topology.h
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上传日期:2009-04-28
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- /*
- * 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,
- .busy_idx = 0,
- .idle_idx = 0,
- .newidle_idx = 1,
- .wake_idx = 0,
- .forkexec_idx = 0,
- .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,
- .busy_idx = 2,
- .idle_idx = 1,
- .newidle_idx = 2,
- .wake_idx = 1,
- .forkexec_idx = 1,
- .flags = SD_LOAD_BALANCE
- | SD_BALANCE_NEWIDLE
- | SD_BALANCE_EXEC
- | SD_WAKE_AFFINE,
- .last_balance = jiffies,
- .balance_interval = 1,
- .nr_balance_failed = 0,
- }
- #endif
- /* sched_domains SD_ALLNODES_INIT for NUMA machines */
- #define SD_ALLNODES_INIT (struct sched_domain) {
- .span = CPU_MASK_NONE,
- .parent = NULL,
- .groups = NULL,
- .min_interval = 64,
- .max_interval = 64*num_online_cpus(),
- .busy_factor = 128,
- .imbalance_pct = 133,
- .cache_hot_time = (10*1000000),
- .cache_nice_tries = 1,
- .busy_idx = 3,
- .idle_idx = 3,
- .newidle_idx = 0, /* unused */
- .wake_idx = 0, /* unused */
- .forkexec_idx = 0, /* unused */
- .per_cpu_gain = 100,
- .flags = SD_LOAD_BALANCE,
- .last_balance = jiffies,
- .balance_interval = 64,
- .nr_balance_failed = 0,
- }
- #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 */