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>

diff --git a/include/linux/slub_def.h b/include/linux/slub_def.h
index 2f5c16b..dc28432 100644 (file)
--- 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 06da866..4c48a01 100644 (file)
--- 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);