linux-kernel - Re: [PATCH 00/12] perf_events: add support for sampling taken branches (v2)

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Message-ID: <CABPqkBQG9QF7Kx3uMZCBjin60+stNU88hy6Z1KzBn9W7j=uLCw@mail.gmail.com>
Date:	Tue, 6 Dec 2011 11:22:28 -0800
From:	Stephane Eranian <eranian@...gle.com>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	Will Deacon <will.deacon@....com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...e.hu" <mingo@...e.hu>,
	"acme@...hat.com" <acme@...hat.com>,
	"ming.m.lin@...el.com" <ming.m.lin@...el.com>,
	"andi@...stfloor.org" <andi@...stfloor.org>,
	"robert.richter@....com" <robert.richter@....com>,
	"ravitillo@....gov" <ravitillo@....gov>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"benh@...nel.crashing.org" <benh@...nel.crashing.org>,
	"rth@...ddle.net" <rth@...ddle.net>,
	"ralf@...ux-mips.org" <ralf@...ux-mips.org>,
	"davem@...emloft.net" <davem@...emloft.net>,
	"lethal@...ux-sh.org" <lethal@...ux-sh.org>
Subject: Re: [PATCH 00/12] perf_events: add support for sampling taken
 branches (v2)

On Tue, Dec 6, 2011 at 11:20 AM, Peter Zijlstra <peterz@...radead.org> wrote:
> On Tue, 2011-12-06 at 11:14 -0800, Stephane Eranian wrote:
>
>> >> > Other than the few comments given it all looks good. My main worry is
>> >> > the Intel only aspect, I'd really love for there to be another platform
>> >> > that could implement at least part of this.
>
>> There is a hardware branch buffer on all Itanium processors.
>> You can find the description for the McKinley implementation
>>  (Itanium2) branch buffer in section 10.3.9 from:
>> http://download.intel.com/design/Itanium2/manuals/25111003.pdf
>
>
> Yeah, I knew Itanic has it, but one its sinking (and doesn't have perf
> support), and two its still Intel ;-)
>
It's just an example of a different implementation of a branch buffer.
That's why I mentioned it. The question is: could the branch_stack
abstraction map to it. I think it could.

>
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