[Xen-devel] The idle time of the physical cpu in xen kernel

[Bei Guan <gbtju85@xxxxxxxxx>]

Hi,

I have a question about the method get_cpu_idle_time() in xen/common/schedule.c. The implementation of this method is attached. I don't understand why the idle time of a pcpu is the RUNSTATE_running time of a vcpu?

I'm looking forward to your reply. Thanks a lot for your help.

176 uint64_t get_cpu_idle_time(unsigned int cpu)

177 {

178 struct vcpu_runstate_info state = { 0 };

179 struct vcpu *v = idle_vcpu[cpu];

180

181 if ( cpu_online(cpu) && v )

182 vcpu_runstate_get(v, &state);

183

184 return state.time[RUNSTATE_running];

185 }

Also see http://xenbits.xensource.com/hg/xen-unstable.hg/file/7a69d32bc8d0/xen/common/schedule.c

--
Best Regards,

Bei

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