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slub: Drop fallback to page allocator method 

There is now a generic method of falling back to a slab page of minimal
order. No need anymore for the fallback to kmalloc_large().

Signed-off-by: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Christoph Lameter 2008-04-14 19:11:41 +03:00 committed by Pekka Enberg
parent 65c3376aac
commit 319d1e2406
1 changed files with 2 additions and 41 deletions
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43
mm/slub.c
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@ -204,8 +204,6 @@ static inline void ClearSlabDebug(struct page *page)
/* Internal SLUB flags */
#define __OBJECT_POISON 0x80000000 /* Poison object */
#define __SYSFS_ADD_DEFERRED 0x40000000 /* Not yet visible via sysfs */
#define __KMALLOC_CACHE 0x20000000 /* objects freed using kfree */
#define __PAGE_ALLOC_FALLBACK 0x10000000 /* Allow fallback to page alloc */
/* Not all arches define cache_line_size */
#ifndef cache_line_size
@ -1623,27 +1621,6 @@ new_slab:
c->page = new;
goto load_freelist;
}
/*
* No memory available.
*
* If the slab uses higher order allocs but the object is
* smaller than a page size then we can fallback in emergencies
* to the page allocator via kmalloc_large. The page allocator may
* have failed to obtain a higher order page and we can try to
* allocate a single page if the object fits into a single page.
* That is only possible if certain conditions are met that are being
* checked when a slab is created.
*/
if (!(gfpflags & __GFP_NORETRY) &&
(s->flags & __PAGE_ALLOC_FALLBACK)) {
if (gfpflags & __GFP_WAIT)
local_irq_enable();
object = kmalloc_large(s->objsize, gfpflags);
if (gfpflags & __GFP_WAIT)
local_irq_disable();
return object;
}
return NULL;
debug:
if (!alloc_debug_processing(s, c->page, object, addr))
@ -2330,20 +2307,7 @@ static int calculate_sizes(struct kmem_cache *s)
*/
size = ALIGN(size, align);
s->size = size;
if ((flags & __KMALLOC_CACHE) &&
PAGE_SIZE / size < slub_min_objects) {
/*
* Kmalloc cache that would not have enough objects in
* an order 0 page. Kmalloc slabs can fallback to
* page allocator order 0 allocs so take a reasonably large
* order that will allows us a good number of objects.
*/
order = max(slub_max_order, PAGE_ALLOC_COSTLY_ORDER);
s->flags |= __PAGE_ALLOC_FALLBACK;
s->allocflags |= __GFP_NOWARN;
} else
order = calculate_order(size);
order = calculate_order(size);
if (order < 0)
return 0;
@ -2589,7 +2553,7 @@ static struct kmem_cache *create_kmalloc_cache(struct kmem_cache *s,
down_write(&slub_lock);
if (!kmem_cache_open(s, gfp_flags, name, size, ARCH_KMALLOC_MINALIGN,
flags | __KMALLOC_CACHE, NULL))
flags, NULL))
goto panic;
list_add(&s->list, &slab_caches);
@ -3105,9 +3069,6 @@ static int slab_unmergeable(struct kmem_cache *s)
if (slub_nomerge || (s->flags & SLUB_NEVER_MERGE))
return 1;
if ((s->flags & __PAGE_ALLOC_FALLBACK))
return 1;
if (s->ctor)
return 1;