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Stripping the original Fedora bug content since it's a bit long, but please see it at bug 426968

Anyway, the current culprit is:

  22.2% (108.4)      npviewer.bin : hrtimer_start_range_ns (hrtimer_wakeup)

nspluginwrapper-1.3.0-12.el6.x86_64
nspluginwrapper-1.3.0-12.el6.i686

This request was evaluated by Red Hat Product Management for inclusion in a Red
Hat Enterprise Linux major release.  Product Management has requested further
review of this request by Red Hat Engineering, for potential inclusion in a Red
Hat Enterprise Linux Major release.  This request is not yet committed for
inclusion.

hrtimer_start_range_ns does not come from nspluginwrapper, see:

http://www.linuxquestions.org/questions/slackware-14/powertop-shows-enormous-activity-hrtimer_start_range_ns-783301/