linux-kernel - Re: [PATCH V7 00/17] perf, x86: Haswell LBR call stack support

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Message-ID: <20141105162723.GW3337@twins.programming.kicks-ass.net>
Date:	Wed, 5 Nov 2014 17:27:23 +0100
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>,
	"jolsa@...hat.com" <jolsa@...hat.com>,
	"ak@...ux.intel.com" <ak@...ux.intel.com>
Subject: Re: [PATCH V7 00/17] perf, x86: Haswell LBR call stack support

On Wed, Nov 05, 2014 at 04:22:09PM +0000, Liang, Kan wrote:
> 
> >> 
> > 
> > So if I take all except 11,13,16,17 but instead do something like the below,
> > everything will work just fine, right?
> > 
> > Or am I missing something?
> > 
> 
> Yes, it should work.  Then LBR callstack will rely on user to enable it.
> But user never get the LBR callstack data if it's available.  
> I'm not sure why you do that? 

Uhm what? If you request PERF_SAMPLE_BRANCH_CALL_STACK the user will get
the data through the regular PERF_SAMPLE_BRANCH_STACK output of
PERF_RECORD_SAMPLE, right?
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