memory.force_empty is deprecated

["Zhao Hui Ding" <dingzhh@cn.ibm.com>]

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Hello,

I'm Zhaohui from IBM Spectrum LSF development team. I got below message 
when running LSF on SUSE11.4, so I would like to share our use scenario 
and ask for the suggestions without using memory.force_empty.

memory.force_empty is deprecated and will be removed. Let us know if it is 
needed in your usecase at linux-mm@kvack.org

LSF is a batch workload scheduler, it uses cgroup to do batch jobs 
resource enforcement and accounting. For each job, LSF creates a cgroup 
directory and put job's PIDs to the cgroup.

When we implement LSF cgroup integration, we found creating a new cgroup 
is much slower than renaming an existing cgroup, it's about hundreds of 
milliseconds vs less than 10 milliseconds.
To speed up job clean up, when a job is done, LSF doesn't delete the 
cgroup, instead, LSF reset the memory usage by setting memory.force_empty 
to "0". The subsequent job will rename the cgroup name and reuse it.

If memory.force_empty will be removed, how to achieve the same goal?

Looking forward for you reply.

Thanks & Regards,

Zhaohui Ding (丁肇辉), Ph.D
Senior Product Architect, IBM Platform LSF Product Line
IBM China Systems and Technology Laboratory in Beijing
Addr: Building 28, ZhongGuanCun Software Park, No.8 Dong Bei Wang West 
Road
Office : (86-10) 82450903   Mobile : (86) 186-1198-2179


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