From: Keir Fraser <keir.fraser@eu.citrix.com>
To: Wei Wang2 <wei.wang2@amd.com>,
George Dunlap <George.Dunlap@eu.citrix.com>
Cc: "xen-devel@lists.xensource.com" <xen-devel@lists.xensource.com>
Subject: Re: [PATCH 0/2] xenoprofile: Add IBS support
Date: Fri, 6 Aug 2010 15:59:16 +0100 [thread overview]
Message-ID: <C881E1D4.1D004%keir.fraser@eu.citrix.com> (raw)
In-Reply-To: <201008061634.09776.wei.wang2@amd.com>
On 06/08/2010 15:34, "Wei Wang2" <wei.wang2@amd.com> 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@amd.com> 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@amd.com>
>>> --
>>> AMD GmbH, Germany
>>> Operating System Research Center
>>>
>>> Legal Information:
>>> Advanced Micro Devices GmbH
>>> Karl-Hammerschmidt-Str. 34
>>> 85609 Dornach b. München
>>>
>>> Geschäftsführer: Andrew Bowd, Thomas M. McCoy, Giuliano Meroni
>>> Sitz: Dornach, Gemeinde Aschheim, Landkreis München
>>> Registergericht München, HRB Nr. 43632
>>>
>>>
>>> _______________________________________________
>>> Xen-devel mailing list
>>> Xen-devel@lists.xensource.com
>>> http://lists.xensource.com/xen-devel
>
>
>
>
> _______________________________________________
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prev parent reply other threads:[~2010-08-06 14:59 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-07-30 13:28 [PATCH 0/2] xenoprofile: Add IBS support Wei Wang2
2010-08-06 14:13 ` George Dunlap
2010-08-06 14:34 ` Wei Wang2
2010-08-06 14:59 ` Keir Fraser [this message]
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