IO-less dirty throttling v12

Hi,

This is the minimal IO-less balance_dirty_pages() changes that are expected to be regression free (well, except for NFS).

git://github.com/fengguang/linux.git dirty-throttling-v12

Tests results will be posted in a separate email.

Changes since v11:

- improve bdi reserve area parameters (based on test results)
- drop bdi underrun flag
- drop aux bdi control line
- make bdi->dirty_ratelimit more stable

Changes since v10:

- complete the renames
- add protections for IO queue underrun
- pause time reduction
- bdi reserve area
- bdi underrun flag
- more accurate task dirty accounting for
- sub-page writes
- FS re-dirties
- short lived tasks

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, Andrea and Jan for the careful reviews!

shortlog:

Wu Fengguang (11):
writeback: account per-bdi accumulated dirtied pages
writeback: dirty position control
writeback: add bg_threshold parameter to __bdi_update_bandwidth()
writeback: dirty rate control
writeback: stabilize bdi->dirty_ratelimit
writeback: per task dirty rate limit
writeback: IO-less balance_dirty_pages()
writeback: limit max dirty pause time
writeback: control dirty pause time
writeback: dirty position control - bdi reserve area
writeback: per-bdi background threshold

diffstat:

 fs/fs-writeback.c                |   19 +-
 include/linux/backing-dev.h      |   11 +
 include/linux/sched.h            |    7 +
 include/linux/writeback.h        |    1 +
 include/trace/events/writeback.h |   24 --
 kernel/fork.c                    |    3 +
 mm/backing-dev.c                 |    4 +
 mm/page-writeback.c              |  678 +++++++++++++++++++++++++++++---------
 8 files changed, 566 insertions(+), 181 deletions(-)

Thanks,
Fengguang

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