linux-kernel - Re: [PATCH v0 2/3] perf/x86/intel/pt: Export cpu frequency ratios needed by PT decoders

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Message-ID: <20160503135336.GF27540@pd.tnic>
Date:	Tue, 3 May 2016 15:53:36 +0200
From:	Borislav Petkov <bp@...en8.de>
To:	Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
	Ingo Molnar <mingo@...hat.com>, linux-kernel@...r.kernel.org,
	vince@...ter.net, eranian@...gle.com,
	Arnaldo Carvalho de Melo <acme@...radead.org>,
	Mathieu Poirier <mathieu.poirier@...aro.org>
Subject: Re: [PATCH v0 2/3] perf/x86/intel/pt: Export cpu frequency ratios
 needed by PT decoders

On Thu, Apr 28, 2016 at 06:35:45PM +0300, Alexander Shishkin wrote:
> In order for Intel PT decoders to infer correct crystal clock and bus
> frequencies that are required to correctly decode timing information
> from a PT stream (MTC and CBR packets), export them as sysfs attributes:
> 
>   * max_nonturbo_ratio: ratio between the invariant TSC and base clock;
>   * tsc_art_ratio: TSC to core crystal clock ratio.

I guess new sysfs nodes need to be documented:

Documentation/ABI/...

-- 
Regards/Gruss,
    Boris.

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