perf/x86: Implement 64-bit counter support for IBS
This patch implements 64 bit counter support for IBS. The sampling period is no longer limited to the hw counter width. The functions perf_event_set_period() and perf_event_try_update() can be used as generic functions. They can replace similar code that is duplicate across architectures. Signed-off-by: NRobert Richter <robert.richter@amd.com> Acked-by: NPeter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Link: http://lkml.kernel.org/r/1323968199-9326-5-git-send-email-robert.richter@amd.comSigned-off-by: NIngo Molnar <mingo@elte.hu>
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