linux-kernel - Re: [PATCH v4 1/4] Produce system time from correlated clocksource

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Message-ID: <alpine.DEB.2.11.1510151007070.3960@nanos>
Date:	Thu, 15 Oct 2015 10:13:36 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Richard Cochran <richardcochran@...il.com>
cc:	Christopher Hall <christopher.s.hall@...el.com>,
	jeffrey.t.kirsher@...el.com, hpa@...or.com, mingo@...hat.com,
	john.stultz@...aro.org, peterz@...radead.org, x86@...nel.org,
	intel-wired-lan@...ts.osuosl.org, netdev@...r.kernel.org,
	linux-kernel@...r.kernel.org, kevin.b.stanton@...el.com
Subject: Re: [PATCH v4 1/4] Produce system time from correlated clocksource

On Thu, 15 Oct 2015, Richard Cochran wrote:
> Thomas seems to say that there are *other* applications that will want
> to transform device time into system time, but why does your audio
> application use the system time, when the audio-to-ptp time is
> directly available, without any man in the middle?

PTP time is slow to access. Having a correlation to system time makes
a log of things simpler; nanosleep is the most obvious example.

Thanks,

	tglx
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