Re: Compiling xenoprof

[David Carr <dc@dcarr.org>]

Renato,

I should have been more specific.  The sequence of commands from the
guide that I use is below:

On dom0:
[start guests]
opcontrol --reset

opcontrol --no-vmlinux

xm list
Name                              ID Mem(MiB) VCPUs State  Time(s)
Domain-0                           0      256     1 r-----   242.4
guest_0                           11      128     1 -b----    11.7
guest_1                           12      128     1 -b----    11.8

sudo opcontrol --start-daemon --active-domains=guest_0,guest_1

On each guest:
opcontrol --reset

opcontrol --no-vmlinux

opcontrol --start
Using default event: GLOBAL_POWER_EVENTS:100000:1:1:1
Failed to open profile device: Operation not permitted
Using 2.6+ OProfile kernel interface.
Couldn't start oprofiled.
Check the log file "/var/lib/oprofile/oprofiled.log" and kernel syslog

The above error always occurs when I issue the start command on the
guests...

Thanks,
David Carr

Santos, Jose Renato G wrote:

>David,
>
>You are not able to run oprofile on domU only.
>The current model supported for XenOProfile is system-wide
>profiling, i.e. profiling multiple domains, using the same
>hardware counters. In this model
>Dom0 has to be the coordinator of a profiling session.
>You have to first start oprofile daemon in dom0 indicating which
>domains are participating in the profiling session. Then you
>need to run "opcontrol --start" in each domU, and finally
>start profiling from dom0 (opcontrol --start).
>Look at the user guide in http://xenoprof.sourceforge.net
>for more details
>
>Renato 
>
>  
>
>>>-----Original Message-----
>>>From: David Carr [mailto:dc@dcarr.org] 
>>>Sent: Wednesday, April 05, 2006 9:20 AM
>>>To: Santos, Jose Renato G
>>>Cc: xen-devel@lists.xensource.com
>>>Subject: Re: [Xen-devel] Compiling xenoprof
>>>
>>>Renato,
>>>
>>>Thanks for your reply.  The steps below got the kernels to 
>>>build.  I'm not sure that everything is quite right yet 
>>>though.  I can profile on domain 0 and also run opcontrol 
>>>--reset on the guests.  However running "opcontrol --start" 
>>>on the guests results in:
>>>
>>>Using default event: GLOBAL_POWER_EVENTS:100000:1:1:1 Failed 
>>>to open profile device: Operation not permitted Using 2.6+ 
>>>OProfile kernel interface.
>>>
>>>Couldn't start oprofiled.
>>>Check the log file "/var/lib/oprofile/oprofiled.log" and 
>>>kernel syslog
>>>
>>>It appears that this error is coming daemon/liblegacy/init.c 
>>>or daemon/init.c This error only occurs on the guests (which 
>>>are using the dom0 kernel). 
>>>opcontrol --start suceeds on dom0.
>>>
>>>Any ideas?
>>>
>>>Thanks again,
>>>David Carr
>>>
>>>Install steps:
>>>
>>>In Xen 3.0.0 source directory:
>>>
>>>patch -p1 < xenoprof-2.0-xen-3.0.0.patch patch -p1 < 
>>>xenoprof-2.0-linux-2.6-sparse.patch
>>>make kernels
>>>
>>>This will ultimately fail. Then do:
>>>
>>>In linux-2.6.12-xen0 directory:
>>>
>>>patch -p2 < xenoprof-2.0-linux-2.6.12.patch make kernels
>>>
>>>This will ultimately fail. Then do:
>>>
>>>In linux-2.6.12-xenU directory:
>>>
>>>patch -p2 < xenoprof-2.0-linux-2.6.12.patch make kernels
>>>
>>>This will succeed. Then do:
>>>
>>>make dist
>>>sudo make install
>>>
>>>
>>>In oprofile source directory:
>>>
>>>patch -p1 < oprofile-0.9.1-xen.patch
>>>
>>>
>>>Install oprofile normally
>>>
>>>
>>>Santos, Jose Renato G wrote:
>>>
>>>      
>>>
>>>>David,
>>>>
>>>>You are right. This is not very clean.
>>>>Yes, you need to do a "make" to create the xen0 and xenU 
>>>>        
>>>>
>>>trees before 
>>>      
>>>
>>>>applying the patch in step c).
>>>>If you configure the kernel with oprofile support (CONFIG_OPROFILE) 
>>>>before step c) you will probably get a compilation error 
>>>>        
>>>>
>>>when you run 
>>>      
>>>
>>>>make since the patch was not applied yet. You could either delay 
>>>>setting (CONFIG_OPROFILE) for after you apply patch "c" or you can 
>>>>apply the patch after you get the compilation error, and 
>>>>        
>>>>
>>>then run make 
>>>      
>>>
>>>>again.
>>>>
>>>>It would be better if there was a "make" option to create 
>>>>        
>>>>
>>>the xen0/xenU 
>>>      
>>>
>>>>trees without compiling them. Does anybody know if there is such an 
>>>>option? I remember looking for it in the Makefile and not 
>>>>        
>>>>
>>>finding it, 
>>>      
>>>
>>>>but this was a while ago.
>>>>
>>>>We are now working on getting the xenoprof code included in 
>>>>xen-unstable.
>>>>This should make life much easier for those wanting to use oprofile.
>>>>
>>>>Renato   
>>>>
>>>> 
>>>>
>>>>        
>>>>
>>>>>>-----Original Message-----
>>>>>>From: xen-devel-bounces@lists.xensource.com
>>>>>>[mailto:xen-devel-bounces@lists.xensource.com] On Behalf Of David 
>>>>>>Carr
>>>>>>Sent: Tuesday, April 04, 2006 7:31 PM
>>>>>>To: xen-devel@lists.xensource.com
>>>>>>Subject: [Xen-devel] Compiling xenoprof
>>>>>>
>>>>>>I'm having some trouble compiling Xen 3.0.0 with the xenoprof 
>>>>>>patches.
>>>>>>
>>>>>>The xenoprof instructions say:
>>>>>>
>>>>>> In order to run OProfile in Xen environments four patches are 
>>>>>>needed:
>>>>>> a) xenoprof-2.0-xen-3.0.0.patch
>>>>>>    Patch for Xen hypervisor.
>>>>>> b) xenoprof-2.0-linux-2.6-sparse.patch
>>>>>>    Patch for Xenolinux. Contains oprofile architecture specific 
>>>>>>driver
>>>>>>    for xen (Apply to linux-sparse tree in Xen source tree)
>>>>>> c) xenoprof-2.0-linux-2.6.12.patch
>>>>>>    Patch for oprofile kernel module in linux 2.6.12. 
>>>>>>Contain modifications
>>>>>>    to generic oprofile driver code to support xen. 
>>>>>>            
>>>>>>
>>>(Apply twice, 
>>>      
>>>
>>>>>>once to
>>>>>>    dom0 and once to domU trees)
>>>>>>
>>>>>>
>>>>>>Every thing goes fine until part c.  The linux-2.6.12-xen0 and 
>>>>>>linux-2.6.12-xenU directories are empty until you build xen (and 
>>>>>>therefore can't be patched yet.)  Doing a make world will 
>>>>>>            
>>>>>>
>>>populate 
>>>      
>>>
>>>>>>these trees but also compiles everything.
>>>>>>
>>>>>>What is the proper sequence of patching and make commands 
>>>>>>            
>>>>>>
>>>to build a 
>>>      
>>>
>>>>>>xenoprof tree?
>>>>>>
>>>>>>Thanks,
>>>>>>David Carr
>>>>>>
>>>>>>
>>>>>>
>>>>>>_______________________________________________
>>>>>>Xen-devel mailing list
>>>>>>Xen-devel@lists.xensource.com
>>>>>>http://lists.xensource.com/xen-devel
>>>>>>
>>>>>>     
>>>>>>
>>>>>>            
>>>>>>
>>>      
>>>
>
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