events: Move lockless timer calculation into helper function
Take the timer calculation from perf_output_read and move it to a helper function for any place that needs timer values but cannot take the ctx->lock. Signed-off-by: NEric B Munson <emunson@mgebm.net> Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl> Link: http://lkml.kernel.org/r/1308861279-15216-2-git-send-email-emunson@mgebm.netSigned-off-by: NIngo Molnar <mingo@elte.hu>
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