From: Egan <tony.egan@timesys.com>
To: linuxppc-embedded@ozlabs.org
To: linuxppc-embedded@ozlabs.org
Subject: Re: POSIX High Resolution Timers in LinuxPPC 2.4
Date: Mon, 19 Dec 2005 10:57:54 -0500 [thread overview]
Message-ID: <17318.55426.526781.62414@santa.timesys.com> (raw)
In-Reply-To: <200512191039.58149.david.jander@protonic.nl>
> Hi Tim,
>
> On Friday 16 December 2005 23:34, Martin, Tim wrote:
> > Could someone give me a brief history lesson on POSIX high resolution
> > timers (e.g. timer_create() function) implemented in the Linux kernel on
> > the PowerPC 405 architecture? Specifically:
> >
> > Confirm they are in the mainline 2.6 kernel now (e.g. kernel.org)?
> >
> > Were they ever a part of the "mainline" 2.4 linuxppc kernel (e.g
> > ppc.bkbits.net)?
> >
> > If no, were they ever available as a patch? The stuff at
> > sourceforge.net/projects/high-res-timers stops at 2.4.20 and looks like it
> > was only ever working for i386, not ppc.
>
> I asked a related question a while back, and got no answer (yet).
> I did find this though, which you might have overlooked:
> http://prdownloads.sourceforge.net/high-res-timers/ppc-hrt-2.6.10.patch?download
>
> I am equally puzzled about whether this has made it into mainstream, is about
> to, or never will. I don't even know if it actually works.
>
> Greetings,
>
> --
>
> David Jander
> Protonic Holland.
>
High resolution timer support has been rewritten for 2.6 by Thomas Gleixner
with help from Ingo Molnar and others and is available at:
http://tglx.de/hrtimers.html. It is also integrated into Ingo's
realtime-preempt patch at: http://people.redhat.com/mingo/realtime-preempt/.
It is not available in the mainline kernel yet. Currently only X86 is
supported, PPC and other architectures are reported to be in progress. If you
monitor the LKML you will see a lot of discussion/development in this area
right now.
Regards,
Tony
next prev parent reply other threads:[~2005-12-19 16:53 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2005-12-16 22:34 POSIX High Resolution Timers in LinuxPPC 2.4 Martin, Tim
2005-12-19 9:39 ` David Jander
2005-12-19 15:57 ` Egan [this message]
2005-12-19 22:56 ` Geoff Levand
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