Messages in this thread | | | Date | Fri, 01 Aug 2008 08:51:58 -0500 | From | Christoph Lameter <> | Subject | Re: [RFC:Patch: 000/008](memory hotplug) rough idea of pgdat removing |
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Yasunori Goto wrote:
> I thought it at first, but are there the following worst case? > > > CPU 0 CPU 1 > ------------------------------------------------------- > __alloc_pages() > > parsing_zonelist() > : > enter page_reclarim() > sleep (and remember zone) : > : > update zonelist and node_online_map > with stop_machine_run() > free pgdat(). > remove the Node electrically. > > wake up and touch remembered > zone, but it is removed > (Oops!!!) > > > > Anyway, I'm happy if there is better way than my poor idea. :-) > > Thanks for your comment.
Duh. Then the use of RCU would also mean that all of reclaim must be in a rcu period. So reclaim cannot sleep anymore.
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