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    SubjectRe: [patch] slab: add memory hotplug support
    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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