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>

2 files changed, 109 insertions, 9 deletions

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 2f5c16b1aacd..dc28432b5b9a 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 */
@@ -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);
 }
diff --git a/mm/slub.c b/mm/slub.c
index 06da86654875..4c48a0146afd 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);