Re: [Xen-devel] [PATCH for 4.7 4/4] xen: adopt .deinit_pdata and improve timer handling

[Meng Xu <mengxu@xxxxxxxxxxxxx>]

On Sat, May 7, 2016 at 5:19 PM, Meng Xu <mengxu@xxxxxxxxxxxxx> wrote:
> On Tue, May 3, 2016 at 5:46 PM, Dario Faggioli
> <dario.faggioli@xxxxxxxxxx> wrote:
>>
>> The scheduling hooks API is now used properly, and no
>> initialization or de-initialization happen in
>> alloc/free_pdata any longer.
>>
>> In fact, just like it is for Credit2, there is no real
>> need for implementing alloc_pdata and free_pdata.
>>
>> This also made it possible to improve the replenishment
>> timer handling logic, such that now the timer is always
>> kept on one of the pCPU of the scheduler it's servicing.
>> Before this commit, in fact, even if the pCPU where the
>> timer happened to be initialized at creation time was
>> moved to another cpupool, the timer stayed there,
>> potentially inferfearing with the new scheduler of the
>> pCPU itself.
>>
>> Signed-off-by: Dario Faggioli <dario.faggioli@xxxxxxxxxx>
>> --
>
> Reviewed-and-Tested-by: Meng Xu <mengxu@xxxxxxxxxxxxx>

>
> ---Below is the testing scenarios---
> echo "start test case 1..."
> xl cpupool-list
> xl cpupool-destroy cpupool-credit
> xl cpupool-destroy cpupool-credit2
> xl cpupool-destroy cpupool-rtds
> xl cpupool-create ${cpupool_credit_file}
> xl cpupool-create ${cpupool_credit2_file}
> xl cpupool-create ${cpupool_rtds_file}
> # Add cpus to each cpupool
> echo "Add CPUs to each cpupool"
> for ((i=0;i<5; i+=1));do
> xl cpupool-cpu-remove Pool-0 ${i}
> done
> echo "xl cpupool-cpu-add cpupool-credit 0"
> xl cpupool-cpu-add cpupool-credit 0
> echo "xl cpupool-cpu-add cpupool-credit2 1,2"
> xl cpupool-cpu-add cpupool-credit2 1
> xl cpupool-cpu-add cpupool-credit2 2
> echo "xl cpupool-cpu-add cpupool-rtds 3,4"
> xl cpupool-cpu-add cpupool-rtds 3
> xl cpupool-cpu-add cpupool-rtds 4
> xl cpupool-list -c
> xl cpupool-list
> # Migrate vm1 among cpupools
> echo "Migrate ${vm1_name} among cpupools"
> xl cpupool-migrate ${vm1_name} cpupool-rtds
> xl cpupool-migrate ${vm1_name} cpupool-credit2
> xl cpupool-migrate ${vm1_name} cpupool-rtds
> xl cpupool-migrate ${vm1_name} cpupool-credit
> xl cpupool-migrate ${vm1_name} cpupool-rtds
>

I forgot one thing in the previous email.
When I tried to migrate Domain-0 from the Pool-0 (with rtds or credit
scheduler) to another newly created pool, say cpupool-credit, it
always fails.

This situation happens even when I boot into credit scheduler and try
to migrate Domain-0 to another cpupool.

I'm wondering if Domain-0 can be migrated among cpupools?
From the Xen wiki: http://wiki.xenproject.org/wiki/Cpupools_Howto, it
seems Domain-0 can be migrated....

Thanks,

Meng

-----------
Meng Xu
PhD Student in Computer and Information Science
University of Pennsylvania
http://www.cis.upenn.edu/~mengxu/

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