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mm, slob: Add support for kmalloc_track_caller() 

Currently slob falls back to regular kmalloc for this case.
With this patch kmalloc_track_caller() is correctly implemented,
thus tracing the specified caller.

This is important to trace accurately allocations performed by
krealloc, kstrdup, kmemdup, etc.

Signed-off-by: Ezequiel Garcia <elezegarcia@gmail.com>
Signed-off-by: Pekka Enberg <penberg@kernel.org>
This commit is contained in:
Ezequiel Garcia 2012-09-08 17:47:53 -03:00 committed by Pekka Enberg
parent ff4fcd01ec
commit f3f7410195
2 changed files with 28 additions and 5 deletions
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6
include/linux/slab.h
View File

@ -321,7 +321,8 @@ static inline void *kmem_cache_alloc_node(struct kmem_cache *cachep,
* request comes from.
*/
#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
(defined(CONFIG_SLAB) && defined(CONFIG_TRACING))
(defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \
(defined(CONFIG_SLOB) && defined(CONFIG_TRACING))
extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
#define kmalloc_track_caller(size, flags) \
__kmalloc_track_caller(size, flags, _RET_IP_)
@ -340,7 +341,8 @@ extern void *__kmalloc_track_caller(size_t, gfp_t, unsigned long);
* allocation request comes from.
*/
#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB) || \
(defined(CONFIG_SLAB) && defined(CONFIG_TRACING))
(defined(CONFIG_SLAB) && defined(CONFIG_TRACING)) || \
(defined(CONFIG_SLOB) && defined(CONFIG_TRACING))
extern void *__kmalloc_node_track_caller(size_t, gfp_t, int, unsigned long);
#define kmalloc_node_track_caller(size, flags, node) \
__kmalloc_node_track_caller(size, flags, node, \

27
mm/slob.c
View File

@ -425,7 +425,8 @@ out:
* End of slob allocator proper. Begin kmem_cache_alloc and kmalloc frontend.
*/
void *__kmalloc_node(size_t size, gfp_t gfp, int node)
static __always_inline void *
__do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller)
{
unsigned int *m;
int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
@ -446,7 +447,7 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
*m = size;
ret = (void *)m + align;
trace_kmalloc_node(_RET_IP_, ret,
trace_kmalloc_node(caller, ret,
size, size + align, gfp, node);
} else {
unsigned int order = get_order(size);
@ -460,15 +461,35 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
page->private = size;
}
trace_kmalloc_node(_RET_IP_, ret,
trace_kmalloc_node(caller, ret,
size, PAGE_SIZE << order, gfp, node);
}
kmemleak_alloc(ret, size, 1, gfp);
return ret;
}
void *__kmalloc_node(size_t size, gfp_t gfp, int node)
{
return __do_kmalloc_node(size, gfp, node, _RET_IP_);
}
EXPORT_SYMBOL(__kmalloc_node);
#ifdef CONFIG_TRACING
void *__kmalloc_track_caller(size_t size, gfp_t gfp, unsigned long caller)
{
return __do_kmalloc_node(size, gfp, NUMA_NO_NODE, caller);
}
#ifdef CONFIG_NUMA
void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
int node, unsigned long caller)
{
return __do_kmalloc_node(size, gfp, node, caller);
}
#endif
#endif
void kfree(const void *block)
{
struct page *sp;