linux-kernel - Re: [patch 12/13] net: mac80211: Remove silly timespec dance

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Message-ID: <alpine.DEB.2.10.1406121017500.5170@nanos>
Date:	Thu, 12 Jun 2014 10:19:08 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Johannes Berg <johannes@...solutions.net>
cc:	LKML <linux-kernel@...r.kernel.org>,
	John Stultz <john.stultz@...aro.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...nel.org>,
	"John W. Linville" <linville@...driver.com>,
	linux-wireless@...r.kernel.org
Subject: Re: [patch 12/13] net: mac80211: Remove silly timespec dance

On Thu, 12 Jun 2014, Johannes Berg wrote:

> On Wed, 2014-06-11 at 23:59 +0000, Thomas Gleixner wrote:
> 
> > +	msrmnt = ktime_to_ms(net_timedelta(skb_arv));
> 
> This is probably more of a question about net_timedelta(), but is
> ktime_get_real() really appropriate for duration measurements? Isn't
> that non-monotonic?

Well, it's monotonic, but might be affected by settimeofday().

Thanks,

	tglx
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