Xen devel - Jul 2008 - Hypercall tracing in Xen Linux box

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 .
      
Thanks,
Viswa


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On Wed, Jul 9, 2008 at 3:30 PM, Viswanath Thangamuthu
<viswa_thangam@oneindia.in> 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?

Thanks,
Jun

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> ----- Original Message -----
> From: "Jun Koi" <junkoi2004@gmail.com>
> To: "Viswanath Thangamuthu" <viswa_thangam@oneindia.in>
> 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@oneindia.in> 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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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?

Thanks in Advance
> ----- Original Message -----
> From: "Viswanath Thangamuthu" <viswa_thangam@oneindia.in>
> To: "Jun Koi" <junkoi2004@gmail.com>
> 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@gmail.com>
> > To: "Viswanath Thangamuthu"
<viswa_thangam@oneindia.in>
> > 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@oneindia.in> 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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> _______________________________________________
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> Xen-devel@lists.xensource.com
> http://lists.xensource.com/xen-devel
>


Regards,
Viswa


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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@oneindia.in>
> > To: "Jun Koi" <junkoi2004@gmail.com>
> > 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@gmail.com>
> > > To: "Viswanath Thangamuthu"
<viswa_thangam@oneindia.in>
> > > 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@oneindia.in> 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
> >
> > --
> > _______________________________________________
> > Visitor Medical Insurance for visitors to USA from
> > http://www.buyamericaninsurance.com/?affiliateid=oneindia
> >
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel
>
> Regards,
> Viswa


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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@oneindia.in>
> > To: "Jun Koi" <junkoi2004@gmail.com>
> > 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@gmail.com>
> > > To: "Viswanath Thangamuthu"
<viswa_thangam@oneindia.in>
> > > 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@oneindia.in> 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
> > 
> > >
> > 
> > 
> > 
> > --
> > _______________________________________________
> > Visitor Medical Insurance for visitors to USA from 
> > http://www.buyamericaninsurance.com/?affiliateid=oneindia
> > 
> > _______________________________________________
> > Xen-devel mailing list
> > Xen-devel@lists.xensource.com
> > http://lists.xensource.com/xen-devel
> 
> >
> 
> 
> 
> Regards,
> Viswa
> 
> 

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