[PATCH 00/11] IO-less dirty throttling v12

From: Wu Fengguang
Date: Mon Oct 03 2011 - 09:46:01 EST


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!


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


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(-)


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