* Consolidate node_to_cpumask operations and remove the 256k byte node_to_cpumask_map. This is done by allocating the node_to_cpumask_map array after the number of possible nodes (nr_node_ids) is known. * Debug printouts when CONFIG_DEBUG_PER_CPU_MAPS is active have been increased. It now shows faults when calling node_to_cpumask() and node_to_cpumask_ptr(). For inclusion into sched-devel/latest tree. Based on: git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux-2.6.git + sched-devel/latest .../mingo/linux-2.6-sched-devel.git Signed-off-by: Mike Travis --- arch/x86/kernel/setup.c | 137 +++++++++++++++++++++++++++++++++++++++++++-- arch/x86/mm/numa_64.c | 6 - include/asm-x86/topology.h | 25 +++++--- 3 files changed, 149 insertions(+), 19 deletions(-) --- linux-2.6.sched.orig/arch/x86/kernel/setup.c +++ linux-2.6.sched/arch/x86/kernel/setup.c @@ -28,12 +28,27 @@ DEFINE_EARLY_PER_CPU(u16, x86_bios_cpu_a EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_apicid); EXPORT_EARLY_PER_CPU_SYMBOL(x86_bios_cpu_apicid); +#ifdef CONFIG_DEBUG_PER_CPU_MAPS +#undef Dprintk +#define Dprintk printk +#endif + #if defined(CONFIG_NUMA) && defined(CONFIG_X86_64) #define X86_64_NUMA 1 /* map cpu index to node index */ DEFINE_EARLY_PER_CPU(int, x86_cpu_to_node_map, NUMA_NO_NODE); EXPORT_EARLY_PER_CPU_SYMBOL(x86_cpu_to_node_map); + +/* which logical CPUs are on which nodes */ +cpumask_t *node_to_cpumask_map; +EXPORT_SYMBOL(node_to_cpumask_map); + +/* setup node_to_cpumask_map */ +static void __init setup_node_to_cpumask_map(void); + +#else +static inline void setup_node_to_cpumask_map(void) { } #endif #ifdef CONFIG_HAVE_SETUP_PER_CPU_AREA @@ -139,11 +154,15 @@ void __init setup_per_cpu_areas(void) } nr_cpu_ids = highest_cpu + 1; - printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d\n", NR_CPUS, nr_cpu_ids); + printk(KERN_DEBUG "NR_CPUS: %d, nr_cpu_ids: %d, nr_node_ids %d\n", + NR_CPUS, nr_cpu_ids, nr_node_ids); /* Setup percpu data maps */ setup_per_cpu_maps(); + /* Setup node to cpumask map */ + setup_node_to_cpumask_map(); + /* Setup cpumask_of_cpu map */ setup_cpumask_of_cpu(); } @@ -151,6 +170,35 @@ void __init setup_per_cpu_areas(void) #endif #ifdef X86_64_NUMA + +/* + * Allocate node_to_cpumask_map based on number of available nodes + * Requires node_possible_map to be valid. + * + * Note: node_to_cpumask() is not valid until after this is done. + */ +static void __init setup_node_to_cpumask_map(void) +{ + unsigned int node, num = 0; + cpumask_t *map; + + /* setup nr_node_ids if not done yet */ + if (nr_node_ids == MAX_NUMNODES) { + for_each_node_mask(node, node_possible_map) + num = node; + nr_node_ids = num + 1; + } + + /* allocate the map */ + map = alloc_bootmem_low(nr_node_ids * sizeof(cpumask_t)); + + Dprintk(KERN_DEBUG "== setup_node_to_cpumask_map %p (%d)\n", + map, nr_node_ids); + + /* node_to_cpumask() will now work */ + node_to_cpumask_map = map; +} + void __cpuinit numa_set_node(int cpu, int node) { int *cpu_to_node_map = early_per_cpu_ptr(x86_cpu_to_node_map); @@ -173,6 +221,8 @@ void __cpuinit numa_clear_node(int cpu) numa_set_node(cpu, NUMA_NO_NODE); } +#ifndef CONFIG_DEBUG_PER_CPU_MAPS + void __cpuinit numa_add_cpu(int cpu) { cpu_set(cpu, node_to_cpumask_map[early_cpu_to_node(cpu)]); @@ -182,9 +232,44 @@ void __cpuinit numa_remove_cpu(int cpu) { cpu_clear(cpu, node_to_cpumask_map[cpu_to_node(cpu)]); } -#endif /* CONFIG_NUMA */ -#if defined(CONFIG_DEBUG_PER_CPU_MAPS) && defined(CONFIG_X86_64) +#else /* CONFIG_DEBUG_PER_CPU_MAPS */ + +/* + * --------- debug versions of the numa functions --------- + */ +static void __cpuinit numa_set_cpumask(int cpu, int enable) +{ + int node = cpu_to_node(cpu); + cpumask_t *mask; + char buf[32]; + + if (node_to_cpumask_map == NULL) { + printk(KERN_DEBUG "== node_to_cpumask_map NULL!\n"); + dump_stack(); + return; + } + + mask = &node_to_cpumask_map[node]; + if (enable) + cpu_set(cpu, *mask); + else + cpu_clear(cpu, *mask); + + cpulist_scnprintf(buf, sizeof(buf), *mask); + printk(KERN_DEBUG "== %s cpu %d node %d: mask now %s\n", + enable? "numa_add_cpu":"numa_remove_cpu", cpu, node, buf); + } + +void __cpuinit numa_add_cpu(int cpu) +{ + numa_set_cpumask(cpu, 1); +} + +void __cpuinit numa_remove_cpu(int cpu) +{ + numa_set_cpumask(cpu, 0); +} int cpu_to_node(int cpu) { @@ -198,6 +283,10 @@ int cpu_to_node(int cpu) } EXPORT_SYMBOL(cpu_to_node); +/* + * Same function as cpu_to_node() but used if called before the + * per_cpu areas are setup. + */ int early_cpu_to_node(int cpu) { if (early_per_cpu_ptr(x86_cpu_to_node_map)) @@ -206,9 +295,47 @@ int early_cpu_to_node(int cpu) if (!per_cpu_offset(cpu)) { printk(KERN_WARNING "early_cpu_to_node(%d): no per_cpu area!\n", cpu); - dump_stack(); + dump_stack(); return NUMA_NO_NODE; } return per_cpu(x86_cpu_to_node_map, cpu); } -#endif + +/* + * Returns a pointer to the bitmask of CPUs on Node 'node'. + */ +cpumask_t *_node_to_cpumask_ptr(int node) +{ + if (node_to_cpumask_map == NULL) { + printk(KERN_WARNING + "_node_to_cpumask_ptr(%d): no node_to_cpumask_map!\n", + node); + dump_stack(); + return &cpu_online_map; + } + return &node_to_cpumask_map[node]; +} +EXPORT_SYMBOL(_node_to_cpumask_ptr); + +/* + * Returns a bitmask of CPUs on Node 'node'. + */ +cpumask_t node_to_cpumask(int node) +{ + if (node_to_cpumask_map == NULL) { + printk(KERN_WARNING + "node_to_cpumask(%d): no node_to_cpumask_map!\n", node); + dump_stack(); + return cpu_online_map; + } + return node_to_cpumask_map[node]; +} +EXPORT_SYMBOL(node_to_cpumask); + +/* + * --------- end of debug versions of the numa functions --------- + */ + +#endif /* CONFIG_DEBUG_PER_CPU_MAPS */ + +#endif /* X86_64_NUMA */ --- linux-2.6.sched.orig/arch/x86/mm/numa_64.c +++ linux-2.6.sched/arch/x86/mm/numa_64.c @@ -35,9 +35,6 @@ s16 apicid_to_node[MAX_LOCAL_APIC] __cpu [0 ... MAX_LOCAL_APIC-1] = NUMA_NO_NODE }; -cpumask_t node_to_cpumask_map[MAX_NUMNODES] __read_mostly; -EXPORT_SYMBOL(node_to_cpumask_map); - int numa_off __initdata; unsigned long __initdata nodemap_addr; unsigned long __initdata nodemap_size; @@ -561,9 +558,6 @@ void __init numa_initmem_init(unsigned l node_set(0, node_possible_map); for (i = 0; i < NR_CPUS; i++) numa_set_node(i, 0); - /* cpumask_of_cpu() may not be available during early startup */ - memset(&node_to_cpumask_map[0], 0, sizeof(node_to_cpumask_map[0])); - cpu_set(0, node_to_cpumask_map[0]); e820_register_active_regions(0, start_pfn, end_pfn); setup_node_bootmem(0, start_pfn << PAGE_SHIFT, end_pfn << PAGE_SHIFT); } --- linux-2.6.sched.orig/include/asm-x86/topology.h +++ linux-2.6.sched/include/asm-x86/topology.h @@ -47,10 +47,16 @@ static inline int cpu_to_node(int cpu) } #define early_cpu_to_node(cpu) cpu_to_node(cpu) +/* Returns a bitmask of CPUs on Node 'node'. */ +static inline cpumask_t node_to_cpumask(int node) +{ + return node_to_cpumask_map[node]; +} + #else /* CONFIG_X86_64 */ /* Mappings between node number and cpus on that node. */ -extern cpumask_t node_to_cpumask_map[]; +extern cpumask_t *node_to_cpumask_map; /* Mappings between logical cpu number and node number */ DECLARE_EARLY_PER_CPU(int, x86_cpu_to_node_map); @@ -94,7 +100,6 @@ static inline cpumask_t node_to_cpumask( } #endif /* !CONFIG_DEBUG_PER_CPU_MAPS */ -#endif /* CONFIG_X86_64 */ /* Replace default node_to_cpumask_ptr with optimized version */ #define node_to_cpumask_ptr(v, node) \ @@ -103,12 +108,7 @@ static inline cpumask_t node_to_cpumask( #define node_to_cpumask_ptr_next(v, node) \ v = _node_to_cpumask_ptr(node) -/* Returns the number of the first CPU on Node 'node'. */ -static inline int node_to_first_cpu(int node) -{ - node_to_cpumask_ptr(mask, node); - return first_cpu(*mask); -} +#endif /* CONFIG_X86_64 */ /* * Returns the number of the node containing Node 'node'. This @@ -195,6 +195,15 @@ static inline int node_to_first_cpu(int #include +#ifdef CONFIG_NUMA +/* Returns the number of the first CPU on Node 'node'. */ +static inline int node_to_first_cpu(int node) +{ + node_to_cpumask_ptr(mask, node); + return first_cpu(*mask); +} +#endif + extern cpumask_t cpu_coregroup_map(int cpu); #ifdef ENABLE_TOPO_DEFINES -- -- 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/