[ltt-dev] UST: PowerPC 32 port of now in git

[Pierre-Marc Fournier]

On 04/20/2010 08:27 PM, Josh Boyer wrote:
> On Tue, Apr 20, 2010 at 02:45:36PM -0400, Pierre-Marc Fournier wrote:
>> Mathieu Desnoyers wrote:
>>> * Pierre-Marc Fournier (pierre-marc.fournier at polymtl.ca) wrote:
>>>> Hi,
>>>>
>>>> This is to let you know that the UST in the git repository now
>>>> supports  the PowerPC 32 architecture.
>>>>
>>>> http://git.dorsal.polymtl.ca/?p=ust.git;a=summary
>>>>
>>>> Testing is welcome.
>>>>
>>>> This will be in the next release.
>>>
>>> This port seems to rely on do_gettimeofday. Any plan to add ppc tb
>>> register-based trace clock ?
>>>
>>
>> Hi Mathieu,
>>
>> I did some tests. On my ppc32 system, this counter wraps in about 2
>> minutes. Will LTTV tolerate well a wrapping time base?
>
> ppc32 timebase is two separate registers, timebase upper and lower.  I could
> certainly see the lower register (lower 32 bits) wrapping in about 2 min, but
> the upper should continue on.
>

Thanks. Indeed there was a problem in my quick test implementation. ;-) 
I pushed the code to the repo. To activate the "native" time source, one 
must comment the
#define TRACE_CLOCK_GENERIC
line in clock.h.

For now there is no trace_clock_frequency() function for this time 
source so it is disabled by default.

pmf