kmemtrace: SLUB hooks.

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>

1 files changed, 59 insertions, 6 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 06da866..4c48a01 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -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);