Re: [Xen-users] Re: [Xen-devel] Hypercall tracing in Xen Linux box

[Mark Williamson <mark.williamson@xxxxxxxxxxxx>]

On Wednesday 16 July 2008, Viswanath Thangamuthu wrote:
> All xm tool command internally invoke hypercalls?
>
> To find out what are all the hypercalls will be invoked when  i used xm
> tools ( xm list,xm create ....etc), I just included "printk" message in all
> the hypercall functions and executed xm list, xm create command, but there
> was no printk message in "/var/log/messages" and dmesg output.  Any idea
> pls?

Have you looked in "xm dmesg", which contains hypervisor output?

Also, not all xm commands necessarily cause hypercalls to be invoked.  xm just 
talks to Xend and Xend does the hypercalls.  For some operations Xend doesn't 
need to do any hypercalls and can return to xm directly.  Just so you know...

Cheers,
Mark

> Thanks in Advance
>
> > ----- Original Message -----
> > From: "Viswanath Thangamuthu" <viswa_thangam@xxxxxxxxxxx>
> > To: "Jun Koi" <junkoi2004@xxxxxxxxx>
> > Subject: Re: [Xen-devel] Hypercall tracing in Xen Linux box
> > Date: Wed, 9 Jul 2008 11:01:29 +0230
> >
> > > ----- Original Message -----
> > > From: "Jun Koi" <junkoi2004@xxxxxxxxx>
> > > To: "Viswanath Thangamuthu" <viswa_thangam@xxxxxxxxxxx>
> > > Subject: Re: [Xen-devel] Hypercall tracing in Xen Linux box
> > > Date: Wed, 9 Jul 2008 16:33:26 +0900
> > >
> > >
> > > On Wed, Jul 9, 2008 at 3:30 PM, Viswanath Thangamuthu
> > >
> > > <viswa_thangam@xxxxxxxxxxx> wrote:
> > > > Hi,
> > > >       Is there a way to find out which hypercall will be
> > >
> > > invoked > when  xm tools are used. For example, if we execute "xm
> > > list" > what would be the hypercall will be invoked? . I am
> > > looking for a > Linux tool in the user space which gives the
> > > similar behaviour > and output as DTRACE in solaris  >
> > > http://blogs.sun.com/michaelh/entry/xvm_server_dtrace_fma .
> > >
> > > Sounds interesting, but what is good about that? I mean why do you
> > > want to know which hypercalls are invoked? Debugging or something
> > > else?
> >
> > Mainly for debugging.
> > Is there any xen tool/documentation which provides all these details?.
> >
> > > Thanks,
> > > Jun
> >
> > --
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>
> Regards,
> Viswa



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