Re: [PATCH 1/4] node: Define and export memory migration path

[Kirill A. Shutemov]

On Thu, Oct 17, 2019 at 02:12:05PM +0300, Kirill A. Shutemov wrote:
> > +		spin_lock(&node_migration_lock);
> > +		WRITE_ONCE(node_migration[nid], TERMINAL_NODE);
> > +		spin_unlock(&node_migration_lock);
> > +		return count;
> > +	}
> > +	if (next >= MAX_NUMNODES || !node_online(next))
> > +		return -EINVAL;
> 
> What prevents offlining after the check?

And what is story with memory hotplug interaction? I don't see any hooks
into memory hotplug to adjust migration path on offlining. Hm?

-- 
 Kirill A. Shutemov