linux-kernel - Re: [PATCH v8 1/8] time: Add cycles to nanoseconds translation

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Message-ID: <alpine.DEB.2.11.1602241148590.3670@nanos>
Date:	Wed, 24 Feb 2016 11:49:10 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	"Christopher S. Hall" <christopher.s.hall@...el.com>
cc:	richardcochran@...il.com, mingo@...hat.com, john.stultz@...aro.org,
	hpa@...or.com, jeffrey.t.kirsher@...el.com, x86@...nel.org,
	linux-kernel@...r.kernel.org, intel-wired-lan@...ts.osuosl.org,
	netdev@...r.kernel.org, kevin.b.stanton@...el.com,
	kevin.j.clarke@...el.com
Subject: Re: [PATCH v8 1/8] time: Add cycles to nanoseconds translation

On Mon, 22 Feb 2016, Christopher S. Hall wrote:

> The timekeeping code does not currently provide a way to translate
> externally provided clocksource cycles to system time. The cycle count
> is always provided by the result clocksource read() method internal to
> the timekeeping code. The added function timekeeping_cycles_to_ns()
> calculated a nanosecond value from a cycle count that can be added to
> tk_read_base.base value yielding the current system time. This allows
> clocksource cycle values external to the timekeeping code to provide a
> cycle count that can be transformed to system time.

Reviewed-by: Thomas Gleixner <tglx@...utronix.de>