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

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Message-ID: <1311958962.5890.416.camel@twins>
Date:	Fri, 29 Jul 2011 19:02:42 +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 Fri, 2011-07-29 at 18:58 +0200, Peter Zijlstra wrote:
> 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.

Hmm, I might have mis-understood, is that exactly what this patch
implements, or does this patch add support for new hardware?


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