Re: [patch] slab: add memory hotplug support

[David Rientjes]

On Tue, 2 Mar 2010, Christoph Lameter wrote:

> 
> Not sure how this would sync with slab use during node bootstrap and
> shutdown. Kame-san?
> 

All the nodelist allocation and initialization is done during 
MEM_GOING_ONLINE, so there should be no use of them until that 
notification cycle is done and it has graduated to MEM_ONLINE: if there 
are, there're even bigger problems because zonelist haven't even been 
built for that pgdat yet.  I can only speculate, but since Andi's 
patchset did all this during MEM_ONLINE, where the bit is already set in 
node_states[N_HIGH_MEMORY] and is passable to kmalloc_node(), this is 
probably why additional hacks had to be added elsewhere.

Other than that, concurrent kmem_cache_create() is protected by 
cache_chain_mutex.
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