[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] How to migrate vCPUs based on Credit Scheduler
Hi, I'm now designing new vCPU scheduler in Xen, and trying to implement the scheduler based on the Credit scheduler in Xen-4.5.1. But I encountered come problems when debuging the code. Most of the code modification is done in function csched_schedule() in file: xen/common/csched_schedule.c . And the core code is as followed: if( vcpu_runnable(current) ) { if( match the migration contition ) { cpu_affinity = pick_pcpu_runq(); // this function is defined by myself pcpulock = pcpu_schedule_lock_irqsave(cpu_affinity, &pcpulock_flag); TRACE_3D(TRC_CSCHED_STOLEN_VCPU, cpu_affinity , domain_id, vcpu_id); SCHED_VCPU_STAT_CRANK(scurr, migrate_q); SCHED_STAT_CRANK(migrate_queued); WARN_ON(scurr->vcpu->is_urgent); scurr->vcpu->processor = cpu_affinity; __runq_insert(cpu_affinity, scurr); pcpu_schedule_unlock_irqrestore(pcpulock, pcpulock_flag, cpu_affinity ); } else __runq_insert(cpu, scurr); } else BUG_ON( is_idle_vcpu(current) || list_empty(runq) ); I try to run the modified Xen. But according to the log I found that, although I insert the vCPU into the runqueue of another pCPU, the vCPU still appears at the old pCPU in the following scheduling period. Now I have a few questions: 1. Does the Xen scheduler framework support changing the pCPU of a vCPU after using out the scheduling time slice, but not just to steal one vCPU from runqueue of other pCPU in load_balance period? 2. If yes, what status of the vCPU should be changed before inserting the vCPU into the destination pCPU? Thank you very much! _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |