Oprofile & VMware: workaround doesn't work

[David F. <mdf...@ya...>]

After running Oprofile on my virtual machine [Ubuntu 7.04, kernel 
2.6.20] I am unable to generate a report because no sample file gets 
generated: 

~ $ sudo opcontrol --no-vmlinux 

~ $ sudo opcontrol --start 
Using default event: CPU_CLK_UNHALTED:100000:0:1:1 
Using 2.6+ OProfile kernel interface. 
Using log file /var/lib/oprofile/oprofiled.log 
Daemon started. 
Profiler running. 

~ $ sudo opcontrol --dump 

~ $ sudo opcontrol --shutdown 

~ $ sudo opreport 
opreport error: No sample file found: try running opcontrol --dump or 
specify a session containing sample files 


I checked the Oprofile FAQ  http://oprofile.sourceforge.net/faq/ which 
states: 
"OProfile can't work with VMware when using performance counter 
interface. A workaround is to use RTC mode (2.4 kernel) or timer 
interrupt mode (2.6 kernel)" 

So, on Ubuntu 7.04 I need timer interrupt mode. I then checked the 
Oprofile configuration guide 
http://oprofile.sourceforge.net/doc/detailed-parameters.html#timer 
which states that I can force timer-interrupt mode by setting Oprofile's 
timer=1 module parameter. However, modinfo shows me that this parameter 
is already set: 

~ $ modinfo oprofile 
filename: 
/lib/modules/2.6.20-16-generic/kernel/arch/i386/oprofile/oprofile.ko 
description:    OProfile system profiler 
author:         John Levon <le...@mo...> 
license:        GPL 
srcversion:     041F647C2EF855CDE9407AC 
depends:        vermagic:       2.6.20-16-generic SMP mod_unload 586 
parm:           p4force:int 
parm:           timer:force use of timer interrupt (int) 

Help would be appreciated. 
.... Dave


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