Re: [Xen-users] whether xen scheduler supports preemption

[Dario Faggioli <dario.faggioli@xxxxxxxxxx>]

On mar, 2013-06-25 at 22:29 +0800, åä wrote:
> Hi, all
> 
Hi,

> I want to know whether xen scheduler supports preemption? 
>
Yes, it definitely does.

> If it supports,  in the source code, which part decides it has the
> preemption function? 
> 
All the important bits about Xen scheduling can be found, in the source
code, in the following files:

xen/common/schedule.c
xen/common/sched_credit.c
xen/common/sched_credit2.c
xen/common/sched_sedf.c
xen/common/sched_arinc653.c

Look particularly carefully at schedule.c, which hosts the generic
scheduling frameweork, common to all the scheduling algorithms we
support, and to sched_credit.c, which is where the scheduling algorithm
that is used by default is implemented.

Regarding what you're saying about the "preemption function", I'm sorry,
but I cannot parse that part of the sentence... What do you mean by
"which part decides it has the preemption function"?

Dario

-- 
<<This happens because I choose it to happen!>> (Raistlin Majere)
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Dario Faggioli, Ph.D, http://about.me/dario.faggioli
Senior Software Engineer, Citrix Systems R&D Ltd., Cambridge (UK)

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