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SLUB: Simplify debug code
Consolidate functionality into the #ifdef section. Extract tracing into one subroutine. Move object debug processing into the #ifdef section so that the code in __slab_alloc and __slab_free becomes minimal. Reduce number of functions we need to provide stubs for in the !SLUB_DEBUG case. Signed-off-by: Christoph Lameter <clameter@sgi.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Lameter
Linus Torvalds
parent
a35afb830f
commit
3ec0974210
112
mm/slub.c
112
mm/slub.c
@ -742,6 +742,22 @@ static int on_freelist(struct kmem_cache *s, struct page *page, void *search)
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return search == NULL;
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}
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static void trace(struct kmem_cache *s, struct page *page, void *object, int alloc)
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{
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if (s->flags & SLAB_TRACE) {
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printk(KERN_INFO "TRACE %s %s 0x%p inuse=%d fp=0x%p\n",
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s->name,
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alloc ? "alloc" : "free",
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object, page->inuse,
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page->freelist);
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if (!alloc)
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print_section("Object", (void *)object, s->objsize);
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dump_stack();
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}
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}
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/*
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* Tracking of fully allocated slabs for debugging purposes.
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*/
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@ -766,8 +782,18 @@ static void remove_full(struct kmem_cache *s, struct page *page)
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spin_unlock(&n->list_lock);
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}
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static int alloc_object_checks(struct kmem_cache *s, struct page *page,
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void *object)
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static void setup_object_debug(struct kmem_cache *s, struct page *page,
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void *object)
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{
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if (!(s->flags & (SLAB_STORE_USER|SLAB_RED_ZONE|__OBJECT_POISON)))
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return;
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init_object(s, object, 0);
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init_tracking(s, object);
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}
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static int alloc_debug_processing(struct kmem_cache *s, struct page *page,
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void *object, void *addr)
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{
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if (!check_slab(s, page))
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goto bad;
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@ -782,13 +808,16 @@ static int alloc_object_checks(struct kmem_cache *s, struct page *page,
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goto bad;
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}
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if (!object)
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return 1;
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if (!check_object(s, page, object, 0))
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if (object && !check_object(s, page, object, 0))
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goto bad;
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/* Success perform special debug activities for allocs */
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if (s->flags & SLAB_STORE_USER)
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set_track(s, object, TRACK_ALLOC, addr);
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trace(s, page, object, 1);
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init_object(s, object, 1);
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return 1;
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bad:
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if (PageSlab(page)) {
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/*
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@ -806,8 +835,8 @@ bad:
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return 0;
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}
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static int free_object_checks(struct kmem_cache *s, struct page *page,
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void *object)
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static int free_debug_processing(struct kmem_cache *s, struct page *page,
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void *object, void *addr)
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{
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if (!check_slab(s, page))
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goto fail;
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@ -841,29 +870,22 @@ static int free_object_checks(struct kmem_cache *s, struct page *page,
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"to slab %s", object, page->slab->name);
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goto fail;
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}
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/* Special debug activities for freeing objects */
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if (!SlabFrozen(page) && !page->freelist)
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remove_full(s, page);
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if (s->flags & SLAB_STORE_USER)
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set_track(s, object, TRACK_FREE, addr);
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trace(s, page, object, 0);
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init_object(s, object, 0);
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return 1;
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fail:
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printk(KERN_ERR "@@@ SLUB: %s slab 0x%p object at 0x%p not freed.\n",
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s->name, page, object);
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return 0;
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}
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static void trace(struct kmem_cache *s, struct page *page, void *object, int alloc)
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{
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if (s->flags & SLAB_TRACE) {
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printk(KERN_INFO "TRACE %s %s 0x%p inuse=%d fp=0x%p\n",
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s->name,
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alloc ? "alloc" : "free",
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object, page->inuse,
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page->freelist);
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if (!alloc)
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print_section("Object", (void *)object, s->objsize);
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dump_stack();
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}
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}
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static int __init setup_slub_debug(char *str)
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{
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if (!str || *str != '=')
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@ -932,26 +954,20 @@ static void kmem_cache_open_debug_check(struct kmem_cache *s)
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s->flags |= slub_debug;
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}
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#else
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static inline void setup_object_debug(struct kmem_cache *s,
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struct page *page, void *object) {}
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static inline int alloc_object_checks(struct kmem_cache *s,
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struct page *page, void *object) { return 0; }
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static inline int alloc_debug_processing(struct kmem_cache *s,
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struct page *page, void *object, void *addr) { return 0; }
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static inline int free_object_checks(struct kmem_cache *s,
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struct page *page, void *object) { return 0; }
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static inline int free_debug_processing(struct kmem_cache *s,
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struct page *page, void *object, void *addr) { return 0; }
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static inline void add_full(struct kmem_cache_node *n, struct page *page) {}
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static inline void remove_full(struct kmem_cache *s, struct page *page) {}
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static inline void trace(struct kmem_cache *s, struct page *page,
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void *object, int alloc) {}
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static inline void init_object(struct kmem_cache *s,
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void *object, int active) {}
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static inline void init_tracking(struct kmem_cache *s, void *object) {}
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static inline int slab_pad_check(struct kmem_cache *s, struct page *page)
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{ return 1; }
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static inline int check_object(struct kmem_cache *s, struct page *page,
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void *object, int active) { return 1; }
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static inline void set_track(struct kmem_cache *s, void *object,
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enum track_item alloc, void *addr) {}
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static inline void add_full(struct kmem_cache_node *n, struct page *page) {}
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static inline void kmem_cache_open_debug_check(struct kmem_cache *s) {}
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#define slub_debug 0
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#endif
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@ -988,11 +1004,7 @@ static struct page *allocate_slab(struct kmem_cache *s, gfp_t flags, int node)
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static void setup_object(struct kmem_cache *s, struct page *page,
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void *object)
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{
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if (SlabDebug(page)) {
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init_object(s, object, 0);
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init_tracking(s, object);
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}
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setup_object_debug(s, page, object);
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if (unlikely(s->ctor))
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s->ctor(object, s, 0);
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}
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@ -1449,12 +1461,8 @@ new_slab:
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return NULL;
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debug:
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object = page->freelist;
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if (!alloc_object_checks(s, page, object))
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if (!alloc_debug_processing(s, page, object, addr))
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goto another_slab;
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if (s->flags & SLAB_STORE_USER)
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set_track(s, object, TRACK_ALLOC, addr);
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trace(s, page, object, 1);
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init_object(s, object, 1);
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page->inuse++;
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page->freelist = object[page->offset];
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@ -1561,14 +1569,8 @@ slab_empty:
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return;
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debug:
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if (!free_object_checks(s, page, x))
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if (!free_debug_processing(s, page, x, addr))
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goto out_unlock;
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if (!SlabFrozen(page) && !page->freelist)
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remove_full(s, page);
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if (s->flags & SLAB_STORE_USER)
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set_track(s, x, TRACK_FREE, addr);
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trace(s, page, object, 0);
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init_object(s, object, 0);
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goto checks_ok;
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}
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@ -1805,7 +1807,7 @@ static struct kmem_cache_node * __init early_kmem_cache_node_alloc(gfp_t gfpflag
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page->freelist = get_freepointer(kmalloc_caches, n);
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page->inuse++;
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kmalloc_caches->node[node] = n;
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init_object(kmalloc_caches, n, 1);
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setup_object_debug(kmalloc_caches, page, n);
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init_kmem_cache_node(n);
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atomic_long_inc(&n->nr_slabs);
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add_partial(n, page);
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