[RFC] [PATCH 0/6] Provide cgroup isolation for buffered writes.

[Justin TerAvest]

This patchset adds tracking to the page_cgroup structure for which cgroup has
dirtied a page, and uses that information to provide isolation between
cgroups performing writeback.

I know that there is some discussion to remove request descriptor limits
entirely, but I included a patch to introduce per-cgroup limits to enable
this functionality. Without it, we didn't see much isolation improvement.

I think most of this material has been discussed on lkml previously, this is
just another attempt to make a patchset that handles buffered writes for CFQ.

There was a lot of previous discussion at:
  http://thread.gmane.org/gmane.linux.kernel/1007922

Thanks to Andrea Righi, Kamezawa Hiroyuki, Munehiro Ikeda, Nauman Rafique,
and Vivek Goyal for work on previous versions of these patches.


 Documentation/block/biodoc.txt |   10 +
 block/blk-cgroup.c             |  204 +++++++++++++++++++++-
 block/blk-cgroup.h             |    9 +-
 block/blk-core.c               |  216 +++++++++++++++--------
 block/blk-settings.c           |    2 +-
 block/blk-sysfs.c              |   60 ++++---
 block/cfq-iosched.c            |  390 +++++++++++++++++++++++++++++++---------
 block/cfq.h                    |    6 +-
 block/elevator.c               |   11 +-
 fs/buffer.c                    |    2 +
 fs/direct-io.c                 |    2 +
 include/linux/blk_types.h      |    2 +
 include/linux/blkdev.h         |   81 ++++++++-
 include/linux/blkio-track.h    |   89 +++++++++
 include/linux/elevator.h       |   14 ++-
 include/linux/iocontext.h      |    1 +
 include/linux/memcontrol.h     |    6 +
 include/linux/mmzone.h         |    4 +-
 include/linux/page_cgroup.h    |   12 +-
 init/Kconfig                   |   16 ++
 mm/Makefile                    |    3 +-
 mm/bounce.c                    |    2 +
 mm/filemap.c                   |    2 +
 mm/memcontrol.c                |    6 +
 mm/memory.c                    |    6 +
 mm/page-writeback.c            |   14 ++-
 mm/page_cgroup.c               |   29 ++-
 mm/swap_state.c                |    2 +
 28 files changed, 985 insertions(+), 216 deletions(-)

[PATCH 1/6] Add IO cgroup tracking for buffered writes.
[PATCH 2/6] Make async queues per cgroup.
[PATCH 3/6] Modify CFQ to use IO tracking information.
[PATCH 4/6] With per-cgroup async, don't special case queues.
[PATCH 5/6] Add stat for per cgroup writeout done by flusher.
[PATCH 6/6] Per cgroup request descriptor counts

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