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ref: 5e8a716c1d9a247fe2de4c98935bc785edfee7b2 parent: 3e538617cdead5397f61af82dbb7b6eaafdff62c author: huade <huashi@cisco.com> date: Thu Feb 25 05:08:41 EST 2016
add thread-based slice buffer and refact reallocate process for futher change