linux-kernel - Re: [PATCH V5 11/16] perf, core: Pass perf_sample_data to perf

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Message-ID: <20141007162956.GB6652@twins.programming.kicks-ass.net>
Date:	Tue, 7 Oct 2014 18:29:56 +0200
From:	Peter Zijlstra <peterz@...radead.org>
To:	"Liang, Kan" <kan.liang@...el.com>
Cc:	"eranian@...gle.com" <eranian@...gle.com>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"paulus@...ba.org" <paulus@...ba.org>,
	"acme@...nel.org" <acme@...nel.org>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>,
	"Yan, Zheng" <zheng.z.yan@...el.com>
Subject: Re: [PATCH V5 11/16] perf, core: Pass perf_sample_data to
 perf_callchain()

On Tue, Oct 07, 2014 at 03:50:45PM +0000, Liang, Kan wrote:
> The data is originally from br_stack which is LBR format.

Right, its read from the LBR, therefore this must be.

> What the patch did is to convert it to CALLCHAIN output format in kernel.

I saw that.

> So you'd like to let the kernel pass the LBR output format data to user space
> perf tool,  and let perf tool to generate the callchain information?

Right, then we can also compare the two when they're both available.
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