linux-kernel - Re: [PATCH] x86: Calculate MHz using APERF/MPERF for cpuinfo and scaling_cur

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Message-ID: <20160401095005.GA25313@pd.tnic>
Date:	Fri, 1 Apr 2016 11:50:05 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Stephane Gasparini <stephane.gasparini@...ux.intel.com>
Cc:	Peter Zijlstra <peterz@...radead.org>, Len Brown <lenb@...nel.org>,
	x86@...nel.org, linux-pm@...r.kernel.org,
	linux-kernel@...r.kernel.org, Len Brown <len.brown@...el.com>
Subject: Re: [PATCH] x86: Calculate MHz using APERF/MPERF for cpuinfo and
 scaling_cur_freq

On Fri, Apr 01, 2016 at 11:30:48AM +0200, Stephane Gasparini wrote:
> The MSRs will not wrap that often.

Unless some yahoo goes and does WRMSR APERF <big_value_close_to_wrap_around>.

I think we should handle that gracefully too, regardless of how "smart"
that move might be.

-- 
Regards/Gruss,
    Boris.

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