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[Xen-devel] Xen domctl scheduler_op question (vcpu_unpause)

from [Priyanka Tembey] [Permanent Link][Original]

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Subject:	[Xen-devel] Xen domctl scheduler_op question (vcpu_unpause)
From:	Priyanka Tembey <tembey.priyanka@xxxxxxxxx>
Date:	Sat, 2 Jan 2010 15:37:26 -0500
Delivery-date:	2010年1月04日 05:08:39 -0800
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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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[Xen-devel] Xen domctl scheduler_op question (vcpu_unpause)