linux-kernel - Re: [PATCH V2 4/4] perf/x86/intel/uncore: SKX support for IIO freerunning counter

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Date:   Fri, 20 Oct 2017 16:15:44 +0200 (CEST)
From:   Thomas Gleixner <tglx@...utronix.de>
To:     Kan Liang <kan.liang@...el.com>
cc:     Peter Zijlstra <peterz@...radead.org>, x86@...nel.org,
        LKML <linux-kernel@...r.kernel.org>, acme@...nel.org,
        eranian@...gle.com, ak@...ux.intel.com
Subject: Re: [PATCH V2 4/4] perf/x86/intel/uncore: SKX support for IIO
 freerunning counter

On Thu, 19 Oct 2017, kan.liang@...el.com wrote:

> As of Skylake Server, there are a number of free-running counters in
> each IIO Box that collect counts for per box IO clocks and per Port
> Input/Output x BW/Utilization.
> 
> Freerunning counters cannot be written by SW. Counting will be suspended
> only when the IIO Box is powered down.

Free running counters are read only and always active when the IIO box is
powered up.

> 
> The bit width of freerunning counter is 36-bit.

Please use 'free running' consistently all over the place.

Thanks,

	tglx