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SubjectRe: [PATCH] Convert alpha to use arch_gettimeoffset()
john stultz wrote:
> On Fri, 2009-06-12 at 00:03 -0700, Richard Henderson wrote:
>
>> john stultz wrote:
>>
>>> I suspect the alpha arch could even be further improved to provide and
>>> rpcc() based clocksource, but not having the hardware, I don't feel
>>> comfortable attempting the more complicated conversion (but I'd be glad
>>> to help if anyone else is interested).
>>>
>> Unfortunately this isn't possible. The rpcc value is only 32-bits wide,
>> and so rolls over in approx 3 to 4 seconds. Thus all the contortions to
>> try and use the truncated value for sub 1 second adjustments.
>>
>
> That's actually ok. The ACPI PM clocksource on x86 is only 24 bits wide
> and wraps every 5 seconds. The generic timekeeping code handles the
> wrapping and accumulation for you.
>
Interesting.
> Might you create a patch that does this conversion and apply it on top
> of mine?
Unfortunately I don't have working hardware anymore. Perhaps Ivan will
be able to help here.


r~


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