From: Michael Rubin on
Debugging writeback issues and tuning an application's writeback activity is
easier when the activity is visible. With large clusters, classifying
and root causing writeback problems has been a big headache. This patch
series contains a series of patches that our team has been using to start
getting a handle on writeback behaviour. These changes should be helpful
for single system maintainers also. It's still a big headache.

Once these changes are reviewed I will make sure the Documentation files
are updated, but I expect some back and forth first.

Michael Rubin (3):
writeback: Creating /sys/kernel/mm/writeback/writeback
writeback: per bdi monitoring
writeback: tracking subsystems causing writeback

drivers/base/node.c | 14 +++++
fs/buffer.c | 2 +-
fs/fs-writeback.c | 28 +++++++--
fs/nilfs2/segment.c | 4 +-
fs/sync.c | 2 +-
include/linux/backing-dev.h | 9 +++
include/linux/mmzone.h | 2 +
include/linux/writeback.h | 50 +++++++++++++++-
mm/backing-dev.c | 137 ++++++++++++++++++++++---------------------
mm/mm_init.c | 122 ++++++++++++++++++++++++++++++++++++++
mm/page-writeback.c | 18 ++++--
mm/vmscan.c | 3 +-
mm/vmstat.c | 2 +
13 files changed, 311 insertions(+), 82 deletions(-)

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