#1980 HIGH CTest: develop should have facilities for better memory footprint reporting.

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#1980: develop should have facilities for better memory footprint reporting.
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 Reporter:  jg                |       Owner:  orospakr
     Type:  defect            |      Status:  new     
 Priority:  high              |   Milestone:  CTest   
Component:  develop-activity  |     Version:          
 Keywords:                    |    Verified:  0       
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 http://kernelnewbies.org/Linux_2_6_22#head-
 b8a3a2eee0cd6ebd97e500bdcd941f08a24e622d

 To quote:

 2.6.22 adds a "Referenced" line to each VMA in /proc/pid/smaps, which
 indicates how many pages within it are currently marked as referenced or
 accessed. There's also a new /proc/pid/clear_refs file. When any non-zero
 number is written to this clear_refs file, the Reference field is cleared-

 With those mechanism it is now possible to measure approximately how much
 memory a task is using by clearing the reference bits with "echo 1 >
 /proc/pid/clear_refs" and checking the reference count for each VMA from
 the /proc/pid/smaps output at a measured time interval (fe. 1 second).
 This is a valuable tool to get an approximate measurement of the memory
 footprint for a task.

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Ticket URL: <http://dev.laptop.org/ticket/1980>
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