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slub: Extract hooks for memory checkers from hotpaths

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Extract the code that memory checkers and other verification tools use from
the hotpaths. Makes it easier to add new ones and reduces the disturbances
of the hotpaths.

Signed-off-by: Christoph Lameter <cl@linux-foundation.org>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Christoph Lameter 2010-08-20 12:37:16 -05:00 committed by Pekka Enberg
parent 51df114281
commit c016b0bdee
1 changed files with 38 additions and 11 deletions
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49
mm/slub.c
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@ -790,6 +790,37 @@ static void trace(struct kmem_cache *s, struct page *page, void *object,
}
}
/*
* Hooks for other subsystems that check memory allocations. In a typical
* production configuration these hooks all should produce no code at all.
*/
static inline int slab_pre_alloc_hook(struct kmem_cache *s, gfp_t flags)
{
lockdep_trace_alloc(flags);
might_sleep_if(flags & __GFP_WAIT);
return should_failslab(s->objsize, flags, s->flags);
}
static inline void slab_post_alloc_hook(struct kmem_cache *s, gfp_t flags, void *object)
{
kmemcheck_slab_alloc(s, flags, object, s->objsize);
kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, flags);
}
static inline void slab_free_hook(struct kmem_cache *s, void *x)
{
kmemleak_free_recursive(x, s->flags);
}
static inline void slab_free_hook_irq(struct kmem_cache *s, void *object)
{
kmemcheck_slab_free(s, object, s->objsize);
debug_check_no_locks_freed(object, s->objsize);
if (!(s->flags & SLAB_DEBUG_OBJECTS))
debug_check_no_obj_freed(object, s->objsize);
}
/*
* Tracking of fully allocated slabs for debugging purposes.
*/
@ -1696,10 +1727,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
gfpflags &= gfp_allowed_mask;
lockdep_trace_alloc(gfpflags);
might_sleep_if(gfpflags & __GFP_WAIT);
if (should_failslab(s->objsize, gfpflags, s->flags))
if (slab_pre_alloc_hook(s, gfpflags))
return NULL;
local_irq_save(flags);
@ -1718,8 +1746,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
if (unlikely(gfpflags & __GFP_ZERO) && object)
memset(object, 0, s->objsize);
kmemcheck_slab_alloc(s, gfpflags, object, s->objsize);
kmemleak_alloc_recursive(object, s->objsize, 1, s->flags, gfpflags);
slab_post_alloc_hook(s, gfpflags, object);
return object;
}
@ -1849,13 +1876,13 @@ static __always_inline void slab_free(struct kmem_cache *s,
struct kmem_cache_cpu *c;
unsigned long flags;
kmemleak_free_recursive(x, s->flags);
slab_free_hook(s, x);
local_irq_save(flags);
c = __this_cpu_ptr(s->cpu_slab);
kmemcheck_slab_free(s, object, s->objsize);
debug_check_no_locks_freed(object, s->objsize);
if (!(s->flags & SLAB_DEBUG_OBJECTS))
debug_check_no_obj_freed(object, s->objsize);
slab_free_hook_irq(s, x);
if (likely(page == c->page && c->node >= 0)) {
set_freepointer(s, object, c->freelist);
c->freelist = object;