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authorPekka Enberg <penberg@cs.helsinki.fi>2008-05-09 20:35:53 +0200
committerVegard Nossum <vegard.nossum@gmail.com>2009-06-15 12:40:08 +0200
commitc175eea466e760de4b69b9aad90157e7aa9ff54f (patch)
tree60bc1c115d77bba6fd6f99818eeeef2165d8e30c
parent5a896d9e7c921742d0437a452f991288f4dc2c42 (diff)
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slab: add hooks for kmemcheck
We now have SLAB support for kmemcheck! This means that it doesn't matter whether one chooses SLAB or SLUB, or indeed whether Linus chooses to chuck SLAB or SLUB.. ;-) Cc: Ingo Molnar <mingo@elte.hu> Cc: Christoph Lameter <clameter@sgi.com> Cc: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi> [rebased for mainline inclusion] Signed-off-by: Vegard Nossum <vegard.nossum@gmail.com>
-rw-r--r--mm/slab.c20
1 files changed, 18 insertions, 2 deletions
diff --git a/mm/slab.c b/mm/slab.c
index bf0c3af143f..95b6c5eb40b 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -114,6 +114,7 @@
#include <linux/rtmutex.h>
#include <linux/reciprocal_div.h>
#include <linux/debugobjects.h>
+#include <linux/kmemcheck.h>
#include <asm/cacheflush.h>
#include <asm/tlbflush.h>
@@ -179,13 +180,13 @@
SLAB_STORE_USER | \
SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \
SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD | \
- SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE)
+ SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE | SLAB_NOTRACK)
#else
# define CREATE_MASK (SLAB_HWCACHE_ALIGN | \
SLAB_CACHE_DMA | \
SLAB_RECLAIM_ACCOUNT | SLAB_PANIC | \
SLAB_DESTROY_BY_RCU | SLAB_MEM_SPREAD | \
- SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE)
+ SLAB_DEBUG_OBJECTS | SLAB_NOLEAKTRACE | SLAB_NOTRACK)
#endif
/*
@@ -1624,6 +1625,10 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
NR_SLAB_UNRECLAIMABLE, nr_pages);
for (i = 0; i < nr_pages; i++)
__SetPageSlab(page + i);
+
+ if (kmemcheck_enabled && !(cachep->flags & SLAB_NOTRACK))
+ kmemcheck_alloc_shadow(cachep, flags, nodeid, page, cachep->gfporder);
+
return page_address(page);
}
@@ -1636,6 +1641,9 @@ static void kmem_freepages(struct kmem_cache *cachep, void *addr)
struct page *page = virt_to_page(addr);
const unsigned long nr_freed = i;
+ if (kmemcheck_page_is_tracked(page))
+ kmemcheck_free_shadow(cachep, page, cachep->gfporder);
+
if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
sub_zone_page_state(page_zone(page),
NR_SLAB_RECLAIMABLE, nr_freed);
@@ -3309,6 +3317,9 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
kmemleak_alloc_recursive(ptr, obj_size(cachep), 1, cachep->flags,
flags);
+ if (likely(ptr))
+ kmemcheck_slab_alloc(cachep, flags, ptr, obj_size(cachep));
+
if (unlikely((flags & __GFP_ZERO) && ptr))
memset(ptr, 0, obj_size(cachep));
@@ -3367,6 +3378,9 @@ __cache_alloc(struct kmem_cache *cachep, gfp_t flags, void *caller)
flags);
prefetchw(objp);
+ if (likely(objp))
+ kmemcheck_slab_alloc(cachep, flags, objp, obj_size(cachep));
+
if (unlikely((flags & __GFP_ZERO) && objp))
memset(objp, 0, obj_size(cachep));
@@ -3483,6 +3497,8 @@ static inline void __cache_free(struct kmem_cache *cachep, void *objp)
kmemleak_free_recursive(objp, cachep->flags);
objp = cache_free_debugcheck(cachep, objp, __builtin_return_address(0));
+ kmemcheck_slab_free(cachep, objp, obj_size(cachep));
+
/*
* Skip calling cache_free_alien() when the platform is not numa.
* This will avoid cache misses that happen while accessing slabp (which