Re: [Xen-devel] [PATCH 0/2] xenoprofile: Add IBS support

[Keir Fraser <keir.fraser@xxxxxxxxxxxxx>]

On 06/08/2010 15:34, "Wei Wang2" <wei.wang2@xxxxxxx> wrote:

> Hi George,
> IBS is Instruction-Based Sampling which is a new profiling technique
> introduced by AMD Family 10 processor that can provide rich, precise
> performance information. You can read more details about this from the white
> paper http://developer.amd.com/assets/amd_ibs_paper_en.pdf
> 
> IBS feature is also well documented on Software Optimization Guide for AMD
> Family 10h Processors
> http://support.amd.com/us/Processor_TechDocs/40546-PUB-Optguide_3-11_5-21-09.p
> df

Yeah it's a lot like the old Alpha ProfileMe tagged instruction profiling.
In fact I wouldn't be surprised if some of the same engineers are involved,
since a bunch of them ended up at AMD. I'm not sure what oprofile can do
with all that lovely rich information -- a big part of the profiling setup
on Alpha was the associated always-on DCPI software and its integration into
the toolchain. If something like that is developed in open source for
x86/AMD it would be super cool!

 -- Keir

> Thanks,
> Wei
> 
> On Friday 06 August 2010 16:13:15 George Dunlap wrote:
>> May I ask a (potentially) dumb question: what is IBS?
>>  -George
>> 
>> On Fri, Jul 30, 2010 at 2:28 PM, Wei Wang2 <wei.wang2@xxxxxxx> wrote:
>>> Hi,
>>> This patch set adds IBS support for AMD family 10h processors. The major
>>> implementation is derived from latest Linux. Two hypercalls are added,
>>> which is necessary for IBS feature detection and user mode parameter
>>> read. Thanks,
>>> -Wei
>>> 
>>> Signed-off-by: Wei Wang <wei.wang2@xxxxxxx>
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> 
> 
> 
> 
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