On 06/16/2011 12:44 AM, Wen Congyang wrote:
> In the kernel, the value of quota is stored in uint64_t:
> =======================================
> struct cfs_bandwidth {
> #ifdef CONFIG_CFS_BANDWIDTH
> raw_spinlock_t lock;
> ktime_t period;
> u64 quota; <========== here is u64, not s64
> u64 runtime;
> u64 runtime_expires;
> s64 hierarchal_quota;
>
> int idle;
> struct hrtimer period_timer, slack_timer;
> struct list_head throttled_cfs_rq;
>
> /* statistics */
> int nr_periods, nr_throttled;
> u64 throttled_time;
>
> #endif
> };
> =======================================
>
> The unit of quota in kernel is ns, but the value we write to cpu.cfs_quota_us is us.
> So the max value we can write is 2^64/1000.
>
> In the kernel, if quota is ~0ULL, it means unlimited.
Ok, I would think you can use the same semantics in libvirt then. No
need for a structure.
--
Adam Litke
IBM Linux Technology Center
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