* Change fixed size arrays to per_cpu variables or dynamically allocated arrays in sched_init() and sched_init_smp(). (1) static struct sched_entity *init_sched_entity_p[NR_CPUS]; (1) static struct cfs_rq *init_cfs_rq_p[NR_CPUS]; (1) static struct sched_rt_entity *init_sched_rt_entity_p[NR_CPUS]; (1) static struct rt_rq *init_rt_rq_p[NR_CPUS]; static struct sched_group **sched_group_nodes_bycpu[NR_CPUS]; (1) - these arrays are allocated via alloc_bootmem_low() * Change sched_domain_debug_one() to use cpulist_scnprintf instead of cpumask_scnprintf. This reduces the output buffer required and improves readability when large NR_CPU count machines arrive. * In sched_create_group() we allocate new arrays based on nr_cpu_ids. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + x86/latest .../x86/linux-2.6-x86.git + sched-devel/latest .../mingo/linux-2.6-sched-devel.git Cc: Ingo Molnar Signed-off-by: Mike Travis --- v2: Removed reference to cpumask_scnprintf_len(). --- kernel/sched.c | 80 +++++++++++++++++++++++++++++++++++++-------------------- 1 file changed, 52 insertions(+), 28 deletions(-) --- linux-2.6.x86.orig/kernel/sched.c +++ linux-2.6.x86/kernel/sched.c @@ -68,6 +68,7 @@ #include #include #include +#include #include #include @@ -278,17 +279,11 @@ struct task_group { static DEFINE_PER_CPU(struct sched_entity, init_sched_entity); /* Default task group's cfs_rq on each cpu */ static DEFINE_PER_CPU(struct cfs_rq, init_cfs_rq) ____cacheline_aligned_in_smp; - -static struct sched_entity *init_sched_entity_p[NR_CPUS]; -static struct cfs_rq *init_cfs_rq_p[NR_CPUS]; #endif #ifdef CONFIG_RT_GROUP_SCHED static DEFINE_PER_CPU(struct sched_rt_entity, init_sched_rt_entity); static DEFINE_PER_CPU(struct rt_rq, init_rt_rq) ____cacheline_aligned_in_smp; - -static struct sched_rt_entity *init_sched_rt_entity_p[NR_CPUS]; -static struct rt_rq *init_rt_rq_p[NR_CPUS]; #endif /* task_group_lock serializes add/remove of task groups and also changes to @@ -312,17 +307,7 @@ static int init_task_group_load = INIT_T /* Default task group. * Every task in system belong to this group at bootup. */ -struct task_group init_task_group = { -#ifdef CONFIG_FAIR_GROUP_SCHED - .se = init_sched_entity_p, - .cfs_rq = init_cfs_rq_p, -#endif - -#ifdef CONFIG_RT_GROUP_SCHED - .rt_se = init_sched_rt_entity_p, - .rt_rq = init_rt_rq_p, -#endif -}; +struct task_group init_task_group; /* return group to which a task belongs */ static inline struct task_group *task_group(struct task_struct *p) @@ -3754,7 +3739,7 @@ static inline void trigger_load_balance( */ int ilb = first_cpu(nohz.cpu_mask); - if (ilb != NR_CPUS) + if (ilb < nr_cpu_ids) resched_cpu(ilb); } } @@ -5729,11 +5714,11 @@ static void move_task_off_dead_cpu(int d dest_cpu = any_online_cpu(mask); /* On any allowed CPU? */ - if (dest_cpu == NR_CPUS) + if (dest_cpu >= nr_cpu_ids) dest_cpu = any_online_cpu(p->cpus_allowed); /* No more Mr. Nice Guy. */ - if (dest_cpu == NR_CPUS) { + if (dest_cpu >= nr_cpu_ids) { cpumask_t cpus_allowed = cpuset_cpus_allowed_locked(p); /* * Try to stay on the same cpuset, where the @@ -6188,9 +6173,9 @@ static int sched_domain_debug_one(struct { struct sched_group *group = sd->groups; cpumask_t groupmask; - char str[NR_CPUS]; + char str[256]; - cpumask_scnprintf(str, NR_CPUS, sd->span); + cpulist_scnprintf(str, sizeof(str), sd->span); cpus_clear(groupmask); printk(KERN_DEBUG "%*s domain %d: ", level, "", level); @@ -6243,7 +6228,7 @@ static int sched_domain_debug_one(struct cpus_or(groupmask, groupmask, group->cpumask); - cpumask_scnprintf(str, NR_CPUS, group->cpumask); + cpulist_scnprintf(str, sizeof(str), group->cpumask); printk(KERN_CONT " %s", str); group = group->next; @@ -6637,7 +6622,7 @@ cpu_to_phys_group(int cpu, const cpumask * gets dynamically allocated. */ static DEFINE_PER_CPU(struct sched_domain, node_domains); -static struct sched_group **sched_group_nodes_bycpu[NR_CPUS]; +static struct sched_group ***sched_group_nodes_bycpu; static DEFINE_PER_CPU(struct sched_domain, allnodes_domains); static DEFINE_PER_CPU(struct sched_group, sched_group_allnodes); @@ -7280,6 +7265,11 @@ void __init sched_init_smp(void) { cpumask_t non_isolated_cpus; +#if defined(CONFIG_NUMA) + sched_group_nodes_bycpu = kzalloc(nr_cpu_ids * sizeof(void **), + GFP_KERNEL); + BUG_ON(sched_group_nodes_bycpu == NULL); +#endif get_online_cpus(); arch_init_sched_domains(&cpu_online_map); non_isolated_cpus = cpu_possible_map; @@ -7297,6 +7287,11 @@ void __init sched_init_smp(void) #else void __init sched_init_smp(void) { +#if defined(CONFIG_NUMA) + sched_group_nodes_bycpu = kzalloc(nr_cpu_ids * sizeof(void **), + GFP_KERNEL); + BUG_ON(sched_group_nodes_bycpu == NULL); +#endif sched_init_granularity(); } #endif /* CONFIG_SMP */ @@ -7393,6 +7388,35 @@ static void init_tg_rt_entry(struct rq * void __init sched_init(void) { int i, j; + unsigned long alloc_size = 0, ptr; + +#ifdef CONFIG_FAIR_GROUP_SCHED + alloc_size += 2 * nr_cpu_ids * sizeof(void **); +#endif +#ifdef CONFIG_RT_GROUP_SCHED + alloc_size += 2 * nr_cpu_ids * sizeof(void **); +#endif + /* + * As sched_init() is called before page_alloc is setup, + * we use alloc_bootmem(). + */ + if (alloc_size) { + ptr = (unsigned long)alloc_bootmem_low(alloc_size); + +#ifdef CONFIG_FAIR_GROUP_SCHED + init_task_group.se = (struct sched_entity **)ptr; + ptr += nr_cpu_ids * sizeof(void **); + + init_task_group.cfs_rq = (struct cfs_rq **)ptr; + ptr += nr_cpu_ids * sizeof(void **); +#endif +#ifdef CONFIG_RT_GROUP_SCHED + init_task_group.rt_se = (struct sched_rt_entity **)ptr; + ptr += nr_cpu_ids * sizeof(void **); + + init_task_group.rt_rq = (struct rt_rq **)ptr; +#endif + } #ifdef CONFIG_SMP init_defrootdomain(); @@ -7643,10 +7667,10 @@ static int alloc_fair_sched_group(struct struct rq *rq; int i; - tg->cfs_rq = kzalloc(sizeof(cfs_rq) * NR_CPUS, GFP_KERNEL); + tg->cfs_rq = kzalloc(sizeof(cfs_rq) * nr_cpu_ids, GFP_KERNEL); if (!tg->cfs_rq) goto err; - tg->se = kzalloc(sizeof(se) * NR_CPUS, GFP_KERNEL); + tg->se = kzalloc(sizeof(se) * nr_cpu_ids, GFP_KERNEL); if (!tg->se) goto err; @@ -7728,10 +7752,10 @@ static int alloc_rt_sched_group(struct t struct rq *rq; int i; - tg->rt_rq = kzalloc(sizeof(rt_rq) * NR_CPUS, GFP_KERNEL); + tg->rt_rq = kzalloc(sizeof(rt_rq) * nr_cpu_ids, GFP_KERNEL); if (!tg->rt_rq) goto err; - tg->rt_se = kzalloc(sizeof(rt_se) * NR_CPUS, GFP_KERNEL); + tg->rt_se = kzalloc(sizeof(rt_se) * nr_cpu_ids, GFP_KERNEL); if (!tg->rt_se) goto err; -- -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/