[Devel] Re: [RFC}[PATCH] forced uncharge for successful rmdir.

[Badari Pulavarty]

On Thu, 2007-09-27 at 16:30 +0900, KAMEZAWA Hiroyuki wrote:
> Following patch is for successful rmdir in memory cgroup.
> 
> Currently, rmdir against memory cgroup will fail if charged page caches are in cgroup.
> (even if no tasks in cgroup.)
> 
> I don't like this. This patch implements "forced" uncharge against memory cgroup.
> Uncharged pages will be charged again when some other cgroup/task accesses it.
> 
> I wonder that all unmapped page-caches in cgroup should be uncharged if "1" is written to
> control_type.
> 
> I'm grad if I can hear memory controller's policy about "rmdir" against no-task-cgroup.

Works for me..

elm3b155:/dev/cgroup/xxx # cat tasks
elm3b155:/dev/cgroup/xxx #
elm3b155:/dev/cgroup/xxx # cat memory.usage_in_bytes
16384
elm3b155:/dev/cgroup/xxx # echo -n 0 > memory.control_type
elm3b155:/dev/cgroup/xxx # cat memory.usage_in_bytes
0

Thanks,
Badari



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