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SubjectRe: Finegrained a/c/mtime was Re: Directory notification problem
Andi Kleen wrote:

>>>Another advantage of using the real time instead of a counter is that
>>>you can easily merge the both values into a single 64bit value and do
>>>arithmetic on it in user space. With a generation counter you would need
>>>to work with number pairs, which is much more complex.
>>>
>>??
>>if (file->mtime != mtime || file->gen_count != gen_count)
>> file_changed=1;
>>
>
>And how would you implement "newer than" and "older than" with a generation
>count that doesn't reset in a always fixed time interval (=requiring
>additional timestamps in kernel)?
>
>-Andi
>
Well IMHO "newer than", "older than" applications have until now
done with second resolution, and that's all that's required?

Padraig.

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