Here is the v2 of the patch which introduces APIs to read controller

Here is the v2 of the patch which introduces APIs to read controller
specific stats. Added Makefile.am updates which I had missed in the
previous post.

New APIs to read controller specific statistics.

This patch introduces 3 new APIs which can be used to read controller
statistics iteratively. (Eg. stats from memory.stat etc)

Reading of stats is initiated by cgroup_read_stats_begin() API, which
returns the first stat of the requested controller in addition to returing
a handle that should be used in subsequent reads.

cgroup_read_stats_next() API can be used to read the remaining stats
one by one. This needs the handle returned by cgroup_read_stats_begin().

cgroup_read_stats_end() API will terminate the stats reading iteration
initiated by cgroup_read_stats_begin().

Changelog:

v2
- Update tests/Makefile.am so that it generates appropriate rules
  for tests/read_stats.c in the Makefile. This is in addition to
  the manual updates done to the generated file tests/Makefile.in.

v1
- cgroup_read_stats apis now work with relative cgroup path names instead
  of absolute path names.

v0
- Initial post.

Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
Signed-off-by: Balbir Singh <balbir@linux.vnet.ibm.com>