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Subject[RFC PATCH 3/4] kmemtrace: SLUB hooks.
Date
This adds hooks for the SLUB allocator, to allow tracing with kmemtrace.

Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
---
include/linux/slub_def.h | 9 +++++++-
mm/slub.c | 47 ++++++++++++++++++++++++++++++++++++++++-----
2 files changed, 49 insertions(+), 7 deletions(-)

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index d117ea2..0cef121 100644
--- a/include/linux/slub_def.h
+++ b/include/linux/slub_def.h
@@ -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 */
@@ -205,7 +206,13 @@ void *__kmalloc(size_t size, gfp_t flags);

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, order);
+
+ kmemtrace_mark_alloc(KMEMTRACE_TYPE_KERNEL, _THIS_IP_, ret,
+ size, PAGE_SIZE << order, flags);
+
+ return ret;
}

static __always_inline void *kmalloc(size_t size, gfp_t flags)
diff --git a/mm/slub.c b/mm/slub.c
index 315c392..a6f930f 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -23,6 +23,7 @@
#include <linux/kallsyms.h>
#include <linux/memory.h>
#include <linux/math64.h>
+#include <linux/kmemtrace.h>

/*
* Lock order:
@@ -1652,14 +1653,25 @@ 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, __builtin_return_address(0));
+ void *ret = slab_alloc(s, gfpflags, -1, __builtin_return_address(0));
+
+ kmemtrace_mark_alloc(KMEMTRACE_TYPE_CACHE, _RET_IP_, ret,
+ s->objsize, s->size, gfpflags);
+
+ return ret;
}
EXPORT_SYMBOL(kmem_cache_alloc);

#ifdef CONFIG_NUMA
void *kmem_cache_alloc_node(struct kmem_cache *s, gfp_t gfpflags, int node)
{
- return slab_alloc(s, gfpflags, node, __builtin_return_address(0));
+ void *ret = slab_alloc(s, gfpflags, node,
+ __builtin_return_address(0));
+
+ 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
@@ -1771,6 +1783,8 @@ void kmem_cache_free(struct kmem_cache *s, void *x)
page = virt_to_head_page(x);

slab_free(s, page, x, __builtin_return_address(0));
+
+ kmemtrace_mark_free(KMEMTRACE_TYPE_CACHE, _RET_IP_, x);
}
EXPORT_SYMBOL(kmem_cache_free);

@@ -2676,6 +2690,7 @@ 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);
@@ -2685,7 +2700,12 @@ void *__kmalloc(size_t size, gfp_t flags)
if (unlikely(ZERO_OR_NULL_PTR(s)))
return s;

- return slab_alloc(s, flags, -1, __builtin_return_address(0));
+ ret = slab_alloc(s, flags, -1, __builtin_return_address(0));
+
+ kmemtrace_mark_alloc(KMEMTRACE_TYPE_KERNEL, _RET_IP_, ret,
+ size, (size_t) s->size, (unsigned long) flags);
+
+ return ret;
}
EXPORT_SYMBOL(__kmalloc);

@@ -2704,16 +2724,29 @@ 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_KERNEL, _RET_IP_, ret,
+ size, PAGE_SIZE << get_order(size),
+ (unsigned long) flags, node);
+
+ return ret;
+ }

s = get_slab(size, flags);

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

- return slab_alloc(s, flags, node, __builtin_return_address(0));
+ ret = slab_alloc(s, flags, node, __builtin_return_address(0));
+
+ kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KERNEL, _RET_IP_, ret,
+ size, s->size, (unsigned long) flags, node);
+
+ return ret;
}
EXPORT_SYMBOL(__kmalloc_node);
#endif
@@ -2771,6 +2804,8 @@ void kfree(const void *x)
return;
}
slab_free(page->slab, page, object, __builtin_return_address(0));
+
+ kmemtrace_mark_free(KMEMTRACE_TYPE_KERNEL, _RET_IP_, x);
}
EXPORT_SYMBOL(kfree);

--
1.5.6.1


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