The patch titled
Subject: slub: track number of slabs irrespective of CONFIG_SLUB_DEBUG
has been added to the -mm tree. Its filename is
slub-track-number-of-slabs-irrespective-of-config_slub_debug.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/slub-track-number-of-slabs-irrespective-of-config_slub_debug.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/slub-track-number-of-slabs-irrespective-of-config_slub_debug.patch
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------------------------------------------------------
From: Shakeel Butt <shakeelb@xxxxxxxxxx>
Subject: slub: track number of slabs irrespective of CONFIG_SLUB_DEBUG
For !CONFIG_SLUB_DEBUG, SLUB does not maintain the number of slabs
allocated per node for a kmem_cache. Thus, slabs_node() in
__kmem_cache_empty(), __kmem_cache_shrink() and __kmem_cache_destroy()
will always return 0 for such config. This is wrong and can cause issues
for all users of these functions.
In fact in [1] Jason has reported a system crash while using SLUB without
CONFIG_SLUB_DEBUG. The reason was the usage of slabs_node() by
__kmem_cache_empty().
The right solution is to make slabs_node() work even for
!CONFIG_SLUB_DEBUG. The commit 0f389ec63077 ("slub: No need for per node
slab counters if !SLUB_DEBUG") had put the per node slab counter under
CONFIG_SLUB_DEBUG because it was only read through sysfs API and the sysfs
API was disabled on !CONFIG_SLUB_DEBUG. However the users of the per node
slab counter assumed that it will work in the absence of
CONFIG_SLUB_DEBUG. So, make the counter work for !CONFIG_SLUB_DEBUG.
Please note that f9e13c0a5a33 ("slab, slub: skip unnecessary
kasan_cache_shutdown()") exposed this issue but it is present even before.
[1] http://lkml.kernel.org/r/CAHmME9rtoPwxUSnktxzKso14iuVCWT7BE_-_8PAC=pGw1iJnQg@xxxxxxxxxxxxxx
Link: http://lkml.kernel.org/r/20180620224147.23777-1-shakeelb@xxxxxxxxxx
Fixes: f9e13c0a5a33 ("slab, slub: skip unnecessary kasan_cache_shutdown()")
Signed-off-by: Shakeel Butt <shakeelb@xxxxxxxxxx>
Suggested-by: David Rientjes <rientjes@xxxxxxxxxx>
Reported-by: Jason A . Donenfeld <Jason@xxxxxxxxx>
Cc: Christoph Lameter <cl@xxxxxxxxx>
Cc: Pekka Enberg <penberg@xxxxxxxxxx>
Cc: Joonsoo Kim <iamjoonsoo.kim@xxxxxxx>
Cc: Andrey Ryabinin <aryabinin@xxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/slab.h | 2 -
mm/slub.c | 80 ++++++++++++++++++++++++----------------------------
2 files changed, 38 insertions(+), 44 deletions(-)
diff -puN mm/slab.h~slub-track-number-of-slabs-irrespective-of-config_slub_debug mm/slab.h
--- a/mm/slab.h~slub-track-number-of-slabs-irrespective-of-config_slub_debug
+++ a/mm/slab.h
@@ -473,8 +473,8 @@ struct kmem_cache_node {
#ifdef CONFIG_SLUB
unsigned long nr_partial;
struct list_head partial;
-#ifdef CONFIG_SLUB_DEBUG
atomic_long_t nr_slabs;
+#ifdef CONFIG_SLUB_DEBUG
atomic_long_t total_objects;
struct list_head full;
#endif
diff -puN mm/slub.c~slub-track-number-of-slabs-irrespective-of-config_slub_debug mm/slub.c
--- a/mm/slub.c~slub-track-number-of-slabs-irrespective-of-config_slub_debug
+++ a/mm/slub.c
@@ -1030,42 +1030,6 @@ static void remove_full(struct kmem_cach
list_del(&page->lru);
}
-/* Tracking of the number of slabs for debugging purposes */
-static inline unsigned long slabs_node(struct kmem_cache *s, int node)
-{
- struct kmem_cache_node *n = get_node(s, node);
-
- return atomic_long_read(&n->nr_slabs);
-}
-
-static inline unsigned long node_nr_slabs(struct kmem_cache_node *n)
-{
- return atomic_long_read(&n->nr_slabs);
-}
-
-static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects)
-{
- struct kmem_cache_node *n = get_node(s, node);
-
- /*
- * May be called early in order to allocate a slab for the
- * kmem_cache_node structure. Solve the chicken-egg
- * dilemma by deferring the increment of the count during
- * bootstrap (see early_kmem_cache_node_alloc).
- */
- if (likely(n)) {
- atomic_long_inc(&n->nr_slabs);
- atomic_long_add(objects, &n->total_objects);
- }
-}
-static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects)
-{
- struct kmem_cache_node *n = get_node(s, node);
-
- atomic_long_dec(&n->nr_slabs);
- atomic_long_sub(objects, &n->total_objects);
-}
-
/* Object debug checks for alloc/free paths */
static void setup_object_debug(struct kmem_cache *s, struct page *page,
void *object)
@@ -1321,16 +1285,46 @@ slab_flags_t kmem_cache_flags(unsigned i
#define disable_higher_order_debug 0
+#endif /* CONFIG_SLUB_DEBUG */
+
static inline unsigned long slabs_node(struct kmem_cache *s, int node)
- { return 0; }
+{
+ struct kmem_cache_node *n = get_node(s, node);
+
+ return atomic_long_read(&n->nr_slabs);
+}
+
static inline unsigned long node_nr_slabs(struct kmem_cache_node *n)
- { return 0; }
-static inline void inc_slabs_node(struct kmem_cache *s, int node,
- int objects) {}
-static inline void dec_slabs_node(struct kmem_cache *s, int node,
- int objects) {}
+{
+ return atomic_long_read(&n->nr_slabs);
+}
-#endif /* CONFIG_SLUB_DEBUG */
+static inline void inc_slabs_node(struct kmem_cache *s, int node, int objects)
+{
+ struct kmem_cache_node *n = get_node(s, node);
+
+ /*
+ * May be called early in order to allocate a slab for the
+ * kmem_cache_node structure. Solve the chicken-egg
+ * dilemma by deferring the increment of the count during
+ * bootstrap (see early_kmem_cache_node_alloc).
+ */
+ if (likely(n)) {
+ atomic_long_inc(&n->nr_slabs);
+#ifdef CONFIG_SLUB_DEBUG
+ atomic_long_add(objects, &n->total_objects);
+#endif
+ }
+}
+static inline void dec_slabs_node(struct kmem_cache *s, int node, int objects)
+{
+ struct kmem_cache_node *n = get_node(s, node);
+
+ atomic_long_dec(&n->nr_slabs);
+#ifdef CONFIG_SLUB_DEBUG
+ atomic_long_sub(objects, &n->total_objects);
+#endif
+}
/*
* Hooks for other subsystems that check memory allocations. In a typical
_
Patches currently in -mm which might be from shakeelb@xxxxxxxxxx are
slub-track-number-of-slabs-irrespective-of-config_slub_debug.patch
slub-fix-__kmem_cache_empty-for-config_slub_debug.patch
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