Re: [Xen-ia64-devel] [PATCH] [RESEND] domU destroy & page ref counter

[Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>]

Hi Anthony,

Thanks for your comments.

Xu, Anthony wrote:
>This patch is really good, community has been waiting domain destroy patch for 
>a long time.
>
>Is it appropriate time to flush vhpt and machine tlb when destroying domain?
>I have below concerns,

In fact, I have concerns same as you.

>1. This may counteract the benefit of rid partition. In my mind these flushes 
>are done only when rid reuse happens when allocating rid for a new domain.

As for this patch, page faults occurs in living domains to flush all VHPT 
and all TBL. That is I think that performance of living domains becomes bad 
temporarily. However, I thought that a serious problem did not occur so that 
entries was inserted in VHPT and TLB again.
Because xen/ia64 was not able to destroy a domain for a long time, I made 
this patch to be able to destroy a domain as possible simply.
I think that I have to remake an allocation logic of RID to take the benefit 
of RID partition. I think that this remaking is assignment given me.

Best regards,
 Kan

>2. When migration is enabled, VMM may need to flush vhpt and TC in all 
>processors.
>
>Thanks,
>-Anthony 
>
>>-----Original Message-----
>>From: xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx
>>[mailto:xen-ia64-devel-bounces@xxxxxxxxxxxxxxxxxxx] On Behalf Of Masaki Kanno
>>Sent: 2006定3埖10晩 9:38
>>To: xen-ia64-devel@xxxxxxxxxxxxxxxxxxx
>>Subject: [Xen-ia64-devel] [PATCH] [RESEND] domU destroy & page ref counter
>>
>>Hi,
>>
>>We resend these patches. We made these patches to the latest changeset:9161,
>>and reflected comments.
>>We tested the creation and the destruction of domU repeatedly 100 times.
>>As a result, there was not the memory which was not freed in xen/ia64.
>>Please apply these patches to the xen-ia64-unstable tree.
>>
>>Signed-off-by: Akio Takebe <takebe_akio@xxxxxxxxxxxxxx>
>>Signed-off-by: Masaki Kanno <kanno.masaki@xxxxxxxxxxxxxx>
>>
>>Best regards,
>> Kan, and Fujitsu team
>
>


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