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kmemtrace: SLOB hooks. 

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

We also convert some inline functions to __always_inline to make sure
_RET_IP_, which expands to __builtin_return_address(0), always works
as expected.

Acked-by: Matt Mackall <mpm@selenic.com>
Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
This commit is contained in:
Eduard - Gabriel Munteanu 2008-08-10 20:14:07 +03:00 committed by Pekka Enberg
parent 36555751c6
commit 3eae2cb24a
2 changed files with 37 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

9
include/linux/slob_def.h
View File

@ -3,14 +3,15 @@
void *kmem_cache_alloc_node(struct kmem_cache *, gfp_t flags, int node);
static inline void *kmem_cache_alloc(struct kmem_cache *cachep, gfp_t flags)
static __always_inline void *kmem_cache_alloc(struct kmem_cache *cachep,
gfp_t flags)
{
return kmem_cache_alloc_node(cachep, flags, -1);
}
void *__kmalloc_node(size_t size, gfp_t flags, int node);
static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node)
{
return __kmalloc_node(size, flags, node);
}
@ -23,12 +24,12 @@ static inline void *kmalloc_node(size_t size, gfp_t flags, int node)
* kmalloc is the normal method of allocating memory
* in the kernel.
*/
static inline void *kmalloc(size_t size, gfp_t flags)
static __always_inline void *kmalloc(size_t size, gfp_t flags)
{
return __kmalloc_node(size, flags, -1);
}
static inline void *__kmalloc(size_t size, gfp_t flags)
static __always_inline void *__kmalloc(size_t size, gfp_t flags)
{
return kmalloc(size, flags);
}

39
mm/slob.c
View File

@ -65,6 +65,7 @@
#include <linux/module.h>
#include <linux/rcupdate.h>
#include <linux/list.h>
#include <linux/kmemtrace.h>
#include <asm/atomic.h>
/*
@ -463,27 +464,38 @@ void *__kmalloc_node(size_t size, gfp_t gfp, int node)
{
unsigned int *m;
int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
void *ret;
if (size < PAGE_SIZE - align) {
if (!size)
return ZERO_SIZE_PTR;
m = slob_alloc(size + align, gfp, align, node);
if (!m)
return NULL;
*m = size;
return (void *)m + align;
} else {
void *ret;
ret = (void *)m + align;
ret = slob_new_page(gfp | __GFP_COMP, get_order(size), node);
kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC,
_RET_IP_, ret,
size, size + align, gfp, node);
} else {
unsigned int order = get_order(size);
ret = slob_new_page(gfp | __GFP_COMP, order, node);
if (ret) {
struct page *page;
page = virt_to_page(ret);
page->private = size;
}
return ret;
kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC,
_RET_IP_, ret,
size, PAGE_SIZE << order, gfp, node);
}
return ret;
}
EXPORT_SYMBOL(__kmalloc_node);
@ -501,6 +513,8 @@ void kfree(const void *block)
slob_free(m, *m + align);
} else
put_page(&sp->page);
kmemtrace_mark_free(KMEMTRACE_TYPE_KMALLOC, _RET_IP_, block);
}
EXPORT_SYMBOL(kfree);
@ -569,10 +583,19 @@ void *kmem_cache_alloc_node(struct kmem_cache *c, gfp_t flags, int node)
{
void *b;
if (c->size < PAGE_SIZE)
if (c->size < PAGE_SIZE) {
b = slob_alloc(c->size, flags, c->align, node);
else
kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE,
_RET_IP_, b, c->size,
SLOB_UNITS(c->size) * SLOB_UNIT,
flags, node);
} else {
b = slob_new_page(flags, get_order(c->size), node);
kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_CACHE,
_RET_IP_, b, c->size,
PAGE_SIZE << get_order(c->size),
flags, node);
}
if (c->ctor)
c->ctor(b);
@ -608,6 +631,8 @@ void kmem_cache_free(struct kmem_cache *c, void *b)
} else {
__kmem_cache_free(b, c->size);
}
kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, b);
}
EXPORT_SYMBOL(kmem_cache_free);