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SubjectTREE_SRCU slows hotplug by factor ~16
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Greetings,

Running Steven's hotplug stress script in tip w. CLASSIC_SRCU takes 55s
in my i4790 box, whereas TREE_SRCU takes over 16m. (Master with the
same config does it in 39s.. but then lockdep isn't enabled in master)

-Mike

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