Re: State of "perf: Add a new sort order: SORT_INCLUSIVE"

From: Namhyung Kim
Date: Tue Oct 29 2013 - 01:26:08 EST

On Mon, 28 Oct 2013 21:10:38 -0700, Arun Sharma wrote:
> On 10/28/13 8:11 PM, Namhyung Kim wrote:
> Hey Namhyung:
>>> Also, what's the reasoning for --cumulate not being an option under
>>> perf record -g ..,<order>?
>> Sorry, I cannot understand you. The 'perf record' just saves sample
>> data (and callchains) from the ring-buffer. All the processing happens
>> in 'perf report'. I can't see what you expect from the 'perf record
>> --cumulate'. Am I missing something?
> Yes - I meant to say perf report -g :)


>> -g [type,min[,limit],order]
> Specifically, along with callee, caller, we could have a third
> option. Or we could have a new type (graph, fractal, cumulative).

That's also fine by me. But I added --cumulate since it's quite
different from other callchain behaviors.

If we go with -g option, I'd like add it as a new type.

>>> Given that there are clear use cases in production involving complex
>>> callgraphs, I'm for getting this support in first and then reconciling
>>> the differences with perf record -b later.
>> I think what Frederic said is that the code de-duplication of 'perf
>> report' side. The branch stack and --cumulate are different - branch
>> stack concentrates on the branch itself but --cumulate uses callchains
>> to find parents and give some credit to them as side information.
> Me too. I brought it up with Stephane at some point in the last year
> or so and there wasn't an obvious way to de-duplicate because of these
> differences.

Yeah, looking at the code, I can hardly find how I can do it. :-/

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