Xen devel - Jan 2010 - Xen domctl scheduler_op question (vcpu_unpause)

hello,

I see that in xen/common/schedule.c , when adjusting scheduling parameters
for a Xen domain, VCPUs of the particular domain are paused and later
unpaused unless it is the current VCPU.
vcpu_unpause internally calls vcpu_wake which temporarily boosts the
priority of the vcpu to CSCHED_PRI_TS_BOOST (Ref: csched_vcpu_wake).

My question is - Does this mean a simple get_credit or set_credit operation
for a domain will also boost its priority ? And if it is so, why is the
boost needed everytime ?

thanks,
Priyanka


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