linux-kernel - Re: [PATCH 7/7] perf, x86: Implement 64 bit counter support for IBS

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Message-ID: <1311958728.5890.412.camel@twins>
Date:	Fri, 29 Jul 2011 18:58:48 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	Robert Richter <robert.richter@....com>
Cc:	Ingo Molnar <mingo@...e.hu>,
	Arnaldo Carvalho de Melo <acme@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 7/7] perf, x86: Implement 64 bit counter support for IBS

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.
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