Re: [LTP] When did High-Resolution Timers hit mainline?

[Subrata M. <tos...@gm...>]

Thanks Michael for reminding about the High Resolution Timers. I was
wondering for the test cases for the same, until somebody told me that this
may be available with Thomas.

Thomas,

Do you have those High Resolution Timers test cases available with you,
which you can contribute to LTP (http://ltp.sourceforge.net/) under GPLv2.
Your contribution will be a great value to the Linux test community.

Regards--
Subrata

On Tue, Jun 24, 2008 at 12:05 PM, Michael Kerrisk <
mtk...@go...> wrote:

> Hi Ingo, Thomas,
>
> I want to update some timer and sleep man pages to reflect the arrival
> of high-resolution timers.  However, it's not quite clear to me when
> HRTs properly arrived in mainline.  Was it 2.6.21?  And at that point,
> was the resolution for all timer and sleep calls based on HRTs, so
> that they all became more accurate?  (Or was it the case that various
> system calls switched over to HRTs in different later kernel
> versions?)  Specifically, I'm thinking of the following system calls
>
> nanosleep()
> clock_nanosleep()
> setitimer()
> timer_create()/timer_settime()
>
> Was it the case that pre 2.6.21 (or whatever) these were all
> jiffy-based in their accuracy, and then post 2.6.21, they were all HRT
> based (if CONFIG_HIGH_RES_TIMERS is enabled)?
>
> Cheers,
>
> Michael
> --
> Michael Kerrisk
> Linux man-pages maintainer; http://www.kernel.org/doc/man-pages/
> man-pages <http://www.kernel.org/doc/man-pages/man-pages> online:
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-- 
Regards & Thanks--
Subrata