I have been following this thread as an interested spectator, not having had the opportunity to "play". Even zLinux has had large pages for a while now - pity about z/VM ... ahem. Linux doesn't attempt to break up large pages under memory pressure, but does allow the number of such pages to be dynamically adjusted (I haven't checked the zLinux code, but I presume it does likewise). It also spreads the allocation across any (NUMA) memory nodes that are available - does zSeries do likewise across multiple books ?.
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