Re: [perfmon2] AMD IBS Support

[Ramachandra CN <cn....@gm...>]

Hi Robert,

Thanks for the useful suggestions. This should help me get going.

Regards,
Ram

On Tue, Apr 24, 2012 at 11:09 AM, Robert Richter <rob...@am...> wrote:
> On 13.04.12 13:05:00, Ramachandra CN wrote:
>> With respect to this old post, is the IBS related kernel patch, part
>> of the latest mainline kernel?
>
> No, the patches are not yet upstream. The latest (updated) code base
> is still here:
>
>  http://git.kernel.org/?p=linux/kernel/git/rric/oprofile.git;a=shortlog;h=refs/heads/perf-ibs
>
> Since the example code was nacked it isn't part of the latest patch
> submission and also didn't go into libpfm4. The latest version of
> it is here:
>
>  http://article.gmane.org/gmane.linux.kernel/1193674
>
> It should probably work with the kernel patches above, but I didn't
> review and test it.
>
> For collecting samples with the kernel version above I suggest using
> perf-record and perf-script-ibs with the perf tools patches from here:
>
>  http://git.kernel.org/?p=linux/kernel/git/rric/oprofile.git;a=shortlog;h=refs/heads/perf-ibs-v4
>
> But all of this is very much work in progress, sorry for that.
>
>> I am running linux kernel 2.34 and wanted to experiment with
>> ibs_sampl.c example. Do I have to apply the kernel patch before I try
>> this?
>
> Wrt the kernel version I suggest to work close with the tip tree that
> the branches above base on. Version 2.6.34 is too old to patch it.
>
>> Also, I couldn't find the corresponding code changes in libpfm4. So I
>> guess I will have to use the libpmf4 patch
>> (https://lkml.org/lkml/2010/10/18/329)
>
> This code does not work with the latest user/kernel i/f. Use the
> sample code of my [V3] patch set of the link above.
>
> I will post a rework of userspace patches next days (but no example
> code included).
>
> Hope that helps.
>
> -Robert
>
> --
> Advanced Micro Devices, Inc.
> Operating System Research Center
>