Modifying xentop

Modifying xentop

[Carlo Bertoldi]

Hi,
  I'd like to extend xentop, so after some study I realized that I have 
to start extending libxenstat. Let's say I want to know how many 
free_pages a domain has, so I added a field in xen_sysctl_physinfo 
(include/xen/interface/sysctl.h) and one in xen_domctl_getdomaininfo 
(include/xen/interface/domctl.h). CIIW, I think the flow is like: 
libxenstat -> libxc -> xc_physinfo -> ? I think that here I've got to 
check the kernel side interface in drivers/xen/privcmd/privcmd.c but I 
can't find anything that takes care of handling some physinfo struct.
Am I completely off road here? Do I have to look into the hypervisor 
instead of the guest kernel?
Thanks,
  Carlo

-- 
È molto più bello sapere qualcosa di tutto, che sapere tutto di una cosa.

Blaise Pascal

Re: Modifying xentop

[Atsushi SAKAI]

Hi, Carlo

  If you skip the code tracking,
it is better to see arch_do_sysctl@xen/arch/x86/sysctl.c
(XEN_SYSCTL_physinfo).

P.S.
If you keep digging the code in your way,
you need to track the hypercall code (which includes assembler).

Thanks
Atsushi SAKAI



Carlo Bertoldi <mcbain@tiscali.it> wrote:

> Hi,
>   I'd like to extend xentop, so after some study I realized that I have 
> to start extending libxenstat. Let's say I want to know how many 
> free_pages a domain has, so I added a field in xen_sysctl_physinfo 
> (include/xen/interface/sysctl.h) and one in xen_domctl_getdomaininfo 
> (include/xen/interface/domctl.h). CIIW, I think the flow is like: 
> libxenstat -> libxc -> xc_physinfo -> ? I think that here I've got to 
> check the kernel side interface in drivers/xen/privcmd/privcmd.c but I 
> can't find anything that takes care of handling some physinfo struct.
> Am I completely off road here? Do I have to look into the hypervisor 
> instead of the guest kernel?
> Thanks,
>   Carlo
> 
> -- 
> ネ molto pi
\xBE 
\xBE 滝瘟黼 倚黹瘡
\xBE 
\xBE 烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝烝\xDF
\xBE 懊遶粤洹\xEC 轣蛹蜴\xE7 跚齡
\xBE 懊遶粤洹貔跚齡鶤皪銖阨鱆絎竢\xED
\xBE 蔗捥痕妒蜩揭咜緕齒𣗄竇勉闕媞緕℡纐繻