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slub: Eliminate repeated use of c->page through a new page variable 

__slab_alloc is full of "c->page" repeats. Lets just use one local variable
named "page" for this. Also avoids the need to a have another variable
called "new".

Signed-off-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2011-04-15 14:48:14 -05:00 committed by Pekka Enberg
parent 5f80b13ae4
commit 01ad8a7bc2
1 changed files with 22 additions and 19 deletions
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41
mm/slub.c
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@ -1790,7 +1790,7 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
unsigned long addr, struct kmem_cache_cpu *c) unsigned long addr, struct kmem_cache_cpu *c)
{ {
void **object; void **object;
struct page *new; struct page *page;
#ifdef CONFIG_CMPXCHG_LOCAL #ifdef CONFIG_CMPXCHG_LOCAL
unsigned long flags; unsigned long flags;
@ -1808,28 +1808,30 @@ static void *__slab_alloc(struct kmem_cache *s, gfp_t gfpflags, int node,
/* We handle __GFP_ZERO in the caller */ /* We handle __GFP_ZERO in the caller */
gfpflags &= ~__GFP_ZERO; gfpflags &= ~__GFP_ZERO;
if (!c->page) page = c->page;
if (!page)
goto new_slab; goto new_slab;
slab_lock(c->page); slab_lock(page);
if (unlikely(!node_match(c, node))) if (unlikely(!node_match(c, node)))
goto another_slab; goto another_slab;
stat(s, ALLOC_REFILL); stat(s, ALLOC_REFILL);
load_freelist: load_freelist:
object = c->page->freelist; object = page->freelist;
if (unlikely(!object)) if (unlikely(!object))
goto another_slab; goto another_slab;
if (kmem_cache_debug(s)) if (kmem_cache_debug(s))
goto debug; goto debug;
c->freelist = get_freepointer(s, object); c->freelist = get_freepointer(s, object);
c->page->inuse = c->page->objects; page->inuse = page->objects;
c->page->freelist = NULL; page->freelist = NULL;
c->node = page_to_nid(c->page); c->node = page_to_nid(page);
unlock_out: unlock_out:
slab_unlock(c->page); slab_unlock(page);
#ifdef CONFIG_CMPXCHG_LOCAL #ifdef CONFIG_CMPXCHG_LOCAL
c->tid = next_tid(c->tid); c->tid = next_tid(c->tid);
local_irq_restore(flags); local_irq_restore(flags);
@ -1841,9 +1843,9 @@ another_slab:
deactivate_slab(s, c); deactivate_slab(s, c);
new_slab: new_slab:
new = get_partial(s, gfpflags, node); page = get_partial(s, gfpflags, node);
if (new) { if (page) {
c->page = new; c->page = page;
stat(s, ALLOC_FROM_PARTIAL); stat(s, ALLOC_FROM_PARTIAL);
goto load_freelist; goto load_freelist;
} }
@ -1852,19 +1854,20 @@ new_slab:
if (gfpflags & __GFP_WAIT) if (gfpflags & __GFP_WAIT)
local_irq_enable(); local_irq_enable();
new = new_slab(s, gfpflags, node); page = new_slab(s, gfpflags, node);
if (gfpflags & __GFP_WAIT) if (gfpflags & __GFP_WAIT)
local_irq_disable(); local_irq_disable();
if (new) { if (page) {
c = __this_cpu_ptr(s->cpu_slab); c = __this_cpu_ptr(s->cpu_slab);
stat(s, ALLOC_SLAB); stat(s, ALLOC_SLAB);
if (c->page) if (c->page)
flush_slab(s, c); flush_slab(s, c);
slab_lock(new);
__SetPageSlubFrozen(new); slab_lock(page);
c->page = new; __SetPageSlubFrozen(page);
c->page = page;
goto load_freelist; goto load_freelist;
} }
if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit()) if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())
@ -1874,11 +1877,11 @@ new_slab:
#endif #endif
return NULL; return NULL;
debug: debug:
if (!alloc_debug_processing(s, c->page, object, addr)) if (!alloc_debug_processing(s, page, object, addr))
goto another_slab; goto another_slab;
c->page->inuse++; page->inuse++;
c->page->freelist = get_freepointer(s, object); page->freelist = get_freepointer(s, object);
c->node = NUMA_NO_NODE; c->node = NUMA_NO_NODE;
goto unlock_out; goto unlock_out;
} }