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authorDavid Rientjes <rientjes@google.com>2014-06-04 16:06:36 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-06-04 16:53:56 -0700
commit9a02d699935c9acdfefe431bbc33771d1d87da7f (patch)
tree907ec863b45a5ed64a46e671a1e4a91a9fece614
parentecc42fbe952fa4aae88c2413e21912b1d665fb93 (diff)
downloadop-kernel-dev-9a02d699935c9acdfefe431bbc33771d1d87da7f.zip
op-kernel-dev-9a02d699935c9acdfefe431bbc33771d1d87da7f.tar.gz
mm, slab: suppress out of memory warning unless debug is enabled
When the slab or slub allocators cannot allocate additional slab pages, they emit diagnostic information to the kernel log such as current number of slabs, number of objects, active objects, etc. This is always coupled with a page allocation failure warning since it is controlled by !__GFP_NOWARN. Suppress this out of memory warning if the allocator is configured without debug supported. The page allocation failure warning will indicate it is a failed slab allocation, the order, and the gfp mask, so this is only useful to diagnose allocator issues. Since CONFIG_SLUB_DEBUG is already enabled by default for the slub allocator, there is no functional change with this patch. If debug is disabled, however, the warnings are now suppressed. Signed-off-by: David Rientjes <rientjes@google.com> Cc: Pekka Enberg <penberg@kernel.org> Acked-by: Christoph Lameter <cl@linux.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--mm/slab.c10
-rw-r--r--mm/slub.c29
2 files changed, 25 insertions, 14 deletions
diff --git a/mm/slab.c b/mm/slab.c
index 19d9218..5c846d2 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -1621,10 +1621,16 @@ __initcall(cpucache_init);
static noinline void
slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
{
+#if DEBUG
struct kmem_cache_node *n;
struct page *page;
unsigned long flags;
int node;
+ static DEFINE_RATELIMIT_STATE(slab_oom_rs, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
+
+ if ((gfpflags & __GFP_NOWARN) || !__ratelimit(&slab_oom_rs))
+ return;
printk(KERN_WARNING
"SLAB: Unable to allocate memory on node %d (gfp=0x%x)\n",
@@ -1662,6 +1668,7 @@ slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
node, active_slabs, num_slabs, active_objs, num_objs,
free_objects);
}
+#endif
}
/*
@@ -1683,8 +1690,7 @@ static struct page *kmem_getpages(struct kmem_cache *cachep, gfp_t flags,
page = alloc_pages_exact_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
if (!page) {
- if (!(flags & __GFP_NOWARN) && printk_ratelimit())
- slab_out_of_memory(cachep, flags, nodeid);
+ slab_out_of_memory(cachep, flags, nodeid);
return NULL;
}
diff --git a/mm/slub.c b/mm/slub.c
index de99d50..65a0a5c 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -2119,11 +2119,19 @@ static inline int node_match(struct page *page, int node)
return 1;
}
+#ifdef CONFIG_SLUB_DEBUG
static int count_free(struct page *page)
{
return page->objects - page->inuse;
}
+static inline unsigned long node_nr_objs(struct kmem_cache_node *n)
+{
+ return atomic_long_read(&n->total_objects);
+}
+#endif /* CONFIG_SLUB_DEBUG */
+
+#if defined(CONFIG_SLUB_DEBUG) || defined(CONFIG_SYSFS)
static unsigned long count_partial(struct kmem_cache_node *n,
int (*get_count)(struct page *))
{
@@ -2137,21 +2145,19 @@ static unsigned long count_partial(struct kmem_cache_node *n,
spin_unlock_irqrestore(&n->list_lock, flags);
return x;
}
-
-static inline unsigned long node_nr_objs(struct kmem_cache_node *n)
-{
-#ifdef CONFIG_SLUB_DEBUG
- return atomic_long_read(&n->total_objects);
-#else
- return 0;
-#endif
-}
+#endif /* CONFIG_SLUB_DEBUG || CONFIG_SYSFS */
static noinline void
slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
{
+#ifdef CONFIG_SLUB_DEBUG
+ static DEFINE_RATELIMIT_STATE(slub_oom_rs, DEFAULT_RATELIMIT_INTERVAL,
+ DEFAULT_RATELIMIT_BURST);
int node;
+ if ((gfpflags & __GFP_NOWARN) || !__ratelimit(&slub_oom_rs))
+ return;
+
pr_warn("SLUB: Unable to allocate memory on node %d (gfp=0x%x)\n",
nid, gfpflags);
pr_warn(" cache: %s, object size: %d, buffer size: %d, default order: %d, min order: %d\n",
@@ -2178,6 +2184,7 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
pr_warn(" node %d: slabs: %ld, objs: %ld, free: %ld\n",
node, nr_slabs, nr_objs, nr_free);
}
+#endif
}
static inline void *new_slab_objects(struct kmem_cache *s, gfp_t flags,
@@ -2356,9 +2363,7 @@ new_slab:
freelist = new_slab_objects(s, gfpflags, node, &c);
if (unlikely(!freelist)) {
- if (!(gfpflags & __GFP_NOWARN) && printk_ratelimit())
- slab_out_of_memory(s, gfpflags, node);
-
+ slab_out_of_memory(s, gfpflags, node);
local_irq_restore(flags);
return NULL;
}
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