diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Makefile | 2 | ||||
| -rw-r--r-- | mm/allocpercpu.c | 129 | ||||
| -rw-r--r-- | mm/slab.c | 124 | ||||
| -rw-r--r-- | mm/slob.c | 45 |
4 files changed, 130 insertions, 170 deletions
diff --git a/mm/Makefile b/mm/Makefile index 9dd824c..60c56c0 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -23,4 +23,4 @@ obj-$(CONFIG_SLAB) += slab.o obj-$(CONFIG_MEMORY_HOTPLUG) += memory_hotplug.o obj-$(CONFIG_FS_XIP) += filemap_xip.o obj-$(CONFIG_MIGRATION) += migrate.o - +obj-$(CONFIG_SMP) += allocpercpu.o diff --git a/mm/allocpercpu.c b/mm/allocpercpu.c new file mode 100644 index 0000000..eaa9abe --- /dev/null +++ b/mm/allocpercpu.c @@ -0,0 +1,129 @@ +/* + * linux/mm/allocpercpu.c + * + * Separated from slab.c August 11, 2006 Christoph Lameter <clameter@sgi.com> + */ +#include <linux/mm.h> +#include <linux/module.h> + +/** + * percpu_depopulate - depopulate per-cpu data for given cpu + * @__pdata: per-cpu data to depopulate + * @cpu: depopulate per-cpu data for this cpu + * + * Depopulating per-cpu data for a cpu going offline would be a typical + * use case. You need to register a cpu hotplug handler for that purpose. + */ +void percpu_depopulate(void *__pdata, int cpu) +{ + struct percpu_data *pdata = __percpu_disguise(__pdata); + if (pdata->ptrs[cpu]) { + kfree(pdata->ptrs[cpu]); + pdata->ptrs[cpu] = NULL; + } +} +EXPORT_SYMBOL_GPL(percpu_depopulate); + +/** + * percpu_depopulate_mask - depopulate per-cpu data for some cpu's + * @__pdata: per-cpu data to depopulate + * @mask: depopulate per-cpu data for cpu's selected through mask bits + */ +void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask) +{ + int cpu; + for_each_cpu_mask(cpu, *mask) + percpu_depopulate(__pdata, cpu); +} +EXPORT_SYMBOL_GPL(__percpu_depopulate_mask); + +/** + * percpu_populate - populate per-cpu data for given cpu + * @__pdata: per-cpu data to populate further + * @size: size of per-cpu object + * @gfp: may sleep or not etc. + * @cpu: populate per-data for this cpu + * + * Populating per-cpu data for a cpu coming online would be a typical + * use case. You need to register a cpu hotplug handler for that purpose. + * Per-cpu object is populated with zeroed buffer. + */ +void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu) +{ + struct percpu_data *pdata = __percpu_disguise(__pdata); + int node = cpu_to_node(cpu); + + BUG_ON(pdata->ptrs[cpu]); + if (node_online(node)) { + /* FIXME: kzalloc_node(size, gfp, node) */ + pdata->ptrs[cpu] = kmalloc_node(size, gfp, node); + if (pdata->ptrs[cpu]) + memset(pdata->ptrs[cpu], 0, size); + } else + pdata->ptrs[cpu] = kzalloc(size, gfp); + return pdata->ptrs[cpu]; +} +EXPORT_SYMBOL_GPL(percpu_populate); + +/** + * percpu_populate_mask - populate per-cpu data for more cpu's + * @__pdata: per-cpu data to populate further + * @size: size of per-cpu object + * @gfp: may sleep or not etc. + * @mask: populate per-cpu data for cpu's selected through mask bits + * + * Per-cpu objects are populated with zeroed buffers. + */ +int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp, + cpumask_t *mask) +{ + cpumask_t populated = CPU_MASK_NONE; + int cpu; + + for_each_cpu_mask(cpu, *mask) + if (unlikely(!percpu_populate(__pdata, size, gfp, cpu))) { + __percpu_depopulate_mask(__pdata, &populated); + return -ENOMEM; + } else + cpu_set(cpu, populated); + return 0; +} +EXPORT_SYMBOL_GPL(__percpu_populate_mask); + +/** + * percpu_alloc_mask - initial setup of per-cpu data + * @size: size of per-cpu object + * @gfp: may sleep or not etc. + * @mask: populate per-data for cpu's selected through mask bits + * + * Populating per-cpu data for all online cpu's would be a typical use case, + * which is simplified by the percpu_alloc() wrapper. + * Per-cpu objects are populated with zeroed buffers. + */ +void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask) +{ + void *pdata = kzalloc(sizeof(struct percpu_data), gfp); + void *__pdata = __percpu_disguise(pdata); + + if (unlikely(!pdata)) + return NULL; + if (likely(!__percpu_populate_mask(__pdata, size, gfp, mask))) + return __pdata; + kfree(pdata); + return NULL; +} +EXPORT_SYMBOL_GPL(__percpu_alloc_mask); + +/** + * percpu_free - final cleanup of per-cpu data + * @__pdata: object to clean up + * + * We simply clean up any per-cpu object left. No need for the client to + * track and specify through a bis mask which per-cpu objects are to free. + */ +void percpu_free(void *__pdata) +{ + __percpu_depopulate_mask(__pdata, &cpu_possible_map); + kfree(__percpu_disguise(__pdata)); +} +EXPORT_SYMBOL_GPL(percpu_free); @@ -3440,130 +3440,6 @@ void *__kmalloc_track_caller(size_t size, gfp_t flags, void *caller) EXPORT_SYMBOL(__kmalloc_track_caller); #endif -#ifdef CONFIG_SMP -/** - * percpu_depopulate - depopulate per-cpu data for given cpu - * @__pdata: per-cpu data to depopulate - * @cpu: depopulate per-cpu data for this cpu - * - * Depopulating per-cpu data for a cpu going offline would be a typical - * use case. You need to register a cpu hotplug handler for that purpose. - */ -void percpu_depopulate(void *__pdata, int cpu) -{ - struct percpu_data *pdata = __percpu_disguise(__pdata); - if (pdata->ptrs[cpu]) { - kfree(pdata->ptrs[cpu]); - pdata->ptrs[cpu] = NULL; - } -} -EXPORT_SYMBOL_GPL(percpu_depopulate); - -/** - * percpu_depopulate_mask - depopulate per-cpu data for some cpu's - * @__pdata: per-cpu data to depopulate - * @mask: depopulate per-cpu data for cpu's selected through mask bits - */ -void __percpu_depopulate_mask(void *__pdata, cpumask_t *mask) -{ - int cpu; - for_each_cpu_mask(cpu, *mask) - percpu_depopulate(__pdata, cpu); -} -EXPORT_SYMBOL_GPL(__percpu_depopulate_mask); - -/** - * percpu_populate - populate per-cpu data for given cpu - * @__pdata: per-cpu data to populate further - * @size: size of per-cpu object - * @gfp: may sleep or not etc. - * @cpu: populate per-data for this cpu - * - * Populating per-cpu data for a cpu coming online would be a typical - * use case. You need to register a cpu hotplug handler for that purpose. - * Per-cpu object is populated with zeroed buffer. - */ -void *percpu_populate(void *__pdata, size_t size, gfp_t gfp, int cpu) -{ - struct percpu_data *pdata = __percpu_disguise(__pdata); - int node = cpu_to_node(cpu); - - BUG_ON(pdata->ptrs[cpu]); - if (node_online(node)) { - /* FIXME: kzalloc_node(size, gfp, node) */ - pdata->ptrs[cpu] = kmalloc_node(size, gfp, node); - if (pdata->ptrs[cpu]) - memset(pdata->ptrs[cpu], 0, size); - } else - pdata->ptrs[cpu] = kzalloc(size, gfp); - return pdata->ptrs[cpu]; -} -EXPORT_SYMBOL_GPL(percpu_populate); - -/** - * percpu_populate_mask - populate per-cpu data for more cpu's - * @__pdata: per-cpu data to populate further - * @size: size of per-cpu object - * @gfp: may sleep or not etc. - * @mask: populate per-cpu data for cpu's selected through mask bits - * - * Per-cpu objects are populated with zeroed buffers. - */ -int __percpu_populate_mask(void *__pdata, size_t size, gfp_t gfp, - cpumask_t *mask) -{ - cpumask_t populated = CPU_MASK_NONE; - int cpu; - - for_each_cpu_mask(cpu, *mask) - if (unlikely(!percpu_populate(__pdata, size, gfp, cpu))) { - __percpu_depopulate_mask(__pdata, &populated); - return -ENOMEM; - } else - cpu_set(cpu, populated); - return 0; -} -EXPORT_SYMBOL_GPL(__percpu_populate_mask); - -/** - * percpu_alloc_mask - initial setup of per-cpu data - * @size: size of per-cpu object - * @gfp: may sleep or not etc. - * @mask: populate per-data for cpu's selected through mask bits - * - * Populating per-cpu data for all online cpu's would be a typical use case, - * which is simplified by the percpu_alloc() wrapper. - * Per-cpu objects are populated with zeroed buffers. - */ -void *__percpu_alloc_mask(size_t size, gfp_t gfp, cpumask_t *mask) -{ - void *pdata = kzalloc(sizeof(struct percpu_data), gfp); - void *__pdata = __percpu_disguise(pdata); - - if (unlikely(!pdata)) - return NULL; - if (likely(!__percpu_populate_mask(__pdata, size, gfp, mask))) - return __pdata; - kfree(pdata); - return NULL; -} -EXPORT_SYMBOL_GPL(__percpu_alloc_mask); - -/** - * percpu_free - final cleanup of per-cpu data - * @__pdata: object to clean up - * - * We simply clean up any per-cpu object left. No need for the client to - * track and specify through a bis mask which per-cpu objects are to free. - */ -void percpu_free(void *__pdata) -{ - __percpu_depopulate_mask(__pdata, &cpu_possible_map); - kfree(__percpu_disguise(__pdata)); -} -EXPORT_SYMBOL_GPL(percpu_free); -#endif /* CONFIG_SMP */ - /** * kmem_cache_free - Deallocate an object * @cachep: The cache the allocation was from. @@ -343,48 +343,3 @@ void kmem_cache_init(void) atomic_t slab_reclaim_pages = ATOMIC_INIT(0); EXPORT_SYMBOL(slab_reclaim_pages); -#ifdef CONFIG_SMP - -void *__alloc_percpu(size_t size) -{ - int i; - struct percpu_data *pdata = kmalloc(sizeof (*pdata), GFP_KERNEL); - - if (!pdata) - return NULL; - - for_each_possible_cpu(i) { - pdata->ptrs[i] = kmalloc(size, GFP_KERNEL); - if (!pdata->ptrs[i]) - goto unwind_oom; - memset(pdata->ptrs[i], 0, size); - } - - /* Catch derefs w/o wrappers */ - return (void *) (~(unsigned long) pdata); - -unwind_oom: - while (--i >= 0) { - if (!cpu_possible(i)) - continue; - kfree(pdata->ptrs[i]); - } - kfree(pdata); - return NULL; -} -EXPORT_SYMBOL(__alloc_percpu); - -void -free_percpu(const void *objp) -{ - int i; - struct percpu_data *p = (struct percpu_data *) (~(unsigned long) objp); - - for_each_possible_cpu(i) - kfree(p->ptrs[i]); - - kfree(p); -} -EXPORT_SYMBOL(free_percpu); - -#endif |
