Hi I noticed on a small x86_64 NUMA setup (2 nodes) that cache_free_alien() is very expensive. This is because of a cache miss on struct slab. At the time an object is freed (call to kmem_cache_free() for example), the underlying 'struct slab' is not anymore cache-hot.
struct slab *slabp = virt_to_slab(objp); nodeid = slabp->nodeid; // cache miss So we currently need slab only to lookup nodeid, to be able to use the cachep cpu cache, or not. Couldn't we use something less expensive, like pfn_to_nid() ? On x86_64 pfn_to_nid usually shares one cache line for all objects (struct memnode) Is it possible virt_to_slab(objp)->nodeid being different from pfn_to_nid(objp) ? Eric - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [EMAIL PROTECTED] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
