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

[Sandesh <sandesh.ahiremath@xxxxxxxxx>]

On Wed, 2008-07-16 at 08:54 +0230, 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?
> 
use xm dmesg....
the printk's in hypervisor gets stored in the i/o ring buffer, it has to
be explicitly read from the userspace, 

or if you have a console attached to the serial port of your machine
then all the printk's appears on the serial console automatically. For
this you have to give "console=com1,vga com1=115200,8n1" as command line
argument for the hypervisor image "xen.gz"

> 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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