Hi, this is third version.
While small changes in codes, the whole _tone_ of code is changed.
I'm not in hurry, any comments are welcome.
based on 2.6.26-rc2-mm1 + memcg patches in -mm queue.
Changes from v2:
- Named as HardWall policy.
- rewrote the code to be read easily. changed the name of functions.
- Added text.
- supported hierarchy_model parameter.
Now, no_hierarchy and hardwall_hierarchy is implemented.
HardWall Policy:
- designed for strict resource isolation under hierarchy.
Usually, automatic load balancing between cgroup can break the
users assumption even if it's implemented very well.
- parent overcommits all children
parent->usage = resource used by itself + resource moved to children.
Of course, parent->limit > parent->usage.
- when child's limit is set, the resouce moves.
- no automatic resource moving between parent <-> child
Example)
1) Assume a cgroup with 1GB limits. (and no tasks belongs to this, now)
- group_A limit=1G,usage=0M.
2) create group B, C under A.
- group A limit=1G, usage=0M
- group B limit=0M, usage=0M.
- group C limit=0M, usage=0M.
3) increase group B's limit to 300M.
- group A limit=1G, usage=300M.
- group B limit=300M, usage=0M.
- group C limit=0M, usage=0M.
4) increase group C's limit to 500M
- group A limit=1G, usage=800M.
- group B limit=300M, usage=0M.
- group C limit=500M, usage=0M.
5) reduce group B's limit to 100M
- group A limit=1G, usage=600M.
- group B limit=100M, usage=0M.
- group C limit=500M, usage=0M.
Thanks,
-Kame
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