Re: [Xen-devel] profiling active RHEL 4 PV domains with xenoprof

[Andrew Evans <andrewe@xxxxxxxxxxxxx>]

On 01/29/10 04:41, George Dunlap wrote:
> Re the PV kernels: are you sure that the PV kernel has support for Xen
> profiling? PV xenoprofile makes hypercalls to Xen to set up the
> performance event counters.  But if that isn't set up properly, or for
> some other reason doesn't work right, the guest oprofile may default
> back to using only timers, for which it doesn't need Xen's help (but
> which are less accurate especially in a virtual environment).
>   

I'm pretty sure RHEL 4's 2.6.9 kernel doesn't have the xenoprof patches,
but I haven't looked yet. I'm going to try the 2.6.18 xenU kernel I
built from the xen-unstable tree and see how that goes.

thanks,

-Andrew


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