Re: [Xen-devel] Performance problem about address translation

[xinyue <xinyue@xxxxxxxxxxxxxxx>]

On 2015å07æ08æ 14:26, xinyue wrote:
> Very sorry for sending wrong before.
> On 2015å07æ08æ 14:13, xinyue wrote:
> > On 2015å07æ07æ 19:49, Ian Campbell wrote:
> > > On Tue, 2015-07-07 at 11:24 +0800, xinyue wrote:
> > >
> > > Please don't use HTML mail and do proper ">" quoting
> > >
> > > > And after analyzing the performance of hvm domu, I found a process
> > > > named "evolution-data-" using almost 99.9% cpu. Does someone known
> > > > what's this and why it appears?
> > > evolution-data-server is part of the evolution mail client. It has
> > > nothing to do with Xen I'm afraid so you will have to look elsewhere 
> > > for
> > > why it is taking so much CPU.
> > >
> > > Ian.
> Sorry for that and thanks very much.
>
> I think the problem maybe caused by the address alignment. The HVM 
> DomU crashed after the hypercall and Dom0 crashed later sometimes with 
> "Bus error".
> I think the function that caused the crash is get_gfn. The related 
> code is
>     unsigned long gfn;
>     unsigned long mfn;
>     struct vcpu *vcpu = current;
>     struct domain *d = vcpu->domain;
>     uint32_t pfec = PFEC_page_present;
>     p2m_type_t t;
>     gfn = paging_gva_to_gfn(current, 0xc0290000, &pfec);
>     mfn = get_gfn(d, gfn, &t);
>
> Is that I lost some type translation?
>
>
> Thanks and best regards!
>
> xinyue

Thanks for all advices, I found the problem appeared because I forget 
adding function put_gfn.
Thanks again and best regards!

xinyue

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