IO-less dirty throttling v10

Hi,

The core algorithms for IO-less balance_dirty_pages().

git://git.kernel.org/pub/scm/linux/kernel/git/wfg/writeback.git dirty-throttling-v10

Changes since v9:

- a lot of renames and comment/changelog rework, again
- seperate out the dirty_ratelimit update policy (as patch 04)
- add think time compensation
- add 3 trace events

Changes since v8:

- a lot of renames and comment/changelog rework
- use 3rd order polynomial as the global control line (Peter)
- stabilize dirty_ratelimit by decreasing update step size on small errors
- limit per-CPU dirtied pages to avoid dirty pages run away on 1k+ tasks (Peter)

Thanks a lot to Peter, Vivek and Andrea for the careful reviews!

shortlog:

Wu Fengguang (10):
writeback: account per-bdi accumulated dirtied pages
writeback: dirty position control
writeback: dirty rate control
writeback: stabilize bdi->dirty_ratelimit
writeback: per task dirty rate limit
writeback: IO-less balance_dirty_pages()
writeback: dirty ratelimit - think time compensation
writeback: trace balance_dirty_pages
writeback: trace dirty_ratelimit
trace task_io (RFC)

diffstat:

	 fs/fs-writeback.c                |    2 +-
	 include/linux/backing-dev.h      |    8 +
	 include/linux/sched.h            |    8 +
	 include/linux/writeback.h        |    1 +
	 include/trace/events/writeback.h |  181 +++++++++--
	 kernel/fork.c                    |    4 +
	 mm/backing-dev.c                 |    3 +
	 mm/page-writeback.c              |  664 +++++++++++++++++++++++++++++---------
	 8 files changed, 693 insertions(+), 178 deletions(-)

Thanks,
Fengguang

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