[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] Re: [Xen-devel] How to migrate vCPUs based on Credit Scheduler
Adding George, Dario & Anshul Lars > On 3 Apr 2017, at 17:21, 甘清甜 <qingtiangan@xxxxxxxxx> wrote: > > 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 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx https://lists.xen.org/xen-devel
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