我们在CPU空闲时,对某些能耗较高的CPU进行隔离,不让task在选核时选择被隔离的CPU,使其尽快进入idle状态,而在需要CPU能力的时候,只需要放开CPU隔离即可让CPU正常参与调度。CPU isolation实际上最终只是通过cpumask设置了cpu_isolated_mask的值,如图4。 core control通过实时监控当前CPU的loading来进行判断当前CPU是否需要...
->sched_init_domains() 传入的cpu_map是cpu_active_mask,即活动状态的cpu,建立调度域: /* Current sched domains: */staticcpumask_var_t*doms_cur;/* Number of sched domains in 'doms_cur': */staticintndoms_cur; /* * Set up scheduler domains and groups. For now this just excludes isolate...
我们在CPU空闲时,对某些能耗较高的CPU进行隔离,不让task在选核时选择被隔离的CPU,使其尽快进入idle状态,而在需要CPU能力的时候,只需要放开CPU隔离即可让CPU正常参与调度。CPU isolation实际上最终只是通过cpumask设置了cpu_isolated_mask的值,如图4。 图4 CPU isolation方法 core control通过实时监控当前CPU的loading来...
* For now this just excludes isolated cpus, but could be used to * exclude other special cases in the future. */ static int init_sched_domains(const struct cpumask *cpu_map) { int err; /*ARM没有定义*/ arch_update_cpu_topology(); ndoms_cur = 1; /*分配一个cpumask结构体变量*/...
即active cpu + idle cpu * cpu_active_mask - has bit 'cpu' set iff cpu available to migration //处于active的cpu,区别与idle cpu * cpu_isolated_mask- has bit 'cpu' set iff cpu isolated //处于isolate的cpu,隔离的cpu不会被分配task运行,但是没有下电 * 1、如果没有CONFIG_HOTPLUG_CPU,那么...
cpumask_var_t real_cpus; /* Related and present */ unsigned int cpu; /* cpu managing this policy, must be online */ struct cpufreq_cpuinfo cpuinfo;/* see above */ unsigned int min; /* in kHz */ unsigned int max; /* in kHz */ ...
cpumask_subset(task_rq(p)->rd->span, new_mask)) { retval = -EBUSY; rcu_read_unlock(); goto out_free_new_mask; } rcu_read_unlock(); } #endif again: cpumask_andnot(&allowed_mask, new_mask, cpu_isolated_mask); //从上面得到的new_mask中,过滤掉isolate的cpu,结果保存在allowed_mask...
Because process accounting in IIS uses Windows Job Objects to monitor CPU times for an entire process, process accounting will log and throttle only applications that are isolated in a separate process from IIS. Process throttling and process accounting are independently controlled by several other met...
Theisolcpusboot option can be used to isolate one or more CPUs at boot time, so that no processes are scheduled onto those CPUs. Following the use of this boot option, the only way to schedule processes onto the isolated CPUs is viasched_setaffinity() or thecpuset(7) mechanism. For furth...
Because process accounting in IIS uses Windows Job Objects to monitor CPU times for an entire process, process accounting will log and throttle only applications that are isolated in a separate process from IIS. Process throttling and accounting are independently controlled by several other metabase pr...