383 lines
9.0 KiB
C
383 lines
9.0 KiB
C
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/*
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* arch/ia64/kernel/domain.c
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* Architecture specific sched-domains builder.
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*
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* Copyright (C) 2004 Jesse Barnes
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* Copyright (C) 2004 Silicon Graphics, Inc.
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*/
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#include <linux/sched.h>
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#include <linux/percpu.h>
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#include <linux/slab.h>
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#include <linux/cpumask.h>
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#include <linux/init.h>
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#include <linux/topology.h>
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#include <linux/nodemask.h>
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#define SD_NODES_PER_DOMAIN 6
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#ifdef CONFIG_NUMA
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/**
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* find_next_best_node - find the next node to include in a sched_domain
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* @node: node whose sched_domain we're building
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* @used_nodes: nodes already in the sched_domain
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*
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* Find the next node to include in a given scheduling domain. Simply
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* finds the closest node not already in the @used_nodes map.
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*
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* Should use nodemask_t.
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*/
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static int __devinit find_next_best_node(int node, unsigned long *used_nodes)
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{
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int i, n, val, min_val, best_node = 0;
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min_val = INT_MAX;
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for (i = 0; i < MAX_NUMNODES; i++) {
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/* Start at @node */
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n = (node + i) % MAX_NUMNODES;
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if (!nr_cpus_node(n))
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continue;
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/* Skip already used nodes */
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if (test_bit(n, used_nodes))
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continue;
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/* Simple min distance search */
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val = node_distance(node, n);
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if (val < min_val) {
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min_val = val;
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best_node = n;
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}
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}
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set_bit(best_node, used_nodes);
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return best_node;
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}
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/**
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* sched_domain_node_span - get a cpumask for a node's sched_domain
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* @node: node whose cpumask we're constructing
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* @size: number of nodes to include in this span
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*
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* Given a node, construct a good cpumask for its sched_domain to span. It
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* should be one that prevents unnecessary balancing, but also spreads tasks
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* out optimally.
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*/
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static cpumask_t __devinit sched_domain_node_span(int node)
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{
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int i;
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cpumask_t span, nodemask;
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DECLARE_BITMAP(used_nodes, MAX_NUMNODES);
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cpus_clear(span);
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bitmap_zero(used_nodes, MAX_NUMNODES);
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nodemask = node_to_cpumask(node);
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cpus_or(span, span, nodemask);
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set_bit(node, used_nodes);
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for (i = 1; i < SD_NODES_PER_DOMAIN; i++) {
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int next_node = find_next_best_node(node, used_nodes);
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nodemask = node_to_cpumask(next_node);
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cpus_or(span, span, nodemask);
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}
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return span;
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}
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#endif
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/*
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* At the moment, CONFIG_SCHED_SMT is never defined, but leave it in so we
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* can switch it on easily if needed.
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*/
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#ifdef CONFIG_SCHED_SMT
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static DEFINE_PER_CPU(struct sched_domain, cpu_domains);
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static struct sched_group sched_group_cpus[NR_CPUS];
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static int __devinit cpu_to_cpu_group(int cpu)
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{
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return cpu;
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}
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#endif
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static DEFINE_PER_CPU(struct sched_domain, phys_domains);
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static struct sched_group sched_group_phys[NR_CPUS];
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static int __devinit cpu_to_phys_group(int cpu)
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{
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#ifdef CONFIG_SCHED_SMT
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return first_cpu(cpu_sibling_map[cpu]);
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#else
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return cpu;
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#endif
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}
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#ifdef CONFIG_NUMA
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/*
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* The init_sched_build_groups can't handle what we want to do with node
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* groups, so roll our own. Now each node has its own list of groups which
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* gets dynamically allocated.
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*/
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static DEFINE_PER_CPU(struct sched_domain, node_domains);
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static struct sched_group *sched_group_nodes[MAX_NUMNODES];
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static DEFINE_PER_CPU(struct sched_domain, allnodes_domains);
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static struct sched_group sched_group_allnodes[MAX_NUMNODES];
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static int __devinit cpu_to_allnodes_group(int cpu)
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{
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return cpu_to_node(cpu);
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}
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#endif
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/*
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* Set up scheduler domains and groups. Callers must hold the hotplug lock.
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*/
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void __devinit arch_init_sched_domains(void)
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{
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int i;
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cpumask_t cpu_default_map;
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/*
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* Setup mask for cpus without special case scheduling requirements.
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* For now this just excludes isolated cpus, but could be used to
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* exclude other special cases in the future.
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*/
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cpus_complement(cpu_default_map, cpu_isolated_map);
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cpus_and(cpu_default_map, cpu_default_map, cpu_online_map);
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/*
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* Set up domains. Isolated domains just stay on the dummy domain.
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*/
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for_each_cpu_mask(i, cpu_default_map) {
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int group;
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struct sched_domain *sd = NULL, *p;
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cpumask_t nodemask = node_to_cpumask(cpu_to_node(i));
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cpus_and(nodemask, nodemask, cpu_default_map);
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#ifdef CONFIG_NUMA
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if (num_online_cpus()
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> SD_NODES_PER_DOMAIN*cpus_weight(nodemask)) {
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sd = &per_cpu(allnodes_domains, i);
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*sd = SD_ALLNODES_INIT;
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sd->span = cpu_default_map;
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group = cpu_to_allnodes_group(i);
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sd->groups = &sched_group_allnodes[group];
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p = sd;
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} else
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p = NULL;
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sd = &per_cpu(node_domains, i);
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*sd = SD_NODE_INIT;
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sd->span = sched_domain_node_span(cpu_to_node(i));
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sd->parent = p;
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cpus_and(sd->span, sd->span, cpu_default_map);
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#endif
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p = sd;
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sd = &per_cpu(phys_domains, i);
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group = cpu_to_phys_group(i);
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*sd = SD_CPU_INIT;
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sd->span = nodemask;
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sd->parent = p;
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sd->groups = &sched_group_phys[group];
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#ifdef CONFIG_SCHED_SMT
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p = sd;
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sd = &per_cpu(cpu_domains, i);
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group = cpu_to_cpu_group(i);
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*sd = SD_SIBLING_INIT;
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sd->span = cpu_sibling_map[i];
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cpus_and(sd->span, sd->span, cpu_default_map);
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sd->parent = p;
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sd->groups = &sched_group_cpus[group];
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#endif
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}
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#ifdef CONFIG_SCHED_SMT
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/* Set up CPU (sibling) groups */
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for_each_cpu_mask(i, cpu_default_map) {
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cpumask_t this_sibling_map = cpu_sibling_map[i];
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cpus_and(this_sibling_map, this_sibling_map, cpu_default_map);
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if (i != first_cpu(this_sibling_map))
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continue;
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init_sched_build_groups(sched_group_cpus, this_sibling_map,
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&cpu_to_cpu_group);
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}
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#endif
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/* Set up physical groups */
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for (i = 0; i < MAX_NUMNODES; i++) {
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cpumask_t nodemask = node_to_cpumask(i);
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cpus_and(nodemask, nodemask, cpu_default_map);
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if (cpus_empty(nodemask))
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continue;
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init_sched_build_groups(sched_group_phys, nodemask,
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&cpu_to_phys_group);
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}
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#ifdef CONFIG_NUMA
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init_sched_build_groups(sched_group_allnodes, cpu_default_map,
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&cpu_to_allnodes_group);
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for (i = 0; i < MAX_NUMNODES; i++) {
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/* Set up node groups */
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struct sched_group *sg, *prev;
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cpumask_t nodemask = node_to_cpumask(i);
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cpumask_t domainspan;
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cpumask_t covered = CPU_MASK_NONE;
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int j;
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cpus_and(nodemask, nodemask, cpu_default_map);
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if (cpus_empty(nodemask))
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continue;
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domainspan = sched_domain_node_span(i);
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cpus_and(domainspan, domainspan, cpu_default_map);
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sg = kmalloc(sizeof(struct sched_group), GFP_KERNEL);
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sched_group_nodes[i] = sg;
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for_each_cpu_mask(j, nodemask) {
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struct sched_domain *sd;
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sd = &per_cpu(node_domains, j);
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sd->groups = sg;
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if (sd->groups == NULL) {
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/* Turn off balancing if we have no groups */
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sd->flags = 0;
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}
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}
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if (!sg) {
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printk(KERN_WARNING
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"Can not alloc domain group for node %d\n", i);
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continue;
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}
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sg->cpu_power = 0;
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sg->cpumask = nodemask;
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cpus_or(covered, covered, nodemask);
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prev = sg;
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for (j = 0; j < MAX_NUMNODES; j++) {
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cpumask_t tmp, notcovered;
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int n = (i + j) % MAX_NUMNODES;
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cpus_complement(notcovered, covered);
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cpus_and(tmp, notcovered, cpu_default_map);
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cpus_and(tmp, tmp, domainspan);
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if (cpus_empty(tmp))
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break;
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nodemask = node_to_cpumask(n);
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cpus_and(tmp, tmp, nodemask);
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if (cpus_empty(tmp))
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continue;
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sg = kmalloc(sizeof(struct sched_group), GFP_KERNEL);
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if (!sg) {
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printk(KERN_WARNING
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"Can not alloc domain group for node %d\n", j);
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break;
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}
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sg->cpu_power = 0;
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sg->cpumask = tmp;
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cpus_or(covered, covered, tmp);
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prev->next = sg;
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prev = sg;
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}
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prev->next = sched_group_nodes[i];
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}
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#endif
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/* Calculate CPU power for physical packages and nodes */
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for_each_cpu_mask(i, cpu_default_map) {
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int power;
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struct sched_domain *sd;
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#ifdef CONFIG_SCHED_SMT
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sd = &per_cpu(cpu_domains, i);
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power = SCHED_LOAD_SCALE;
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sd->groups->cpu_power = power;
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#endif
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sd = &per_cpu(phys_domains, i);
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power = SCHED_LOAD_SCALE + SCHED_LOAD_SCALE *
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(cpus_weight(sd->groups->cpumask)-1) / 10;
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sd->groups->cpu_power = power;
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#ifdef CONFIG_NUMA
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sd = &per_cpu(allnodes_domains, i);
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if (sd->groups) {
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power = SCHED_LOAD_SCALE + SCHED_LOAD_SCALE *
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(cpus_weight(sd->groups->cpumask)-1) / 10;
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sd->groups->cpu_power = power;
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}
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#endif
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}
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#ifdef CONFIG_NUMA
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for (i = 0; i < MAX_NUMNODES; i++) {
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struct sched_group *sg = sched_group_nodes[i];
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int j;
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if (sg == NULL)
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continue;
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next_sg:
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for_each_cpu_mask(j, sg->cpumask) {
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struct sched_domain *sd;
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int power;
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sd = &per_cpu(phys_domains, j);
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if (j != first_cpu(sd->groups->cpumask)) {
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/*
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* Only add "power" once for each
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* physical package.
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*/
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continue;
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}
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power = SCHED_LOAD_SCALE + SCHED_LOAD_SCALE *
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(cpus_weight(sd->groups->cpumask)-1) / 10;
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sg->cpu_power += power;
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}
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sg = sg->next;
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if (sg != sched_group_nodes[i])
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goto next_sg;
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}
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#endif
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/* Attach the domains */
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for_each_online_cpu(i) {
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struct sched_domain *sd;
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#ifdef CONFIG_SCHED_SMT
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sd = &per_cpu(cpu_domains, i);
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#else
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sd = &per_cpu(phys_domains, i);
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#endif
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cpu_attach_domain(sd, i);
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}
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}
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void __devinit arch_destroy_sched_domains(void)
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{
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#ifdef CONFIG_NUMA
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int i;
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for (i = 0; i < MAX_NUMNODES; i++) {
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struct sched_group *oldsg, *sg = sched_group_nodes[i];
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if (sg == NULL)
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continue;
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sg = sg->next;
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next_sg:
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oldsg = sg;
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sg = sg->next;
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kfree(oldsg);
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if (oldsg != sched_group_nodes[i])
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goto next_sg;
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sched_group_nodes[i] = NULL;
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}
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#endif
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}
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