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[PATCH] leak tracking for kmalloc_node
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We have variants of kmalloc and kmem_cache_alloc that leave leak tracking to
the caller.  This is used for subsystem-specific allocators like skb_alloc.

To make skb_alloc node-aware we need similar routines for the node-aware slab
allocator, which this patch adds.

Note that the code is rather ugly, but it mirrors the non-node-aware code 1:1:

[akpm@osdl.org: add module export]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
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Christoph Hellwig authored and Linus Torvalds committed Dec 7, 2006
1 parent 881e4aa commit 8b98c16
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Showing 2 changed files with 65 additions and 13 deletions.
23 changes: 23 additions & 0 deletions include/linux/slab.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -236,7 +236,25 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
}
return __kmalloc_node(size, flags, node);
}

/*
* kmalloc_node_track_caller is a special version of kmalloc_node that
* records the calling function of the routine calling it for slab leak
* tracking instead of just the calling function (confusing, eh?).
* It's useful when the call to kmalloc_node comes from a widely-used
* standard allocator where we care about the real place the memory
* allocation request comes from.
*/
#ifndef CONFIG_DEBUG_SLAB
#define kmalloc_node_track_caller(size, flags, node) \
__kmalloc_node(size, flags, node)
#else
extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, void *);
#define kmalloc_node_track_caller(size, flags, node) \
__kmalloc_node_track_caller(size, flags, node, \
__builtin_return_address(0))
#endif
#else /* CONFIG_NUMA */
static inline void *kmem_cache_alloc_node(kmem_cache_t *cachep, gfp_t flags, int node)
{
return kmem_cache_alloc(cachep, flags);
Expand All @@ -245,6 +263,9 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
return kmalloc(size, flags);
}

#define kmalloc_node_track_caller(size, flags, node) \
kmalloc_track_caller(size, flags)
#endif

extern int FASTCALL(kmem_cache_reap(int));
Expand Down Expand Up @@ -283,6 +304,8 @@ static inline void *kcalloc(size_t n, size_t size, gfp_t flags)
#define kzalloc(s, f) __kzalloc(s, f)
#define kmalloc_track_caller kmalloc

#define kmalloc_node_track_caller kmalloc_node

#endif /* CONFIG_SLOB */

/* System wide caches */
Expand Down
55 changes: 42 additions & 13 deletions mm/slab.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -1015,15 +1015,15 @@ static inline void *alternate_node_alloc(struct kmem_cache *cachep,
return NULL;
}

static inline void *__cache_alloc_node(struct kmem_cache *cachep,
static inline void *____cache_alloc_node(struct kmem_cache *cachep,
gfp_t flags, int nodeid)
{
return NULL;
}

#else /* CONFIG_NUMA */

static void *__cache_alloc_node(struct kmem_cache *, gfp_t, int);
static void *____cache_alloc_node(struct kmem_cache *, gfp_t, int);
static void *alternate_node_alloc(struct kmem_cache *, gfp_t);

static struct array_cache **alloc_alien_cache(int node, int limit)
Expand Down Expand Up @@ -3130,10 +3130,10 @@ static __always_inline void *__cache_alloc(struct kmem_cache *cachep,
objp = ____cache_alloc(cachep, flags);
/*
* We may just have run out of memory on the local node.
* __cache_alloc_node() knows how to locate memory on other nodes
* ____cache_alloc_node() knows how to locate memory on other nodes
*/
if (NUMA_BUILD && !objp)
objp = __cache_alloc_node(cachep, flags, numa_node_id());
objp = ____cache_alloc_node(cachep, flags, numa_node_id());
local_irq_restore(save_flags);
objp = cache_alloc_debugcheck_after(cachep, flags, objp,
caller);
Expand All @@ -3160,7 +3160,7 @@ static void *alternate_node_alloc(struct kmem_cache *cachep, gfp_t flags)
else if (current->mempolicy)
nid_alloc = slab_node(current->mempolicy);
if (nid_alloc != nid_here)
return __cache_alloc_node(cachep, flags, nid_alloc);
return ____cache_alloc_node(cachep, flags, nid_alloc);
return NULL;
}

Expand All @@ -3183,7 +3183,7 @@ void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
if (zone_idx(*z) <= ZONE_NORMAL &&
cpuset_zone_allowed(*z, flags) &&
cache->nodelists[nid])
obj = __cache_alloc_node(cache,
obj = ____cache_alloc_node(cache,
flags | __GFP_THISNODE, nid);
}
return obj;
Expand All @@ -3192,7 +3192,7 @@ void *fallback_alloc(struct kmem_cache *cache, gfp_t flags)
/*
* A interface to enable slab creation on nodeid
*/
static void *__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
static void *____cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
int nodeid)
{
struct list_head *entry;
Expand Down Expand Up @@ -3465,7 +3465,9 @@ int fastcall kmem_ptr_validate(struct kmem_cache *cachep, void *ptr)
* New and improved: it will now make sure that the object gets
* put on the correct node list so that there is no false sharing.
*/
void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
static __always_inline void *
__cache_alloc_node(struct kmem_cache *cachep, gfp_t flags,
int nodeid, void *caller)
{
unsigned long save_flags;
void *ptr;
Expand All @@ -3477,17 +3479,23 @@ void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
!cachep->nodelists[nodeid])
ptr = ____cache_alloc(cachep, flags);
else
ptr = __cache_alloc_node(cachep, flags, nodeid);
ptr = ____cache_alloc_node(cachep, flags, nodeid);
local_irq_restore(save_flags);

ptr = cache_alloc_debugcheck_after(cachep, flags, ptr,
__builtin_return_address(0));
ptr = cache_alloc_debugcheck_after(cachep, flags, ptr, caller);

return ptr;
}

void *kmem_cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid)
{
return __cache_alloc_node(cachep, flags, nodeid,
__builtin_return_address(0));
}
EXPORT_SYMBOL(kmem_cache_alloc_node);

void *__kmalloc_node(size_t size, gfp_t flags, int node)
static __always_inline void *
__do_kmalloc_node(size_t size, gfp_t flags, int node, void *caller)
{
struct kmem_cache *cachep;

Expand All @@ -3496,8 +3504,29 @@ void *__kmalloc_node(size_t size, gfp_t flags, int node)
return NULL;
return kmem_cache_alloc_node(cachep, flags, node);
}

#ifdef CONFIG_DEBUG_SLAB
void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
return __do_kmalloc_node(size, flags, node,
__builtin_return_address(0));
}
EXPORT_SYMBOL(__kmalloc_node);
#endif

void *__kmalloc_node_track_caller(size_t size, gfp_t flags,
int node, void *caller)
{
return __do_kmalloc_node(size, flags, node, caller);
}
EXPORT_SYMBOL(__kmalloc_node_track_caller);
#else
void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
return __do_kmalloc_node(size, flags, node, NULL);
}
EXPORT_SYMBOL(__kmalloc_node);
#endif /* CONFIG_DEBUG_SLAB */
#endif /* CONFIG_NUMA */

/**
* __do_kmalloc - allocate memory
Expand Down

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