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Re: sched_fair: vruntime and min_vruntime will be overflow?
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KOSAKI Motohiro
Mar 5, 2010, 2:30:03 AM3/5/10
to
> hi,
>
> when enqueue or dequeue the task, the se->vruntime and cfs_rq->min_vruntime will
> increased, i want to know it is will be overflow in future time?
>
> when enqueue or dequeue the task, the se->vruntime and cfs_rq->min_vruntime will
> increased, i want to know it is will be overflow in future time?
Let's quick calculation.
type of vruntime is u64.
1 year = 365 x 24 x 60 x 60 x 1000 x 1000 x 1000 nanosec
~= 3 x 10^16
~= 2^55
2^64 / 2^55 = 2^9 ~= 500 year.
then, 500 years after you can see overflow if you still live. :)
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