linux-kernel - Re: [PATCH 1/3] clocksource: clean up clocksource

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Message-ID: <51D61FF2.8050302@intel.com>
Date:	Fri, 05 Jul 2013 09:22:58 +0800
From:	Alex Shi <alex.shi@...el.com>
To:	Thomas Gleixner <tglx@...utronix.de>
CC:	hpa@...ux.intel.com, tim.c.chen@...ux.intel.com,
	linux-kernel@...r.kernel.org, andi.kleen@...el.com,
	a.p.zijlstra@...llo.nl, mingo@...e.hu
Subject: Re: [PATCH 1/3] clocksource: clean up clocksource_select

On 07/04/2013 06:27 PM, Thomas Gleixner wrote:
>> > BTW, why we allow user override a second best clocksource? I mean user
>> > can override the tsc with hpet. because undetected unstable tsc?
> The user can decide to override with clocksource=jiffies if he wants
> for testing purposes. That wont switch into highres ever if done from
> the kernel command line. Now we have a sysfs interface, so we need to
> sanity check the user override against highres.
> 
> The override is quite useful to test hpet, pmtimer on a machine which
> would always select TSC.

Got it. thanks a lot for friendly explanation!

-- 
Thanks
    Alex
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