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SubjectRe: [Patch / 002](memory hotplug) Callback function to create kmem_cache_node.
On Tue, 2 Oct 2007, Yasunori Goto wrote:

> Do you mean that just nr_slabs should be checked like followings?
> I'm not sure this is enough.
>
> :
> if (s->node[nid]) {
> n = get_node(s, nid);
> if (!atomic_read(&n->nr_slabs)) {
> s->node[nid] = NULL;
> kmem_cache_free(kmalloc_caches, n);
> }
> }
> :
> :

That would work. But it would be better to shrink the cache first. The
first 2 slabs on a node may be empty and the shrinking will remove those.
If you do not shrink then the code may falsely assume that there are
objects on the node.
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