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@xxxxxxxxxx>
Signed-off-by: Axel Rasmussen <axelrasmussen@xxxxxxxxxx>
---
mm/slub.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/slub.c b/mm/slub.c
index c9d8a2497fd6..3088260bf75d 100644
--- a/mm/slub.c
+++ b/mm/slub.c
@@ -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));
--
2.46.0.184.g6999bdac58-goog
