diff options
Diffstat (limited to 'arch/ia64/kernel/domain.c')
| -rw-r--r-- | arch/ia64/kernel/domain.c | 396 |
1 files changed, 0 insertions, 396 deletions
diff --git a/arch/ia64/kernel/domain.c b/arch/ia64/kernel/domain.c deleted file mode 100644 index bbb8efe126b..00000000000 --- a/arch/ia64/kernel/domain.c +++ /dev/null @@ -1,396 +0,0 @@ -/* - * arch/ia64/kernel/domain.c - * Architecture specific sched-domains builder. - * - * Copyright (C) 2004 Jesse Barnes - * Copyright (C) 2004 Silicon Graphics, Inc. - */ - -#include <linux/sched.h> -#include <linux/percpu.h> -#include <linux/slab.h> -#include <linux/cpumask.h> -#include <linux/init.h> -#include <linux/topology.h> -#include <linux/nodemask.h> - -#define SD_NODES_PER_DOMAIN 16 - -#ifdef CONFIG_NUMA -/** - * find_next_best_node - find the next node to include in a sched_domain - * @node: node whose sched_domain we're building - * @used_nodes: nodes already in the sched_domain - * - * Find the next node to include in a given scheduling domain. Simply - * finds the closest node not already in the @used_nodes map. - * - * Should use nodemask_t. - */ -static int find_next_best_node(int node, unsigned long *used_nodes) -{ - int i, n, val, min_val, best_node = 0; - - min_val = INT_MAX; - - for (i = 0; i < MAX_NUMNODES; i++) { - /* Start at @node */ - n = (node + i) % MAX_NUMNODES; - - if (!nr_cpus_node(n)) - continue; - - /* Skip already used nodes */ - if (test_bit(n, used_nodes)) - continue; - - /* Simple min distance search */ - val = node_distance(node, n); - - if (val < min_val) { - min_val = val; - best_node = n; - } - } - - set_bit(best_node, used_nodes); - return best_node; -} - -/** - * sched_domain_node_span - get a cpumask for a node's sched_domain - * @node: node whose cpumask we're constructing - * @size: number of nodes to include in this span - * - * Given a node, construct a good cpumask for its sched_domain to span. It - * should be one that prevents unnecessary balancing, but also spreads tasks - * out optimally. - */ -static cpumask_t sched_domain_node_span(int node) -{ - int i; - cpumask_t span, nodemask; - DECLARE_BITMAP(used_nodes, MAX_NUMNODES); - - cpus_clear(span); - bitmap_zero(used_nodes, MAX_NUMNODES); - - nodemask = node_to_cpumask(node); - cpus_or(span, span, nodemask); - set_bit(node, used_nodes); - - for (i = 1; i < SD_NODES_PER_DOMAIN; i++) { - int next_node = find_next_best_node(node, used_nodes); - nodemask = node_to_cpumask(next_node); - cpus_or(span, span, nodemask); - } - - return span; -} -#endif - -/* - * At the moment, CONFIG_SCHED_SMT is never defined, but leave it in so we - * can switch it on easily if needed. - */ -#ifdef CONFIG_SCHED_SMT -static DEFINE_PER_CPU(struct sched_domain, cpu_domains); -static struct sched_group sched_group_cpus[NR_CPUS]; -static int cpu_to_cpu_group(int cpu) -{ - return cpu; -} -#endif - -static DEFINE_PER_CPU(struct sched_domain, phys_domains); -static struct sched_group sched_group_phys[NR_CPUS]; -static int cpu_to_phys_group(int cpu) -{ -#ifdef CONFIG_SCHED_SMT - return first_cpu(cpu_sibling_map[cpu]); -#else - return cpu; -#endif -} - -#ifdef CONFIG_NUMA -/* - * The init_sched_build_groups can't handle what we want to do with node - * groups, so roll our own. Now each node has its own list of groups which - * gets dynamically allocated. - */ -static DEFINE_PER_CPU(struct sched_domain, node_domains); -static struct sched_group *sched_group_nodes[MAX_NUMNODES]; - -static DEFINE_PER_CPU(struct sched_domain, allnodes_domains); -static struct sched_group sched_group_allnodes[MAX_NUMNODES]; - -static int cpu_to_allnodes_group(int cpu) -{ - return cpu_to_node(cpu); -} -#endif - -/* - * Build sched domains for a given set of cpus and attach the sched domains - * to the individual cpus - */ -void build_sched_domains(const cpumask_t *cpu_map) -{ - int i; - - /* - * Set up domains for cpus specified by the cpu_map. - */ - for_each_cpu_mask(i, *cpu_map) { - int group; - struct sched_domain *sd = NULL, *p; - cpumask_t nodemask = node_to_cpumask(cpu_to_node(i)); - - cpus_and(nodemask, nodemask, *cpu_map); - -#ifdef CONFIG_NUMA - if (num_online_cpus() - > SD_NODES_PER_DOMAIN*cpus_weight(nodemask)) { - sd = &per_cpu(allnodes_domains, i); - *sd = SD_ALLNODES_INIT; - sd->span = *cpu_map; - group = cpu_to_allnodes_group(i); - sd->groups = &sched_group_allnodes[group]; - p = sd; - } else - p = NULL; - - sd = &per_cpu(node_domains, i); - *sd = SD_NODE_INIT; - sd->span = sched_domain_node_span(cpu_to_node(i)); - sd->parent = p; - cpus_and(sd->span, sd->span, *cpu_map); -#endif - - p = sd; - sd = &per_cpu(phys_domains, i); - group = cpu_to_phys_group(i); - *sd = SD_CPU_INIT; - sd->span = nodemask; - sd->parent = p; - sd->groups = &sched_group_phys[group]; - -#ifdef CONFIG_SCHED_SMT - p = sd; - sd = &per_cpu(cpu_domains, i); - group = cpu_to_cpu_group(i); - *sd = SD_SIBLING_INIT; - sd->span = cpu_sibling_map[i]; - cpus_and(sd->span, sd->span, *cpu_map); - sd->parent = p; - sd->groups = &sched_group_cpus[group]; -#endif - } - -#ifdef CONFIG_SCHED_SMT - /* Set up CPU (sibling) groups */ - for_each_cpu_mask(i, *cpu_map) { - cpumask_t this_sibling_map = cpu_sibling_map[i]; - cpus_and(this_sibling_map, this_sibling_map, *cpu_map); - if (i != first_cpu(this_sibling_map)) - continue; - - init_sched_build_groups(sched_group_cpus, this_sibling_map, - &cpu_to_cpu_group); - } -#endif - - /* Set up physical groups */ - for (i = 0; i < MAX_NUMNODES; i++) { - cpumask_t nodemask = node_to_cpumask(i); - - cpus_and(nodemask, nodemask, *cpu_map); - if (cpus_empty(nodemask)) - continue; - - init_sched_build_groups(sched_group_phys, nodemask, - &cpu_to_phys_group); - } - -#ifdef CONFIG_NUMA - init_sched_build_groups(sched_group_allnodes, *cpu_map, - &cpu_to_allnodes_group); - - for (i = 0; i < MAX_NUMNODES; i++) { - /* Set up node groups */ - struct sched_group *sg, *prev; - cpumask_t nodemask = node_to_cpumask(i); - cpumask_t domainspan; - cpumask_t covered = CPU_MASK_NONE; - int j; - - cpus_and(nodemask, nodemask, *cpu_map); - if (cpus_empty(nodemask)) - continue; - - domainspan = sched_domain_node_span(i); - cpus_and(domainspan, domainspan, *cpu_map); - - sg = kmalloc(sizeof(struct sched_group), GFP_KERNEL); - sched_group_nodes[i] = sg; - for_each_cpu_mask(j, nodemask) { - struct sched_domain *sd; - sd = &per_cpu(node_domains, j); - sd->groups = sg; - if (sd->groups == NULL) { - /* Turn off balancing if we have no groups */ - sd->flags = 0; - } - } - if (!sg) { - printk(KERN_WARNING - "Can not alloc domain group for node %d\n", i); - continue; - } - sg->cpu_power = 0; - sg->cpumask = nodemask; - cpus_or(covered, covered, nodemask); - prev = sg; - - for (j = 0; j < MAX_NUMNODES; j++) { - cpumask_t tmp, notcovered; - int n = (i + j) % MAX_NUMNODES; - - cpus_complement(notcovered, covered); - cpus_and(tmp, notcovered, *cpu_map); - cpus_and(tmp, tmp, domainspan); - if (cpus_empty(tmp)) - break; - - nodemask = node_to_cpumask(n); - cpus_and(tmp, tmp, nodemask); - if (cpus_empty(tmp)) - continue; - - sg = kmalloc(sizeof(struct sched_group), GFP_KERNEL); - if (!sg) { - printk(KERN_WARNING - "Can not alloc domain group for node %d\n", j); - break; - } - sg->cpu_power = 0; - sg->cpumask = tmp; - cpus_or(covered, covered, tmp); - prev->next = sg; - prev = sg; - } - prev->next = sched_group_nodes[i]; - } -#endif - - /* Calculate CPU power for physical packages and nodes */ - for_each_cpu_mask(i, *cpu_map) { - int power; - struct sched_domain *sd; -#ifdef CONFIG_SCHED_SMT - sd = &per_cpu(cpu_domains, i); - power = SCHED_LOAD_SCALE; - sd->groups->cpu_power = power; -#endif - - sd = &per_cpu(phys_domains, i); - power = SCHED_LOAD_SCALE + SCHED_LOAD_SCALE * - (cpus_weight(sd->groups->cpumask)-1) / 10; - sd->groups->cpu_power = power; - -#ifdef CONFIG_NUMA - sd = &per_cpu(allnodes_domains, i); - if (sd->groups) { - power = SCHED_LOAD_SCALE + SCHED_LOAD_SCALE * - (cpus_weight(sd->groups->cpumask)-1) / 10; - sd->groups->cpu_power = power; - } -#endif - } - -#ifdef CONFIG_NUMA - for (i = 0; i < MAX_NUMNODES; i++) { - struct sched_group *sg = sched_group_nodes[i]; - int j; - - if (sg == NULL) - continue; -next_sg: - for_each_cpu_mask(j, sg->cpumask) { - struct sched_domain *sd; - int power; - - sd = &per_cpu(phys_domains, j); - if (j != first_cpu(sd->groups->cpumask)) { - /* - * Only add "power" once for each - * physical package. - */ - continue; - } - power = SCHED_LOAD_SCALE + SCHED_LOAD_SCALE * - (cpus_weight(sd->groups->cpumask)-1) / 10; - - sg->cpu_power += power; - } - sg = sg->next; - if (sg != sched_group_nodes[i]) - goto next_sg; - } -#endif - - /* Attach the domains */ - for_each_cpu_mask(i, *cpu_map) { - struct sched_domain *sd; -#ifdef CONFIG_SCHED_SMT - sd = &per_cpu(cpu_domains, i); -#else - sd = &per_cpu(phys_domains, i); -#endif - cpu_attach_domain(sd, i); - } -} -/* - * Set up scheduler domains and groups. Callers must hold the hotplug lock. - */ -void arch_init_sched_domains(const cpumask_t *cpu_map) -{ - cpumask_t cpu_default_map; - - /* - * Setup mask for cpus without special case scheduling requirements. - * For now this just excludes isolated cpus, but could be used to - * exclude other special cases in the future. - */ - cpus_andnot(cpu_default_map, *cpu_map, cpu_isolated_map); - - build_sched_domains(&cpu_default_map); -} - -void arch_destroy_sched_domains(const cpumask_t *cpu_map) -{ -#ifdef CONFIG_NUMA - int i; - for (i = 0; i < MAX_NUMNODES; i++) { - cpumask_t nodemask = node_to_cpumask(i); - struct sched_group *oldsg, *sg = sched_group_nodes[i]; - - cpus_and(nodemask, nodemask, *cpu_map); - if (cpus_empty(nodemask)) - continue; - - if (sg == NULL) - continue; - sg = sg->next; -next_sg: - oldsg = sg; - sg = sg->next; - kfree(oldsg); - if (oldsg != sched_group_nodes[i]) - goto next_sg; - sched_group_nodes[i] = NULL; - } -#endif -} - |