[Xen-users] Xen and Oprofile

["Bhatia, Nikhil" <bhatia@xxxxxxxx>]

Hello Xenoprof Users,

 

Can someone please verify the steps to get a oprofile session profile multiple sessions? I am using a file VBD for spawning two guest OS domains on the host. I am doing the following:

 

1.) On dom0

 

Opcontrol --xen=/boot/xen-syms-blah

 

2.) On domU domID: 41

 

Opcontrol --vmlinux=/boot/vmlinux-2..blah

 

3.) On domU domID: 42

 

Opcontrol --vmlinux=/boot/vmlinux-2..blah

 

 

4.) On dom0

 

Opcontrol --start-daemon --active-domains=41,42

 

 

5.) On domU, 41

 

Opcontrol --reset

Opcontrol --start

 

Error:

Using default event: CPU_CLK_UNHALTED:100000:0:1:1 Using 2.6+ OProfile kernel interface.

Reading module info.

Failed to open profile device: Operation not permitted Couldn't start oprofiled.

Check the log file "/var/lib/oprofile/oprofiled.log" and kernel syslog

 

 

6.) On domU, 42

 

Opcontrol --reset

Opcontrol --start

 

 

Error:

Using default event: CPU_CLK_UNHALTED:100000:0:1:1 Using 2.6+ OProfile kernel interface.

Reading module info.

Failed to open profile device: Operation not permitted Couldn't start oprofiled.

Check the log file "/var/lib/oprofile/oprofiled.log" and kernel syslog

 

7.) On dom0

 

Opcontrol --reset

Opcontrol --start

 

This works...

 

Thanks,

Nikhil

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