sched_fair: vruntime and min_vruntime will be overflow?
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From: figo zhang on 5 Mar 2010 02:20 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? Best, Figo.zhang -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
From: KOSAKI Motohiro on 5 Mar 2010 02:30
> 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? 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. :) -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |