> 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.
I'm sorry, but I don't think I understand what you mean... :-(
Could you explain more?
Which slabs should be shrinked? kmem_cache_node and kmem_cache_cpu?
I think kmem_cache_cpu should be disabled by cpu hotplug,
not memory/node hotplug. Basically, cpu should be offlined before
memory offline on the node.
Sorry, I'm confusing now...
--
Yasunori Goto
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