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Subject: Re: [PATCH 7/7] perf, x86: Implement 64 bit counter support for IBS
From: Peter Zijlstra <peterz@infradead.org>
To: Robert Richter <robert.richter@amd.com>
Cc: Ingo Molnar <mingo@elte.hu>, Arnaldo Carvalho de Melo <acme@redhat.com>,
        LKML <linux-kernel@vger.kernel.org>
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Date: Fri, 29 Jul 2011 18:58:48 +0200
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On Thu, 2011-07-28 at 15:46 +0200, Robert Richter wrote:
> This patch implements 64 bit counter support for IBS. The sampling
> period is no longer limited to the hw counter width.

That should never be the case, even for shorter hw counter, in such a
case you should ignore overflows until you reach the programmed period.