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Commit 5b882be4 authored by Eduard - Gabriel Munteanu's avatar Eduard - Gabriel Munteanu Committed by Pekka Enberg
Browse files

kmemtrace: SLUB hooks. 



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

Signed-off-by: default avatarEduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
parent 3eae2cb2

include/linux/slub_def.h

+50 −3
Original line number Diff line number Diff line
@@ -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 */
@@ -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);
@@ -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);
@@ -231,8 +256,24 @@ 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);
@@ -240,7 +281,13 @@ static __always_inline void *kmalloc_node(size_t size, gfp_t flags, int node) 
		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);

}

mm/slub.c

+59 −6
Original line number Diff line number Diff line
@@ -24,6 +24,7 @@ 
#include <linux/kallsyms.h>

#include <linux/memory.h>

#include <linux/math64.h>

#include <linux/kmemtrace.h>



/*

 * Lock order:
@@ -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.
@@ -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);
@@ -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);
@@ -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);
@@ -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
@@ -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);