mm: SLAB Out-of-memory diagnostics
Following the example at mm/slub.c, add out-of-memory diagnostics to the SLAB allocator to help on debugging certain OOM conditions. An example print out looks like this: <snip page allocator out-of-memory message> SLAB: Unable to allocate memory on node 0 (gfp=0x11200) cache: bio-0, object size: 192, order: 0 node 0: slabs: 3/3, objs: 60/60, free: 0 Signed-off-by: Rafael Aquini <aquini@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Pekka Enberg <penberg@kernel.org>
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51
mm/slab.c
51
mm/slab.c
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@ -1731,6 +1731,52 @@ static int __init cpucache_init(void)
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}
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__initcall(cpucache_init);
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static noinline void
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slab_out_of_memory(struct kmem_cache *cachep, gfp_t gfpflags, int nodeid)
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{
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struct kmem_list3 *l3;
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struct slab *slabp;
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unsigned long flags;
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int node;
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printk(KERN_WARNING
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"SLAB: Unable to allocate memory on node %d (gfp=0x%x)\n",
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nodeid, gfpflags);
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printk(KERN_WARNING " cache: %s, object size: %d, order: %d\n",
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cachep->name, cachep->buffer_size, cachep->gfporder);
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for_each_online_node(node) {
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unsigned long active_objs = 0, num_objs = 0, free_objects = 0;
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unsigned long active_slabs = 0, num_slabs = 0;
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l3 = cachep->nodelists[node];
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if (!l3)
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continue;
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spin_lock_irqsave(&l3->list_lock, flags);
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list_for_each_entry(slabp, &l3->slabs_full, list) {
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active_objs += cachep->num;
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active_slabs++;
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}
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list_for_each_entry(slabp, &l3->slabs_partial, list) {
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active_objs += slabp->inuse;
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active_slabs++;
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}
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list_for_each_entry(slabp, &l3->slabs_free, list)
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num_slabs++;
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free_objects += l3->free_objects;
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spin_unlock_irqrestore(&l3->list_lock, flags);
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num_slabs += active_slabs;
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num_objs = num_slabs * cachep->num;
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printk(KERN_WARNING
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" node %d: slabs: %ld/%ld, objs: %ld/%ld, free: %ld\n",
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node, active_slabs, num_slabs, active_objs, num_objs,
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free_objects);
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}
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}
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/*
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* Interface to system's page allocator. No need to hold the cache-lock.
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*
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@ -1757,8 +1803,11 @@ static void *kmem_getpages(struct kmem_cache *cachep, gfp_t flags, int nodeid)
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flags |= __GFP_RECLAIMABLE;
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page = alloc_pages_exact_node(nodeid, flags | __GFP_NOTRACK, cachep->gfporder);
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if (!page)
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if (!page) {
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if (!(flags & __GFP_NOWARN) && printk_ratelimit())
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slab_out_of_memory(cachep, flags, nodeid);
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return NULL;
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}
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nr_pages = (1 << cachep->gfporder);
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if (cachep->flags & SLAB_RECLAIM_ACCOUNT)
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