[PATCH 0/4] io-controller: Add new interfaces to trace backloggedgroup status

From: Gui Jianfeng
Date: Fri May 21 2010 - 04:42:48 EST


This series implements three new interfaces to keep track of tranferred bytes,
elapsing time and io rate since group getting backlogged. If the group dequeues
from service tree, these three interfaces will reset and shows zero.

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