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Subject[PULL REQUEST] writeback changes for 3.2-rc1
Hi Linus,

The following changes since commit 9b13776977d45505469edc6decc93e9e3799afe2:

Merge branch 'for-linus' of git://git.infradead.org/users/sameo/mfd-2.6 (2011-10-02 19:23:44 -0700)

are available in the git repository at:

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

There are two patch series:

1) IO-less dirty throttling

By not submitting writeback IO from the dirtier tasks' context,
IO seeks _and_ CPU contentions could be greatly reduced.

Users may also notice much smoothed pause times in balance_dirty_pages()
and hence in the write() syscall, especially in cases NFS, JBOD and 2+
concurrent dd's. This will in general reduce stalls in the "pipeline"
type workloads that have the write() syscall inside its loop, such as

loop {
read() from network
write() to disk
}

The change will inevitably trigger regressions in some FS and/or
unknown workloads. However I've managed to address the known issues
and built the tracing/visualization scripts for debugging new ones
in the easy way :-)

2) report writeback reason in tracing events

I apologize for rebasing the writeback reason patches, which would
otherwise cost a merge commit. Either way is not good and I'll take
care next time to make the multiple topic branches either
fast-forwardable or base one series on top of the other.

Curt Wohlgemuth (2):
writeback: send work item to queue_io, move_expired_inodes
writeback: Add a 'reason' to wb_writeback_work

Wu Fengguang (14):
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
writeback: fix ppc compile warnings on do_div(long long, unsigned long)
writeback: trace event bdi_dirty_ratelimit
writeback: trace event balance_dirty_pages

fs/btrfs/extent-tree.c | 3 +-
fs/buffer.c | 2 +-
fs/ext4/inode.c | 2 +-
fs/fs-writeback.c | 84 +++--
fs/quota/quota.c | 2 +-
fs/sync.c | 4 +-
fs/ubifs/budget.c | 2 +-
include/linux/backing-dev.h | 14 +-
include/linux/sched.h | 7 +
include/linux/writeback.h | 33 ++-
include/trace/events/writeback.h | 161 +++++++--
kernel/fork.c | 3 +
mm/backing-dev.c | 7 +-
mm/page-writeback.c | 704 ++++++++++++++++++++++++++++++--------
mm/vmscan.c | 3 +-
15 files changed, 806 insertions(+), 225 deletions(-)

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