Make ProcfsBasedProcessTree collect rss memory information
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Key: MAPREDUCE-1167
URL: https://issues.apache.org/jira/browse/MAPREDUCE-1167
Project: Hadoop Map/Reduce
Issue Type: New Feature
Components: tasktracker
Affects Versions: 0.20.1
Reporter: Scott Chen
Right now ProcfsBasedProcess collects only virtual memory. We can make it
collect rss memory as well.
Later we can use rss in TaskMemoryManagerThread to obtain better memory
management.
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