kmemtrace: SLUB hooks for caller-tracking functions.

This patch adds kmemtrace hooks for __kmalloc_track_caller() and
__kmalloc_node_track_caller(). Currently, they set the call site pointer
to the value recieved as a parameter. (This could change if we implement
stack trace exporting in kmemtrace.)

Signed-off-by: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>

1 files changed, 17 insertions, 2 deletions

diff --git a/mm/slub.c b/mm/slub.c
index 4c48a0146afd..4ce61c86f581 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -3256,6 +3256,7 @@ static struct notifier_block __cpuinitdata slab_notifier = {
 void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
 {
         struct kmem_cache *s;
+        void *ret;
 
         if (unlikely(size > PAGE_SIZE))
                 return kmalloc_large(size, gfpflags);
@@ -3265,13 +3266,20 @@ void *__kmalloc_track_caller(size_t size, gfp_t gfpflags, unsigned long caller)
         if (unlikely(ZERO_OR_NULL_PTR(s)))
                 return s;
 
-        return slab_alloc(s, gfpflags, -1, caller);
+        ret = slab_alloc(s, gfpflags, -1, caller);
+
+        /* Honor the call site pointer we recieved. */
+        kmemtrace_mark_alloc(KMEMTRACE_TYPE_KMALLOC, (unsigned long) caller,
+                             ret, size, s->size, gfpflags);
+
+        return ret;
 }
 
 void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
                                         int node, unsigned long caller)
 {
         struct kmem_cache *s;
+        void *ret;
 
         if (unlikely(size > PAGE_SIZE))
                 return kmalloc_large_node(size, gfpflags, node);
@@ -3281,7 +3289,14 @@ void *__kmalloc_node_track_caller(size_t size, gfp_t gfpflags,
         if (unlikely(ZERO_OR_NULL_PTR(s)))
                 return s;
 
-        return slab_alloc(s, gfpflags, node, caller);
+        ret = slab_alloc(s, gfpflags, node, caller);
+
+        /* Honor the call site pointer we recieved. */
+        kmemtrace_mark_alloc_node(KMEMTRACE_TYPE_KMALLOC,
+                                  (unsigned long) caller, ret,
+                                  size, s->size, gfpflags, node);
+
+        return ret;
 }
 
 #ifdef CONFIG_SLUB_DEBUG