linux-kernel - Re: [PATCH v6 13/18] perf: add support for taken branch sampling to perf report

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Message-ID: <20120214214708.GC27941@infradead.org>
Date:	Tue, 14 Feb 2012 19:47:08 -0200
From:	Arnaldo Carvalho de Melo <acme@...hat.com>
To:	Stephane Eranian <eranian@...gle.com>
Cc:	linux-kernel@...r.kernel.org, peterz@...radead.org, mingo@...e.hu,
	robert.richter@....com, ming.m.lin@...el.com, andi@...stfloor.org,
	asharma@...com, ravitillo@....gov, vweaver1@...s.utk.edu,
	khandual@...ux.vnet.ibm.com, dsahern@...il.com
Subject: Re: [PATCH v6 13/18] perf: add support for taken branch sampling
	to perf report

Em Thu, Feb 09, 2012 at 11:21:03PM +0100, Stephane Eranian escreveu:
> From: Roberto Agostino Vitillo <ravitillo@....gov>
> 
> This patch adds support for taken branch sampling, i.e, the
> PERF_SAMPLE_BRANCH_STACK feature to perf report. In other
> words, to display histograms based on taken branches rather
> than executed instructions addresses.
> 
> The new option is called -b and it takes no argument. To
> generate meaningful output, the perf.data must have been
> obtained using perf record -b xxx ... where xxx is a branch
> filter option.
> 
> The output shows symbols, modules, sorted by 'who branches
> where' the most often. The percentages reported in the first
> column refer to the total number of branches captured and
> not the usual number of samples.
> 
> Here is a quick example.
> Here branchy is simple test program which looks as follows:

Thanks for addressing the comments, looks good now,

Acked-by: Arnaldo Carvalho de Melo <acme@...hat.com>

- Arnaldo
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