DISTANCE 10 +#define REMOTE_DISTANCE 20 +#define node_distance(from,to) ((from) == (to) ? LOCAL_DISTANCE : REMOTE_DISTANCE) +#endif +#ifndef PENALTY_FOR_NODE_WITH_CPUS +#define PENALTY_FOR_NODE_WITH_CPUS (1) +#endif + +/* + * Below are the 3 major initializers used in building sched_domains: + * SD_SIBLING_INIT, for SMT domains + * SD_CPU_INIT, for SMP domains + * SD_NODE_INIT, for NUMA domains + * + * Any architecture that cares to do any tuning to these values should do so + * by defining their own arch-specific initializer in include/asm/topology.h. + * A definition there will automagically override these default initializers + * and allow arch-specific performance tuning of sched_domains. + */ +#ifdef CONFIG_SCHED_SMT +/* MCD - Do we really need this? It is always on if CONFIG_SCHED_SMT is, + * so can't we drop this in favor of CONFIG_SCHED_SMT? + */ +#define ARCH_HAS_SCHED_WAKE_IDLE +/* Common values for SMT siblings */ +#ifndef SD_SIBLING_INIT +#define SD_SIBLING_INIT (struct sched_domain) { \ + .span = CPU_MASK_NONE, \ + .parent = NULL, \ + .groups = NULL, \ + .min_interval = 1, \ + .max_interval = 2, \ + .busy_factor = 8, \ + .imbalance_pct = 110, \ + .cache_hot_time = 0, \ + .cache_nice_tries = 0, \ + .per_cpu_gain = 25, \ + .flags = SD_LOAD_BALANCE \ + | SD_BALANCE_NEWIDLE \ + | SD_BALANCE_EXEC \ + | SD_WAKE_AFFINE \ + | SD_WAKE_IDLE \ + | SD_SHARE_CPUPOWER, \ + .last_balance = jiffies, \ + .balance_interval = 1, \ + .nr_balance_failed = 0, \ +} +#endif +#endif /* CONFIG_SCHED_SMT */ + +/* Common values for CPUs */ +#ifndef SD_CPU_INIT +#define SD_CPU_INIT (struct sched_domain) { \ + .span = CPU_MASK_NONE, \ + .parent = NULL, \ + .groups = NULL, \ + .min_interval = 1, \ + .max_interval = 4, \ + .busy_factor = 64, \ + .imbalance_pct = 125, \ + .cache_hot_time = (5*1000000/2), \ + .cache_nice_tries = 1, \ + .per_cpu_gain = 100, \ + .flags = SD_LOAD_BALANCE \ + | SD_BALANCE_NEWIDLE \ + | SD_BALANCE_EXEC \ + | SD_WAKE_AFFINE \ + | SD_WAKE_IDLE \ + | SD_WAKE_BALANCE, \ + .last_balance = jiffies, \ + .balance_interval = 1, \ + .nr_balance_failed = 0, \ +} +#endif + +#ifdef CONFIG_NUMA +#ifndef SD_NODE_INIT +#error Please define an appropriate SD_NODE_INIT in include/asm/topology.h!!! +#endif +#endif /* CONFIG_NUMA */ + +#endif /* _LINUX_TOPOLOGY_H */ |