SRU Justification

Impact: Low memory platforms suffer OOM crashes because of memory
exhaustion

Patch Description: Read the initial value of buffer_size_kb and restore
on exit.

Patch: attached

This patch has been reported by Bryan Wu to have fixed an issue on an ARM OEM 
platform.
This bug cause some real issues on low memory ARM platforms.

** Also affects: ureadahead (Ubuntu Lucid)
   Importance: Undecided
       Status: New

** Also affects: ureadahead (Ubuntu Maverick)
   Importance: High
       Status: Triaged

** Changed in: ureadahead (Ubuntu Lucid)
   Importance: Undecided => High

** Changed in: ureadahead (Ubuntu Lucid)
       Status: New => In Progress

** Changed in: ureadahead (Ubuntu Lucid)
    Milestone: None => ubuntu-10.04.1

** Changed in: ureadahead (Ubuntu Lucid)
     Assignee: (unassigned) => Tim Gardner (timg-tpi)

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Kernel trace buffer should be cleared and size restored after profiling
https://bugs.launchpad.net/bugs/501715
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