linux-kernel - Re: [PATCH v3] kselftest: timers: Add adjtick test to validate adjtimex() tick adjustments

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Message-ID: <20151003074733.GB25143@gmail.com>
Date:	Sat, 3 Oct 2015 09:47:33 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	John Stultz <john.stultz@...aro.org>
Cc:	linux-kernel@...r.kernel.org,
	Nuno Gonçalves <nunojpg@...il.com>,
	Miroslav Lichvar <mlichvar@...hat.com>,
	Prarit Bhargava <prarit@...hat.com>,
	Richard Cochran <richardcochran@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	Shuah Khan <shuahkh@....samsung.com>
Subject: Re: [PATCH v3] kselftest: timers: Add adjtick test to validate
 adjtimex() tick adjustments


* John Stultz <john.stultz@...aro.org> wrote:

> Recently an issue was reported that was difficult to detect except
> by tweaking the adjtimex tick value, and noticing how quickly the
> adjustment took to be made:
> 	https://lkml.org/lkml/2015/9/1/488
> 
> Thus this patch introduces a new test which manipulates the adjtimex
> tick value and validates the results are what we expect.

So I tried to run this:

triton:~/tip/tools/testing/selftests/timers> ./adjtick 
systick: 10000
Estimating tick (act: 9000 usec, -100000 ppm): 10000 usec, 1 ppmWARNING: Unexpected adjtimex return values, make sure ntpd is not running. triton:~/tip/tools/testing/selftests/timers> 

note the weird placement of the warning, and there's also no newline at the end.

It would also be nice to print out roughly how long the test will take - since it 
runs longer than 1-2 seconds.

Thanks,

	Ingo
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