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Merge branch 'slab-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm
* 'slab-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/christoph/vm: slub: Support 4k kmallocs again to compensate for page allocator slowness slub: Fallback to kmalloc_large for failing higher order allocs slub: Determine gfpflags once and not every time a slab is allocated make slub.c:slab_address() static slub: kmalloc page allocator pass-through cleanup slab: avoid double initialization & do initialization in 1 place
This commit is contained in:
Linus Torvalds
commit
f527cf4050
3 changed files with 75 additions and 37 deletions
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@ -71,6 +71,7 @@ struct kmem_cache {
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/* Allocation and freeing of slabs */
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int objects; /* Number of objects in slab */
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gfp_t allocflags; /* gfp flags to use on each alloc */
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int refcount; /* Refcount for slab cache destroy */
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void (*ctor)(struct kmem_cache *, void *);
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int inuse; /* Offset to metadata */
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@ -110,7 +111,7 @@ struct kmem_cache {
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* We keep the general caches in an array of slab caches that are used for
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* 2^x bytes of allocations.
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*/
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extern struct kmem_cache kmalloc_caches[PAGE_SHIFT];
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extern struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1];
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/*
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* Sorry that the following has to be that ugly but some versions of GCC
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@ -188,12 +189,16 @@ static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
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void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
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void *__kmalloc(size_t size, gfp_t flags);
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static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
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{
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return (void *)__get_free_pages(flags | __GFP_COMP, get_order(size));
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}
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static __always_inline void *kmalloc(size_t size, gfp_t flags)
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{
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if (__builtin_constant_p(size)) {
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if (size > PAGE_SIZE / 2)
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return (void *)__get_free_pages(flags | __GFP_COMP,
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get_order(size));
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if (size > PAGE_SIZE)
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return kmalloc_large(size, flags);
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if (!(flags & SLUB_DMA)) {
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struct kmem_cache *s = kmalloc_slab(size);
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@ -214,7 +219,7 @@ void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
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static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
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{
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if (__builtin_constant_p(size) &&
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size <= PAGE_SIZE / 2 && !(flags & SLUB_DMA)) {
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size <= PAGE_SIZE && !(flags & SLUB_DMA)) {
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struct kmem_cache *s = kmalloc_slab(size);
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if (!s)
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@ -2630,6 +2630,7 @@ static struct slab *alloc_slabmgmt(struct kmem_cache *cachep, void *objp,
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slabp->colouroff = colour_off;
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slabp->s_mem = objp + colour_off;
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slabp->nodeid = nodeid;
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slabp->free = 0;
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return slabp;
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}
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@ -2683,7 +2684,6 @@ static void cache_init_objs(struct kmem_cache *cachep,
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slab_bufctl(slabp)[i] = i + 1;
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}
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slab_bufctl(slabp)[i - 1] = BUFCTL_END;
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slabp->free = 0;
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}
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static void kmem_flagcheck(struct kmem_cache *cachep, gfp_t flags)
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@ -2816,7 +2816,6 @@ static int cache_grow(struct kmem_cache *cachep,
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if (!slabp)
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goto opps1;
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slabp->nodeid = nodeid;
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slab_map_pages(cachep, slabp, objp);
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cache_init_objs(cachep, slabp);
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94
mm/slub.c
94
mm/slub.c
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@ -211,6 +211,8 @@ static inline void ClearSlabDebug(struct page *page)
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/* Internal SLUB flags */
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#define __OBJECT_POISON 0x80000000 /* Poison object */
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#define __SYSFS_ADD_DEFERRED 0x40000000 /* Not yet visible via sysfs */
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#define __KMALLOC_CACHE 0x20000000 /* objects freed using kfree */
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#define __PAGE_ALLOC_FALLBACK 0x10000000 /* Allow fallback to page alloc */
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/* Not all arches define cache_line_size */
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#ifndef cache_line_size
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@ -308,7 +310,7 @@ static inline int is_end(void *addr)
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return (unsigned long)addr & PAGE_MAPPING_ANON;
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}
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void *slab_address(struct page *page)
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static void *slab_address(struct page *page)
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{
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return page->end - PAGE_MAPPING_ANON;
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}
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@ -1078,14 +1080,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
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struct page *page;
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int pages = 1 << s->order;
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if (s->order)
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flags |= __GFP_COMP;
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if (s->flags & SLAB_CACHE_DMA)
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flags |= SLUB_DMA;
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if (s->flags & SLAB_RECLAIM_ACCOUNT)
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flags |= __GFP_RECLAIMABLE;
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flags |= s->allocflags;
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if (node == -1)
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page = alloc_pages(flags, s->order);
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@ -1546,7 +1541,6 @@ load_freelist:
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unlock_out:
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slab_unlock(c->page);
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stat(c, ALLOC_SLOWPATH);
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out:
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#ifdef SLUB_FASTPATH
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local_irq_restore(flags);
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#endif
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@ -1581,8 +1575,24 @@ new_slab:
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c->page = new;
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goto load_freelist;
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}
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object = NULL;
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goto out;
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#ifdef SLUB_FASTPATH
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local_irq_restore(flags);
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#endif
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/*
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* No memory available.
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*
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* If the slab uses higher order allocs but the object is
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* smaller than a page size then we can fallback in emergencies
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* to the page allocator via kmalloc_large. The page allocator may
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* have failed to obtain a higher order page and we can try to
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* allocate a single page if the object fits into a single page.
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* That is only possible if certain conditions are met that are being
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* checked when a slab is created.
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*/
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if (!(gfpflags & __GFP_NORETRY) && (s->flags & __PAGE_ALLOC_FALLBACK))
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return kmalloc_large(s->objsize, gfpflags);
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return NULL;
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debug:
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object = c->page->freelist;
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if (!alloc_debug_processing(s, c->page, object, addr))
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@ -2329,10 +2339,33 @@ static int calculate_sizes(struct kmem_cache *s)
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size = ALIGN(size, align);
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s->size = size;
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s->order = calculate_order(size);
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if ((flags & __KMALLOC_CACHE) &&
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PAGE_SIZE / size < slub_min_objects) {
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/*
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* Kmalloc cache that would not have enough objects in
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* an order 0 page. Kmalloc slabs can fallback to
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* page allocator order 0 allocs so take a reasonably large
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* order that will allows us a good number of objects.
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*/
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s->order = max(slub_max_order, PAGE_ALLOC_COSTLY_ORDER);
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s->flags |= __PAGE_ALLOC_FALLBACK;
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s->allocflags |= __GFP_NOWARN;
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} else
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s->order = calculate_order(size);
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if (s->order < 0)
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return 0;
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s->allocflags = 0;
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if (s->order)
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s->allocflags |= __GFP_COMP;
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if (s->flags & SLAB_CACHE_DMA)
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s->allocflags |= SLUB_DMA;
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if (s->flags & SLAB_RECLAIM_ACCOUNT)
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s->allocflags |= __GFP_RECLAIMABLE;
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/*
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* Determine the number of objects per slab
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*/
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@ -2484,11 +2517,11 @@ EXPORT_SYMBOL(kmem_cache_destroy);
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* Kmalloc subsystem
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*******************************************************************/
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struct kmem_cache kmalloc_caches[PAGE_SHIFT] __cacheline_aligned;
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struct kmem_cache kmalloc_caches[PAGE_SHIFT + 1] __cacheline_aligned;
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EXPORT_SYMBOL(kmalloc_caches);
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#ifdef CONFIG_ZONE_DMA
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static struct kmem_cache *kmalloc_caches_dma[PAGE_SHIFT];
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static struct kmem_cache *kmalloc_caches_dma[PAGE_SHIFT + 1];
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#endif
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static int __init setup_slub_min_order(char *str)
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@ -2536,7 +2569,7 @@ static struct kmem_cache *create_kmalloc_cache(struct kmem_cache *s,
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down_write(&slub_lock);
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if (!kmem_cache_open(s, gfp_flags, name, size, ARCH_KMALLOC_MINALIGN,
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flags, NULL))
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flags | __KMALLOC_CACHE, NULL))
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goto panic;
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list_add(&s->list, &slab_caches);
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@ -2670,9 +2703,8 @@ void *__kmalloc(size_t size, gfp_t flags)
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{
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struct kmem_cache *s;
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if (unlikely(size > PAGE_SIZE / 2))
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return (void *)__get_free_pages(flags | __GFP_COMP,
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get_order(size));
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if (unlikely(size > PAGE_SIZE))
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return kmalloc_large(size, flags);
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s = get_slab(size, flags);
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@ -2688,9 +2720,8 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node)
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{
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struct kmem_cache *s;
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if (unlikely(size > PAGE_SIZE / 2))
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return (void *)__get_free_pages(flags | __GFP_COMP,
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get_order(size));
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if (unlikely(size > PAGE_SIZE))
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return kmalloc_large(size, flags);
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s = get_slab(size, flags);
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@ -3001,7 +3032,7 @@ void __init kmem_cache_init(void)
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caches++;
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}
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for (i = KMALLOC_SHIFT_LOW; i < PAGE_SHIFT; i++) {
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for (i = KMALLOC_SHIFT_LOW; i <= PAGE_SHIFT; i++) {
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create_kmalloc_cache(&kmalloc_caches[i],
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"kmalloc", 1 << i, GFP_KERNEL);
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caches++;
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@ -3028,7 +3059,7 @@ void __init kmem_cache_init(void)
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slab_state = UP;
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/* Provide the correct kmalloc names now that the caches are up */
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for (i = KMALLOC_SHIFT_LOW; i < PAGE_SHIFT; i++)
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for (i = KMALLOC_SHIFT_LOW; i <= PAGE_SHIFT; i++)
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kmalloc_caches[i]. name =
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kasprintf(GFP_KERNEL, "kmalloc-%d", 1 << i);
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@ -3057,6 +3088,9 @@ static int slab_unmergeable(struct kmem_cache *s)
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if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE))
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return 1;
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if ((s->flags & __PAGE_ALLOC_FALLBACK))
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return 1;
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if (s->ctor)
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return 1;
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@ -3218,9 +3252,9 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, void *caller)
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{
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struct kmem_cache *s;
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if (unlikely(size > PAGE_SIZE / 2))
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return (void *)__get_free_pages(gfpflags | __GFP_COMP,
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get_order(size));
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if (unlikely(size > PAGE_SIZE))
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return kmalloc_large(size, gfpflags);
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s = get_slab(size, gfpflags);
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if (unlikely(ZERO_OR_NULL_PTR(s)))
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@ -3234,9 +3268,9 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
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{
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struct kmem_cache *s;
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if (unlikely(size > PAGE_SIZE / 2))
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return (void *)__get_free_pages(gfpflags | __GFP_COMP,
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get_order(size));
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if (unlikely(size > PAGE_SIZE))
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return kmalloc_large(size, gfpflags);
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s = get_slab(size, gfpflags);
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if (unlikely(ZERO_OR_NULL_PTR(s)))
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