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mm, slub: print CPU id (and its node) on slab OOM

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Depending on how remote_node_defrag_ratio is configured, allocations can
end up in this path as a result of the local node being OOM, despite the
allocation overall being unconstrained (node == -1).

When we print a warning, printing the current CPU makes that situation
more clear (i.e., you can immediately see which node's OOM status
matters for the allocation at hand).

Acked-by: David Rientjes <rientjes@google.com>
Signed-off-by: Axel Rasmussen <axelrasmussen@google.com>
Signed-off-by: Vlastimil Babka <vbabka@suse.cz>
This commit is contained in:
Axel Rasmussen 2024-08-14 14:50:37 -07:00 committed by Vlastimil Babka
parent 4c39529663
commit bf6b9e9ba0
1 changed files with 3 additions and 2 deletions
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5
mm/slub.c
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@ -3416,14 +3416,15 @@ slab_out_of_memory(struct kmem_cache *s, gfp_t gfpflags, int nid)
{
static DEFINE_RATELIMIT_STATE(slub_oom_rs, DEFAULT_RATELIMIT_INTERVAL,
DEFAULT_RATELIMIT_BURST);
int cpu = raw_smp_processor_id();
int node;
struct kmem_cache_node *n;
if ((gfpflags & __GFP_NOWARN) || !__ratelimit(&slub_oom_rs))
return;
pr_warn("SLUB: Unable to allocate memory on node %d, gfp=%#x(%pGg)\n",
nid, gfpflags, &gfpflags);
pr_warn("SLUB: Unable to allocate memory on CPU %u (of node %d) on node %d, gfp=%#x(%pGg)\n",
cpu, cpu_to_node(cpu), nid, gfpflags, &gfpflags);
pr_warn(" cache: %s, object size: %u, buffer size: %u, default order: %u, min order: %u\n",
s->name, s->object_size, s->size, oo_order(s->oo),
oo_order(s->min));