[PATCH RFC v0 3/3] memcg: implement memory thresholds

[Kirill A. Shutemov]

It allows to register multiple memory thresholds and gets notifications
when it crosses.

To register a threshold application need:
- create an eventfd;
- open file memory.usage_in_bytes of a cgroup
- write string "<event_fd> <memory.usage_in_bytes> <threshold>" to
  cgroup.event_control.

Application will be notified through eventfd when memory usage crosses
threshold in any direction.

Signed-off-by: Kirill A. Shutemov <kirill@xxxxxxxxxxxxx>

-- 
1.6.5.3

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