* POSIX High Resolution Timers in LinuxPPC 2.4
@ 2005-12-16 22:34 Martin, Tim
2005-12-19 9:39 ` David Jander
0 siblings, 1 reply; 4+ messages in thread
From: Martin, Tim @ 2005-12-16 22:34 UTC (permalink / raw)
To: linuxppc-embedded
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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.
Tim
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^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: POSIX High Resolution Timers in LinuxPPC 2.4
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
2005-12-19 22:56 ` Geoff Levand
0 siblings, 2 replies; 4+ messages in thread
From: David Jander @ 2005-12-19 9:39 UTC (permalink / raw)
To: linuxppc-embedded; +Cc: Martin, Tim
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.
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: POSIX High Resolution Timers in LinuxPPC 2.4
2005-12-19 9:39 ` David Jander
@ 2005-12-19 15:57 ` Egan
2005-12-19 22:56 ` Geoff Levand
1 sibling, 0 replies; 4+ messages in thread
From: Egan @ 2005-12-19 15:57 UTC (permalink / raw)
To: linuxppc-embedded, linuxppc-embedded
> 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
^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: POSIX High Resolution Timers in LinuxPPC 2.4
2005-12-19 9:39 ` David Jander
2005-12-19 15:57 ` Egan
@ 2005-12-19 22:56 ` Geoff Levand
1 sibling, 0 replies; 4+ messages in thread
From: Geoff Levand @ 2005-12-19 22:56 UTC (permalink / raw)
To: David Jander; +Cc: Martin, Tim, linuxppc-embedded
David Jander wrote:
> 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.
>
You would do better to inquire on the HRT mailing list:
http://lists.sourceforge.net/lists/listinfo/high-res-timers-discourse
HRT support (from http://sourceforge.net/projects/high-res-timers/) was
never accepted to mainline. It works on Ebony (PPC440), but I guess it
is OK on others since it uses the PPC time base. I recommend you get
the latest from CVS, which is against 2.6.12. Older versions have
CVS tags.
-Geoff
^ permalink raw reply [flat|nested] 4+ messages in thread
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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
2005-12-19 22:56 ` Geoff Levand
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