[PATCH 0/5] blkcg: Limit maximum number of aio requests available for cgroup

[Kirill Tkhai]

Hi,

this patch set introduces accounting aio_nr and aio_max_nr per blkio cgroup.
It may be used to limit number of aio requests, which are available for
a cgroup, and could be useful for containers.

The accounting is hierarchical, and aio contexts, allocated in child cgroup,
are accounted in parent cgroups too.

Also, new cgroup file "io.aio_nr" is introduced. It's used to set cgroup
aio requests limit, to show current limit and number of currenly occupied
requests.

Patches 1-3 are refactoring.
Patch 4 is the place where the accounting actually introduced.
Patch 5 adds "io.aio_nr" file.

---

Kirill Tkhai (5):
      aio: Move aio_nr increment to separate function
      aio: Export aio_nr_lock and aio_max_nr initial value to include/linux/aio.h
      blkcg: Add blkcg::blkg_aio_nr and blkcg::blkg_aio_max_nr
      blkcg: Charge aio requests in blkio cgroup hierarchy
      blkcg: Add cgroup file to configure blkcg::blkg_aio_max_nr


 block/blk-cgroup.c         |   88 +++++++++++++++++++++++++-
 fs/aio.c                   |  151 ++++++++++++++++++++++++++++++++++++++++----
 include/linux/aio.h        |   21 ++++++
 include/linux/blk-cgroup.h |    4 +
 4 files changed, 247 insertions(+), 17 deletions(-)

--
Signed-off-by: Kirill Tkhai <ktkhai@xxxxxxxxxxxxx>