linux-kernel - Re: [PATCH v3]PM/Sleep: Timer quiesce in freeze state

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Message-ID: <2076277.JWdUtd56Il@vostro.rjw.lan>
Date:	Mon, 26 Jan 2015 15:50:21 +0100
From:	"Rafael J. Wysocki" <rjw@...ysocki.net>
To:	Thomas Gleixner <tglx@...utronix.de>
Cc:	"Li, Aubrey" <aubrey.li@...ux.intel.com>,
	Peter Zijlstra <peterz@...radead.org>,
	"Brown, Len" <len.brown@...el.com>,
	"alan@...ux.intel.com" <alan@...ux.intel.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Linux PM list <linux-pm@...r.kernel.org>
Subject: Re: [PATCH v3]PM/Sleep: Timer quiesce in freeze state

On Monday, January 26, 2015 03:24:27 PM Thomas Gleixner wrote:
> On Mon, 26 Jan 2015, Rafael J. Wysocki wrote:
> > On Monday, January 26, 2015 10:40:24 AM Thomas Gleixner wrote:
> > > The only remaining issue might be a NMI calling into
> > > ktime_get_mono_fast_ns() before timekeeping is resumed. Its probably a
> > > non issue on x86/tsc, but it might be a problem on other platforms
> > > which turn off devices, clocks, It's not rocket science to prevent
> > > that.
> > 
> > I don't see any users of ktime_get_mono_fast_ns() at all, unless some non-trivial
> > macros are involved.  At least grepping for it only returns the definition,
> > declarations and the line in trace.c.
> 
> You can trace in NMI and perf is going to use ktime_get_mono_fast_ns()
> eventually as well.

So I'm not sure how to intercept that to be honest.  Any hints?

Rafael

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