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sched/fair: Make CFS bandwidth controller burstable
Accumulate unused quota from previous periods, thus accumulated bandwidth runtime can be used in the following periods. During accumulation, take care of runtime overflow. Previous non-burstable CFS bandwidth controller only assign quota to runtime, that saves a lot. A sysctl parameter sysctl_sched_cfs_bw_burst_onset_percent is introduced to denote how many percent of burst is given on setting cfs bandwidth. By default it is 0, which means on burst is allowed unless accumulated. Also, parameter sysctl_sched_cfs_bw_burst_enabled is introduced as a switch for burst. It is enabled by default. Signed-off-by: Huaixin Chang <changhuaixin@linux.alibaba.com> Signed-off-by: Shanpei Chen <shanpeic@linux.alibaba.com>
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