linux-kernel - Re: [PATCH RFC] x86, tsc: Allow for high latency in quick_pit

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Message-ID: <alpine.DEB.2.11.1507060941190.3916@nanos>
Date:	Mon, 6 Jul 2015 09:42:18 +0200 (CEST)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Adrian Hunter <adrian.hunter@...el.com>
cc:	Andi Kleen <ak@...ux.intel.com>,
	Andy Lutomirski <luto@...capital.net>,
	LKML <linux-kernel@...r.kernel.org>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	X86 ML <x86@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
	Len Brown <lenb@...nel.org>,
	George Spelvin <linux@...izon.com>,
	Ingo Molnar <mingo@...nel.org>, a.p.zijlstra@...llo.nl,
	arjan@...radead.org, bp@...en8.de, penberg@....fi,
	akpm@...ux-foundation.org
Subject: Re: [PATCH RFC] x86, tsc: Allow for high latency in
 quick_pit_calibrate()

On Mon, 6 Jul 2015, Adrian Hunter wrote:

> On 22/06/15 16:14, Thomas Gleixner wrote:
> > On Mon, 22 Jun 2015, Adrian Hunter wrote:
> >> On 03/06/15 19:23, Thomas Gleixner wrote:
> >>> On Wed, 3 Jun 2015, Adrian Hunter wrote:
> >>>
> >>>> On 03/06/15 06:30, Andi Kleen wrote:
> >>>>>> Then the changelog should say that I think.  The current text says
> >>>>>> "Fast TSC calibration will always fail", which, to me, suggests that
> >>>>>> either the slow calibration will work or that the changelog message
> >>>>>> should be changed.
> >>>>>
> >>>>> Ok. No, the slow calibration works I believe.
> >>>>
> >>>> Yeah, so the (only?) downside is the 50ms wasted on Fast TSC
> >>>> calibration.  What about this?
> >>>
> >>> I'm certainly happy to apply this one. 
> >>
> >> George Spelvin began investigating improving quick_pit_calibrate() but Ingo
> >> anyway suggested this patch as the first, so can this be applied?
> > 
> > Oh, yes. I simply forgot to pick it up. Thanks for the reminder.
> 
> Sorry to bother you, but I don't still don't see the patch anywhere?

That patch seems to be highly merge resistant. It's queued now.

Thanks,

	tglx
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