linux-kernel - Re: [PATCH 2/3] perf: Add support for extra parameters for raw events

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Message-ID: <AANLkTin18+4927APgdb_JzKn3fgq6wiLP04J+4S2Q0YB@mail.gmail.com>
Date:	Fri, 12 Nov 2010 16:00:10 +0100
From:	Stephane Eranian <eranian@...gle.com>
To:	Frederic Weisbecker <fweisbec@...il.com>
Cc:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Andi Kleen <andi@...stfloor.org>,
	Corey Ashford <cjashfor@...ux.vnet.ibm.com>,
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org,
	mingo@...e.hu, acme@...hat.com, paulus <paulus@...ba.org>
Subject: Re: [PATCH 2/3] perf: Add support for extra parameters for raw events

On Fri, Nov 12, 2010 at 2:30 PM, Frederic Weisbecker <fweisbec@...il.com> wrote:
> On Fri, Nov 12, 2010 at 02:00:43PM +0100, Stephane Eranian wrote:
>> On Fri, Nov 12, 2010 at 12:36 PM, Peter Zijlstra <a.p.zijlstra@...llo.nl> wrote:
>> > On Fri, 2010-11-12 at 11:49 +0100, Stephane Eranian wrote:
>> >> The difficulty with PEBS-LL (load latency) is not so much the encoding of the
>> >> latency. It is more how to expose the data back to user. You get a full PEBS
>> >> record for each miss. So you get the PEBS machine state + data addr, miss
>> >> latency, and data source (where did the line come from). We have already
>> >> discussed how to expose machine state in general. I'll work on a patch for this.
>> >
>> > Frederic was working on this PERF_SAMPLE_REGS stuff as well for his copy
>> > the stack top and let dwarfs go wild at it patches.
>> >
>> Ok, I'll talk to him again about this then.
>
>
> Would you like me to respin this isolated chunk of my dwarf cfi unwinding patchset?
> So that we can discuss the ABI.
>
I'd like to see your proposed kernel API to expose machine state.

> Thanks.
>
>
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