Siddha, Suresh B a écrit :
Christoph,
While we are at this topic, recently I had reports that
cache_free_alien() is costly on non NUMA platforms too (similar
to the cache miss issues that Eric was referring to on NUMA)
and the appended patch seems to fix it for non NUMA atleast.
Appended patch gives a nice 1% perf improvement on non-NUMA platform
with database workload.
Please comment or Ack for mainline :)
I have one comment :)
@@ -1394,6 +1394,9 @@ void __init kmem_cache_init(void)
int order;
int node;
+ if (num_online_nodes() == 1)
+ use_alien_caches = 0;
+
Unfortunatly this part is wrong.
You should check num_possible_nodes(), or nr_node_ids (this one is cheaper,
its a variable instead of a function call)
I wonder if we could add a new SLAB_NUMA_BYPASS, so that we can declare some
kmem_cache as non NUMA aware (for example, I feel network skb dont need the
NUMA overhead)
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