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

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Message-ID: <559A24DA.7040004@intel.com>
Date:	Mon, 06 Jul 2015 09:48:58 +0300
From:	Adrian Hunter <adrian.hunter@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
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 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?

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