linux-kernel - Re: [PATCH] [POWERPC] Use a sensible default for clock

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Message-ID: <20080205090742.GA11087@linux.vnet.ibm.com>
Date:	Tue, 5 Feb 2008 14:37:42 +0530
From:	Chirag Jog <chirag@...ux.vnet.ibm.com>
To:	Tony Breeds <tony@...eyournoodle.com>
Cc:	Sripathi Kodi <sripathik@...ibm.com>, paulus@...ba.org,
	linux-kernel@...r.kernel.org, linuxppc-dev@...abs.org,
	john stultz <johnstul@...ibm.com>
Subject: Re: [PATCH] [POWERPC] Use a sensible default for clock_getres() in
	the vdso.

* Tony Breeds <tony@...eyournoodle.com> [2008-02-05 16:16:48]:

> On Sun, Jan 27, 2008 at 07:32:59PM +0530, Sripathi Kodi wrote:
> > Hi Paul,
> > 
> > On PPC, I see a disparity between clock_getres implementations in the
> > vdso and syscall. I am using a IBM Openpower hardware and 2.6.24 kernel
> > with CONFIG_HIGH_RES_TIMERS=y. 
> > 
> > clock_getres call for CLOCK_REALTIME returns 1 millisecond. However,
> > when I edit arch/powerpc/kernel/vdso*/gettimeofday.S to force it to use 
> > sys_clock_getres, I get 1 nanosecond resolution. The code in vdso seems
> > to be returning some pre-defined (incorrect) variables.
> > 
> > Could you please let me know the reason for this? Is it something that
> > should be fixed in vdso?
> 
> Can you try the attached patch and see it if works for you?
I tried this patch.
It seems to solve the reported problem and give a 1ns resolution.
Thanks.
 

-- 
Cheers,
Chirag Jog

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