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kmemtrace: SLUB hooks.
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This adds hooks for the SLUB allocator, to allow tracing with kmemtrace.

Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
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Eduard - Gabriel Munteanu authored and Pekka Enberg committed Dec 29, 2008
1 parent 3eae2cb commit 5b882be
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Showing 2 changed files with 109 additions and 9 deletions.
53 changes: 50 additions & 3 deletions include/linux/slub_def.h
View file
Original file line number Diff line number Diff line change
Expand Up @@ -10,6 +10,7 @@
#include <linux/gfp.h>
#include <linux/workqueue.h>
#include <linux/kobject.h>
#include <linux/kmemtrace.h>

enum stat_item {
ALLOC_FASTPATH, /* Allocation from cpu slab */
Expand Down Expand Up @@ -204,13 +205,31 @@ static __always_inline struct kmem_cache *kmalloc_slab(size_t size)
void *kmem_cache_alloc(struct kmem_cache *, gfp_t);
void *__kmalloc(size_t size, gfp_t flags);

#ifdef CONFIG_KMEMTRACE
extern void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags);
#else
static __always_inline void *
kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
{
return kmem_cache_alloc(s, gfpflags);
}
#endif

static __always_inline void *kmalloc_large(size_t size, gfp_t flags)
{
return (void *)__get_free_pages(flags | __GFP_COMP, get_order(size));
unsigned int order = get_order(size);
void *ret = (void *) __get_free_pages(flags | __GFP_COMP, order);

kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, _THIS_IP_, ret,
size, PAGE_SIZE << order, flags);

return ret;
}

static __always_inline void *kmalloc(size_t size, gfp_t flags)
{
void *ret;

if (__builtin_constant_p(size)) {
if (size > PAGE_SIZE)
return kmalloc_large(size, flags);
Expand All @@ -221,7 +240,13 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
if (!s)
return ZERO_SIZE_PTR;

return kmem_cache_alloc(s, flags);
ret = kmem_cache_alloc_notrace(s, flags);

kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC,
_THIS_IP_, ret,
size, s->size, flags);

return ret;
}
}
return __kmalloc(size, flags);
Expand All @@ -231,16 +256,38 @@ static __always_inline void *kmalloc(size_t size, gfp_t flags)
void *__kmalloc_node(size_t size, gfp_t flags, int node);
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);

#ifdef CONFIG_KMEMTRACE
extern void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
gfp_t gfpflags,
int node);
#else
static __always_inline void *
kmem_cache_alloc_node_notrace(struct kmem_cache *s,
gfp_t gfpflags,
int node)
{
return kmem_cache_alloc_node(s, gfpflags, node);
}
#endif

static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
void *ret;

if (__builtin_constant_p(size) &&
size <= PAGE_SIZE && !(flags & SLUB_DMA)) {
struct kmem_cache *s = kmalloc_slab(size);

if (!s)
return ZERO_SIZE_PTR;

return kmem_cache_alloc_node(s, flags, node);
ret = kmem_cache_alloc_node_notrace(s, flags, node);

kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC,
_THIS_IP_, ret,
size, s->size, flags, node);

return ret;
}
return __kmalloc_node(size, flags, node);
}
Expand Down
65 changes: 59 additions & 6 deletions mm/slub.c
View file
Original file line number Diff line number Diff line change
Expand Up @@ -24,6 +24,7 @@
#include <linux/kallsyms.h>
#include <linux/memory.h>
#include <linux/math64.h>
#include <linux/kmemtrace.h>

/*
* Lock order:
Expand Down Expand Up @@ -1613,18 +1614,46 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,

void *kmem_cache_alloc(struct kmem_cache *s, gfp_t gfpflags)
{
return slab_alloc(s, gfpflags, -1, _RET_IP_);
void *ret = slab_alloc(s, gfpflags, -1, _RET_IP_);

kmemtrace_mark_alloc(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret,
s->objsize, s->size, gfpflags);

return ret;
}
EXPORT_SYMBOL(kmem_cache_alloc);

#ifdef CONFIG_KMEMTRACE
void *kmem_cache_alloc_notrace(struct kmem_cache *s, gfp_t gfpflags)
{
return slab_alloc(s, gfpflags, -1, _RET_IP_);
}
EXPORT_SYMBOL(kmem_cache_alloc_notrace);
#endif

#ifdef CONFIG_NUMA
void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
{
return slab_alloc(s, gfpflags, node, _RET_IP_);
void *ret = slab_alloc(s, gfpflags, node, _RET_IP_);

kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret,
s->objsize, s->size, gfpflags, node);

return ret;
}
EXPORT_SYMBOL(kmem_cache_alloc_node);
#endif

#ifdef CONFIG_KMEMTRACE
void *kmem_cache_alloc_node_notrace(struct kmem_cache *s,
gfp_t gfpflags,
int node)
{
return slab_alloc(s, gfpflags, node, _RET_IP_);
}
EXPORT_SYMBOL(kmem_cache_alloc_node_notrace);
#endif

/*
* Slow patch handling. This may still be called frequently since objects
* have a longer lifetime than the cpu slabs in most processing loads.
Expand Down Expand Up @@ -1732,6 +1761,8 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
page = virt_to_head_page(x);

slab_free(s, page, x, _RET_IP_);

kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, x);
}
EXPORT_SYMBOL(kmem_cache_free);

Expand Down Expand Up @@ -2650,6 +2681,7 @@ static struct kmem_cache *get_slab(size_t size, gfp_t flags)
void *__kmalloc(size_t size, gfp_t flags)
{
struct kmem_cache *s;
void *ret;

if (unlikely(size > PAGE_SIZE))
return kmalloc_large(size, flags);
Expand All @@ -2659,7 +2691,12 @@ void *__kmalloc(size_t size, gfp_t flags)
if (unlikely(ZERO_OR_NULL_PTR(s)))
return s;

return slab_alloc(s, flags, -1, _RET_IP_);
ret = slab_alloc(s, flags, -1, _RET_IP_);

kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, ret,
size, s->size, flags);

return ret;
}
EXPORT_SYMBOL(__kmalloc);

Expand All @@ -2678,16 +2715,30 @@ static void *kmalloc_large_node(size_t size, gfp_t flags, int node)
void *__kmalloc_node(size_t size, gfp_t flags, int node)
{
struct kmem_cache *s;
void *ret;

if (unlikely(size > PAGE_SIZE))
return kmalloc_large_node(size, flags, node);
if (unlikely(size > PAGE_SIZE)) {
ret = kmalloc_large_node(size, flags, node);

kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC,
_RET_IP_, ret,
size, PAGE_SIZE << get_order(size),
flags, node);

return ret;
}

s = get_slab(size, flags);

if (unlikely(ZERO_OR_NULL_PTR(s)))
return s;

return slab_alloc(s, flags, node, _RET_IP_);
ret = slab_alloc(s, flags, node, _RET_IP_);

kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, ret,
size, s->size, flags, node);

return ret;
}
EXPORT_SYMBOL(__kmalloc_node);
#endif
Expand Down Expand Up @@ -2745,6 +2796,8 @@ void kfree(const void *x)
return;
}
slab_free(page->slab, page, object, _RET_IP_);

kmemtrace_mark_free(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, x);
}
EXPORT_SYMBOL(kfree);

Expand Down

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