linux-kernel - Re: [V3][PATCH 0/7] perf, x86: Implement AMD IBS

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Message-ID: <20111004171603.GI21506@erda.amd.com>
Date:	Tue, 4 Oct 2011 19:16:03 +0200
From:	Robert Richter <robert.richter@....com>
To:	Peter Zijlstra <peterz@...radead.org>
CC:	Andi Kleen <andi@...stfloor.org>, Ingo Molnar <mingo@...e.hu>,
	Stephane Eranian <eranian@...gle.com>,
	LKML <linux-kernel@...r.kernel.org>,
	Don Zickus <dzickus@...hat.com>,
	acme <acme@...stprotocols.net>,
	Frédéric Weisbecker <fweisbec@...il.com>,
	Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [V3][PATCH 0/7] perf, x86: Implement AMD IBS

On 04.10.11 12:45:09, Peter Zijlstra wrote:
> I would much prefer perf {ibs,pebs} commands implemented in C, so that
> normal people can change/improve them too.

Would a perf {ibs,pebs} be an ascii dump or so? Then I just would
better extend perf-report (-D option) to support decoding of raw
samples from dynamically pmus. Something like:

# perf report -D
[...]
. ... raw event: size 88 bytes
.  0000:  01 00 00 00 02 00 58 00 6d 11 00 00 6d 11 00 00  ......X.m...m...
.  0010:  00 80 86 b7 00 00 00 00 00 10 01 00 00 00 00 00  ................
.  0020:  00 00 00 00 00 00 00 00 2f 6c 69 62 2f 6c 69 62  ......../lib/lib
.  0030:  7a 2e 73 6f 2e 31 2e 32 2e 33 00 00 00 00 00 00  z.so.1.2.3......
.  0040:  00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
.  0050:  00 00 00 00 00 00 00 00                          ........
.  # IBS sample (ibs_fetch):
.  # IbsFetchCtl          = 0x0000000000000000
.  #   IbsFetchMaxCnt=0
.  #   IbsFetchCnt=0
.  #   IbsFetchLat=0
.  #   IbsFetchEn=0
.  #   IbsFetchVal=0
.  #   IbsFetchComp=0
.  #   IbsIcMiss=0
.  #   IbsPhyAddrValid=0
.  #   IbsL1TlbPgSz=0
.  #   IbsL1TlbMiss=0
.  #   IbsL2TlbMiss=0
.  #   IbsRandEn=0
.  # IbsFetchLinAd        = 0x00000000813e8b80
.  #   IbsFetchLinAd=0xffffffff813e8b80
.  # IbsFetchPhysAd       = 0x00000000013e8b80
.  #   IbsFetchPhysAd=0x13e8b80
[...]

(Data decoding not correct in this example.)

This wouln't require architecture specific commands.

-Robert

-- 
Advanced Micro Devices, Inc.
Operating System Research Center

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