Re: [Xen-devel] Don't mount hardware performance counter using xenoprof

[Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>]

On Sat, Jan 08, 2011 at 04:06:58PM +0900, Yuto Nakai wrote:
> Hi,
> 
> I want to use xenoprof to profile the overhead of the hypervisor.
> I patched the oprofile-0.9.5 using the patch from xenoprof.sourceforge.net
> 
> Debian GNU/Linux 5.0 (lenny)
> Xen-4.0.1 + 2.6.32.27 (linux-2.6-pvops.git) Dom0
> My platform is Intel(R) Core(TM) i7 CPU           960  @ 3.20GHz
> 
> My problems are:
> In Dom0,  But hardware performance counters don't be mounted
> after initialization (opcontrol --init)
> 
> # ls /dev/oprofile
> backtrace_depth    cpu_buffer_size   pointer_size
> buffer                    cpu_type            stats
> buffer_size             dump                time_slice
> buffer_watershed    enable
> 
> 0(and 1,2,3) directories are not exist.
> 
> Is there any reason for this ?

Do they exist when booting a baremetal kernel?

> 
>  Any help is appreciated. Thanks, Yuto Nakai

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