Now that our measurement intervals are small (~1ms) we can amortize the posting
of update_shares() to be about each period overflow.  This is a large cost
saving for frequently switching tasks.
Signed-off-by: NPaul Turner <pjt@google.com>
Reviewed-by: NBen Segall <bsegall@google.com>
Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/20120823141507.200772172@google.comSigned-off-by: NIngo Molnar <mingo@kernel.org>