linux-kernel - Re: [RFC][PATCH 7/7] perf/annotate: Add branch stack / basic block information

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Date:	Fri, 8 Jul 2016 16:55:55 +0200
From:	Ingo Molnar <mingo@...nel.org>
To:	Peter Zijlstra <peterz@...radead.org>
Cc:	acme@...nel.org, linux-kernel@...r.kernel.org, andi@...stfloor.org,
	eranian@...gle.com, jolsa@...nel.org,
	torvalds@...ux-foundation.org, davidcc@...gle.com,
	alexander.shishkin@...ux.intel.com, namhyung@...nel.org,
	kan.liang@...el.com, khandual@...ux.vnet.ibm.com
Subject: Re: [RFC][PATCH 7/7] perf/annotate: Add branch stack / basic block
 information

* Peter Zijlstra <peterz@...radead.org> wrote:

> $ perf record --branch-filter u,any -e cycles:p ./branches 27
> $ perf annotate branches

Btw., I'd really like to use this feature all the time, so could we please 
simplify this somewhat via a subcommand, via something like:

  perf record branches ./branches 27

or if 'record' subcommands are not possible anymore:

  perf record --branches ./branches 27

and in this case 'perf annotate' should automatically pick up the fact that the 
perf.data was done with --branches - i.e. the highlighting should be automagic.

I.e. the only thing a user has to remember to use all this is a single 
'--branches' option to perf record - instead of a complex sequence for perf record 
and another sequence for perf annotate.

It would also be nice to have 'perf top --branches', with the built-in annotation 
showing the highlighted branch heat map information and highlighting.

Thanks,

	Ingo