write bandwidth estimation and writeback fixes v2

Hi,

These patches are mainly seperated out from the original IO-less writeback
patchset. They are general useful as standalone improvements.

The v1 patches were posted in two threads:

	http://lkml.org/lkml/2011/6/12/69
	http://lkml.org/lkml/2011/6/19/97

In addition to the changes posted in the above threads, I also extended the
global_dirty_state trace with more fields, and improved some more changelog.

	[PATCH 1/9] writeback: make writeback_control.nr_to_write straight
	[PATCH 2/9] writeback: account per-bdi accumulated written pages
	[PATCH 3/9] writeback: bdi write bandwidth estimation
	[PATCH 4/9] writeback: show bdi write bandwidth in debugfs
	[PATCH 5/9] writeback: consolidate variable names in balance_dirty_pages()
	[PATCH 6/9] writeback: introduce smoothed global dirty limit
	[PATCH 7/9] writeback: introduce max-pause and pass-good dirty limits
	[PATCH 8/9] writeback: scale IO chunk size up to half device bandwidth
	[PATCH 9/9] writeback: trace global_dirty_state

They are git pullable from

git://git.kernel.org/pub/scm/linux/kernel/git/wfg/writeback.git fs-writeback

Thanks,
Fengguang


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