diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/Makefile | 2 | ||||
| -rw-r--r-- | mm/maccess.c | 55 | ||||
| -rw-r--r-- | mm/oom_kill.c | 4 | ||||
| -rw-r--r-- | mm/slub.c | 97 | ||||
| -rw-r--r-- | mm/sparse.c | 10 | ||||
| -rw-r--r-- | mm/vmstat.c | 1 |
6 files changed, 133 insertions, 36 deletions
diff --git a/mm/Makefile b/mm/Makefile index a5b0dd93427..18c143b3c46 100644 --- a/mm/Makefile +++ b/mm/Makefile @@ -8,7 +8,7 @@ mmu-$(CONFIG_MMU) := fremap.o highmem.o madvise.o memory.o mincore.o \ vmalloc.o obj-y := bootmem.o filemap.o mempool.o oom_kill.o fadvise.o \ - page_alloc.o page-writeback.o pdflush.o \ + maccess.o page_alloc.o page-writeback.o pdflush.o \ readahead.o swap.o truncate.o vmscan.o \ prio_tree.o util.o mmzone.o vmstat.o backing-dev.o \ page_isolation.o $(mmu-y) diff --git a/mm/maccess.c b/mm/maccess.c new file mode 100644 index 00000000000..ac40796cfb1 --- /dev/null +++ b/mm/maccess.c @@ -0,0 +1,55 @@ +/* + * Access kernel memory without faulting. + */ +#include <linux/uaccess.h> +#include <linux/module.h> +#include <linux/mm.h> + +/** + * probe_kernel_read(): safely attempt to read from a location + * @dst: pointer to the buffer that shall take the data + * @src: address to read from + * @size: size of the data chunk + * + * Safely read from address @src to the buffer at @dst. If a kernel fault + * happens, handle that and return -EFAULT. + */ +long probe_kernel_read(void *dst, void *src, size_t size) +{ + long ret; + mm_segment_t old_fs = get_fs(); + + set_fs(KERNEL_DS); + pagefault_disable(); + ret = __copy_from_user_inatomic(dst, + (__force const void __user *)src, size); + pagefault_enable(); + set_fs(old_fs); + + return ret ? -EFAULT : 0; +} +EXPORT_SYMBOL_GPL(probe_kernel_read); + +/** + * probe_kernel_write(): safely attempt to write to a location + * @dst: address to write to + * @src: pointer to the data that shall be written + * @size: size of the data chunk + * + * Safely write to address @dst from the buffer at @src. If a kernel fault + * happens, handle that and return -EFAULT. + */ +long probe_kernel_write(void *dst, void *src, size_t size) +{ + long ret; + mm_segment_t old_fs = get_fs(); + + set_fs(KERNEL_DS); + pagefault_disable(); + ret = __copy_to_user_inatomic((__force void __user *)dst, src, size); + pagefault_enable(); + set_fs(old_fs); + + return ret ? -EFAULT : 0; +} +EXPORT_SYMBOL_GPL(probe_kernel_write); diff --git a/mm/oom_kill.c b/mm/oom_kill.c index f255eda693b..beb592fe938 100644 --- a/mm/oom_kill.c +++ b/mm/oom_kill.c @@ -423,7 +423,7 @@ void mem_cgroup_out_of_memory(struct mem_cgroup *mem, gfp_t gfp_mask) struct task_struct *p; cgroup_lock(); - rcu_read_lock(); + read_lock(&tasklist_lock); retry: p = select_bad_process(&points, mem); if (PTR_ERR(p) == -1UL) @@ -436,7 +436,7 @@ retry: "Memory cgroup out of memory")) goto retry; out: - rcu_read_unlock(); + read_unlock(&tasklist_lock); cgroup_unlock(); } #endif diff --git a/mm/slub.c b/mm/slub.c index acc975fcc8c..7f8aaa291a4 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -837,6 +837,35 @@ static void remove_full(struct kmem_cache *s, struct page *page) spin_unlock(&n->list_lock); } +/* Tracking of the number of slabs for debugging purposes */ +static inline unsigned long slabs_node(struct kmem_cache *s, int node) +{ + struct kmem_cache_node *n = get_node(s, node); + + return atomic_long_read(&n->nr_slabs); +} + +static inline void inc_slabs_node(struct kmem_cache *s, int node) +{ + struct kmem_cache_node *n = get_node(s, node); + + /* + * May be called early in order to allocate a slab for the + * kmem_cache_node structure. Solve the chicken-egg + * dilemma by deferring the increment of the count during + * bootstrap (see early_kmem_cache_node_alloc). + */ + if (!NUMA_BUILD || n) + atomic_long_inc(&n->nr_slabs); +} +static inline void dec_slabs_node(struct kmem_cache *s, int node) +{ + struct kmem_cache_node *n = get_node(s, node); + + atomic_long_dec(&n->nr_slabs); +} + +/* Object debug checks for alloc/free paths */ static void setup_object_debug(struct kmem_cache *s, struct page *page, void *object) { @@ -1028,6 +1057,11 @@ static inline unsigned long kmem_cache_flags(unsigned long objsize, return flags; } #define slub_debug 0 + +static inline unsigned long slabs_node(struct kmem_cache *s, int node) + { return 0; } +static inline void inc_slabs_node(struct kmem_cache *s, int node) {} +static inline void dec_slabs_node(struct kmem_cache *s, int node) {} #endif /* * Slab allocation and freeing @@ -1066,7 +1100,6 @@ static void setup_object(struct kmem_cache *s, struct page *page, static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) { struct page *page; - struct kmem_cache_node *n; void *start; void *last; void *p; @@ -1078,9 +1111,7 @@ static struct page *new_slab(struct kmem_cache *s, gfp_t flags, int node) if (!page) goto out; - n = get_node(s, page_to_nid(page)); - if (n) - atomic_long_inc(&n->nr_slabs); + inc_slabs_node(s, page_to_nid(page)); page->slab = s; page->flags |= 1 << PG_slab; if (s->flags & (SLAB_DEBUG_FREE | SLAB_RED_ZONE | SLAB_POISON | @@ -1125,6 +1156,8 @@ static void __free_slab(struct kmem_cache *s, struct page *page) NR_SLAB_RECLAIMABLE : NR_SLAB_UNRECLAIMABLE, -pages); + __ClearPageSlab(page); + reset_page_mapcount(page); __free_pages(page, s->order); } @@ -1151,11 +1184,7 @@ static void free_slab(struct kmem_cache *s, struct page *page) static void discard_slab(struct kmem_cache *s, struct page *page) { - struct kmem_cache_node *n = get_node(s, page_to_nid(page)); - - atomic_long_dec(&n->nr_slabs); - reset_page_mapcount(page); - __ClearPageSlab(page); + dec_slabs_node(s, page_to_nid(page)); free_slab(s, page); } @@ -1886,15 +1915,18 @@ static void init_kmem_cache_cpu(struct kmem_cache *s, c->node = 0; c->offset = s->offset / sizeof(void *); c->objsize = s->objsize; +#ifdef CONFIG_SLUB_STATS + memset(c->stat, 0, NR_SLUB_STAT_ITEMS * sizeof(unsigned)); +#endif } static void init_kmem_cache_node(struct kmem_cache_node *n) { n->nr_partial = 0; - atomic_long_set(&n->nr_slabs, 0); spin_lock_init(&n->list_lock); INIT_LIST_HEAD(&n->partial); #ifdef CONFIG_SLUB_DEBUG + atomic_long_set(&n->nr_slabs, 0); INIT_LIST_HEAD(&n->full); #endif } @@ -2063,7 +2095,7 @@ static struct kmem_cache_node *early_kmem_cache_node_alloc(gfp_t gfpflags, init_tracking(kmalloc_caches, n); #endif init_kmem_cache_node(n); - atomic_long_inc(&n->nr_slabs); + inc_slabs_node(kmalloc_caches, node); /* * lockdep requires consistent irq usage for each lock @@ -2376,7 +2408,7 @@ static inline int kmem_cache_close(struct kmem_cache *s) struct kmem_cache_node *n = get_node(s, node); n->nr_partial -= free_list(s, n, &n->partial); - if (atomic_long_read(&n->nr_slabs)) + if (slabs_node(s, node)) return 1; } free_kmem_cache_nodes(s); @@ -2409,10 +2441,6 @@ EXPORT_SYMBOL(kmem_cache_destroy); struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1] __cacheline_aligned; EXPORT_SYMBOL(kmalloc_caches); -#ifdef CONFIG_ZONE_DMA -static struct kmem_cache *kmalloc_caches_dma[PAGE_SHIFT + 1]; -#endif - static int __init setup_slub_min_order(char *str) { get_option(&str, &slub_min_order); @@ -2472,6 +2500,7 @@ panic: } #ifdef CONFIG_ZONE_DMA +static struct kmem_cache *kmalloc_caches_dma[PAGE_SHIFT + 1]; static void sysfs_add_func(struct work_struct *w) { @@ -2688,21 +2717,6 @@ void kfree(const void *x) } EXPORT_SYMBOL(kfree); -#if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SLABINFO) -static unsigned long count_partial(struct kmem_cache_node *n) -{ - unsigned long flags; - unsigned long x = 0; - struct page *page; - - spin_lock_irqsave(&n->list_lock, flags); - list_for_each_entry(page, &n->partial, lru) - x += page->inuse; - spin_unlock_irqrestore(&n->list_lock, flags); - return x; -} -#endif - /* * kmem_cache_shrink removes empty slabs from the partial lists and sorts * the remaining slabs by the number of items in use. The slabs with the @@ -2816,7 +2830,7 @@ static void slab_mem_offline_callback(void *arg) * and offline_pages() function shoudn't call this * callback. So, we must fail. */ - BUG_ON(atomic_long_read(&n->nr_slabs)); + BUG_ON(slabs_node(s, offline_node)); s->node[offline_node] = NULL; kmem_cache_free(kmalloc_caches, n); @@ -3181,6 +3195,21 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags, return slab_alloc(s, gfpflags, node, caller); } +#if (defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG)) || defined(CONFIG_SLABINFO) +static unsigned long count_partial(struct kmem_cache_node *n) +{ + unsigned long flags; + unsigned long x = 0; + struct page *page; + + spin_lock_irqsave(&n->list_lock, flags); + list_for_each_entry(page, &n->partial, lru) + x += page->inuse; + spin_unlock_irqrestore(&n->list_lock, flags); + return x; +} +#endif + #if defined(CONFIG_SYSFS) && defined(CONFIG_SLUB_DEBUG) static int validate_slab(struct kmem_cache *s, struct page *page, unsigned long *map) @@ -3979,10 +4008,12 @@ static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) len = sprintf(buf, "%lu", sum); +#ifdef CONFIG_SMP for_each_online_cpu(cpu) { if (data[cpu] && len < PAGE_SIZE - 20) - len += sprintf(buf + len, " c%d=%u", cpu, data[cpu]); + len += sprintf(buf + len, " C%d=%u", cpu, data[cpu]); } +#endif kfree(data); return len + sprintf(buf + len, "\n"); } diff --git a/mm/sparse.c b/mm/sparse.c index f6a43c09c32..98d6b39c347 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -149,8 +149,18 @@ static inline int sparse_early_nid(struct mem_section *section) /* Record a memory area against a node. */ void __init memory_present(int nid, unsigned long start, unsigned long end) { + unsigned long max_arch_pfn = 1UL << (MAX_PHYSMEM_BITS-PAGE_SHIFT); unsigned long pfn; + /* + * Sanity checks - do not allow an architecture to pass + * in larger pfns than the maximum scope of sparsemem: + */ + if (start >= max_arch_pfn) + return; + if (end >= max_arch_pfn) + end = max_arch_pfn; + start &= PAGE_SECTION_MASK; for (pfn = start; pfn < end; pfn += PAGES_PER_SECTION) { unsigned long section = pfn_to_section_nr(pfn); diff --git a/mm/vmstat.c b/mm/vmstat.c index 422d960ffcd..7c7286e9506 100644 --- a/mm/vmstat.c +++ b/mm/vmstat.c @@ -388,6 +388,7 @@ static char * const migratetype_names[MIGRATE_TYPES] = { "Reclaimable", "Movable", "Reserve", + "Isolate", }; static void *frag_start(struct seq_file *m, loff_t *pos) |