Re: [Xen-devel] [PATCH] Xenoprof: Enabling performance profiling in Xen

[Andrew Theurer <habanero@xxxxxxxxxx>]

On Friday 08 April 2005 22:10, Santos, Jose Renato G (Jose Renato 
Santos) wrote:
>   I am posting patches for xenoprof in the next three messages
>   (one patch file in each message).
>
>   These patches enable system-wide statistical profiling
>   in Xen environments. Xenoprof was developed at HP Labs by
>   modifying and extending the original OProfile code for linux
>
>  The 3 patch files are:
>
>   1) xenoprof-1.0-xen-2.0.5.patch:
>       - Patch for Xen
>   2) xenoprof-1.0-xenolinux-2.6.10.patch
>       - Patch for the linux sparse tree in Xen source tree (2.6.10)
>   3) xenoprof-1.0-oprofile-0.8.1
>       - Patch for Oprofile 0.8.1
>
>   The attached file provides an overview of Xenoprof
>   and how to use it.

Thanks very much; this will come in very handy.  A few questions:

1) When should the --xen option be specified?  My quick testing shows 
that only when combining with the --start option does opcontrol process 
the --xen option fully.  For example, running "opcontrol --vmlinux=yyy 
--xen=zzz; opcontrol --start" does not work, but "opcontrol 
--vmlinux=xxx; opcontrol --start --xen=zzz" does work for me. 

2) So far I have been able to profile domain0 (running SDET) with 
nothing else running, but I can't seem to account for another domain 
running at the same time.  For example, I create a domU (dom id 1) 
running a cpu bound task, I start oprofile with --passive-domains=1, 
but I do not get any ticks representing time spent in dom1 (all I want 
is coarse grain here).  In the sequence of commands to start oprofile, 
is there a particular invocation of opcontrol to specify the 
--passive-domains option?  So far I have been doing "oprofile 
--vmlinux=xxx; oprofile --start --xen=zzz --passive-domains=1"

3) So far I cannot get an samples in domains other than domain0.  Most 
likely user error here.  Can a domU be an initiator?  For example, if I 
have two domains, dom0 and dom1, can dom1 do "everything" while leaving 
dom0 totally uninvolved?

Thanks very much!

-Andrew Theurer

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