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

[Andrew Evans <andrewe@xxxxxxxxxxxxx>]

On 01/29/10 09:04, Santos, Jose Renato G wrote:
> Yes, you need need xenoprof support both in the kernel and in the
> OProfile user level tools in anctive profiled domain.

Thanks for clarifying.

>   Are you sure Oprofile user level tools has xenoprof support?
>   The latest patch avaialable in http://xenoprof.sourceforge.net/ is for 
> oprofile 0.9.5 but you claim to be using 0.9.6
>   Try using 0.9.5 and apply the patch.
>   

Upstream OProfile 0.9.6 doesn't include xenoprof support. What I did was
fix the xenoprof patch for 0.9.5 so it applies cleanly to 0.9.6. The
changes were trivial and only affected the usage message in opcontrol
IIRC. I'll attach it so you can put it up for download. OProfile 0.9.5
has some fairly serious bugs that 0.9.6 has fixed, so that's why I'm
using 0.9.6.

> No, you should use the same event in dom0 and domU and not timer mode.
>   If Oprofile is reporting timer mode in domU there is something wrong in its 
> OProfile configuration; either you don't have the right patches or you are 
> not correctly synchronyzing dom0 and domU opcontrol commands.
>   

Ok, I'll check my OProfile configuration. Thanks very much.

-Andrew

Attachment: oprofile-0.9.6-xen.patch
Description: Text document

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