Trace exec() as well as open()

[Scott James Remnant]

So it turns out that it's helpful to trace exec() as well as open() so
we readahead the things we, err, run.  Following two patches revert my
existing trace events patch and replace it with a better one.


The SRU tracking bug for this is:

Bug #462111: Improve trace events used by readahead

Scott
-- 
Scott James Remnant
scott at ubuntu.com
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