Re: [libvirt] [PATCH RFC 0/5] support cpu bandwidth in libvirt

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.