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Re: [Xen-devel] Cpu pools discussion
- To: Keir Fraser <keir.fraser@xxxxxxxxxxxxx>
- From: Juergen Gross <juergen.gross@xxxxxxxxxxxxxx>
- Date: Wed, 29 Jul 2009 14:33:14 +0200
- Cc: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>, George Dunlap <dunlapg@xxxxxxxxx>, Zhigang Wang <zhigang.x.wang@xxxxxxxxxx>, "xen-devel@xxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxx>
- Delivery-date: Wed, 29 Jul 2009 05:33:39 -0700
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Keir Fraser wrote:
> On 29/07/2009 12:06, "Juergen Gross" <juergen.gross@xxxxxxxxxxxxxx> wrote:
>
>> Would you feel better if I'd try to eliminate the reason for cpupool_borrow?
>> This function is needed only for continue_hypercall_on_cpu outside of the
>> current pool. I think it should be possible to replace those by
>> on_selected_cpus with less impact on the whole system.
>
> Some of the stuff in the continuation handlers cannot be executed in irq
> context. 'Fixing' that would make many of the users ugly and less
> maintainable, so getting borrow/return right is the better answer I think.
The alternative would be a tasklet set up in irq.
And we are speaking of 3 users.
I could try a patch and then we could compare the two solutions. What do you
think?
Juergen
--
Juergen Gross Principal Developer Operating Systems
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