linux-kernel - Re: [PATCH 1/2] perf tools: enable LBR call stack support

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Message-ID: <20141112075049.GB22994@krava>
Date:	Wed, 12 Nov 2014 08:50:49 +0100
From:	Jiri Olsa <jolsa@...hat.com>
To:	kan.liang@...el.com
Cc:	acme@...nel.org, a.p.zijlstra@...llo.nl, eranian@...gle.com,
	linux-kernel@...r.kernel.org, mingo@...hat.com, paulus@...ba.org,
	ak@...ux.intel.com
Subject: Re: [PATCH 1/2] perf tools: enable LBR call stack support

On Thu, Nov 06, 2014 at 09:58:05AM -0500, kan.liang@...el.com wrote:

SNIP

>  };
>  
> diff --git a/tools/perf/util/evsel.c b/tools/perf/util/evsel.c
> index 2f9e680..8c23607 100644
> --- a/tools/perf/util/evsel.c
> +++ b/tools/perf/util/evsel.c
> @@ -537,13 +537,24 @@ int perf_evsel__group_desc(struct perf_evsel *evsel, char *buf, size_t size)
>  }
>  
>  static void
> -perf_evsel__config_callgraph(struct perf_evsel *evsel)
> +perf_evsel__config_callgraph(struct perf_evsel *evsel,
> +			     struct record_opts *opts)
>  {
>  	bool function = perf_evsel__is_function_event(evsel);
>  	struct perf_event_attr *attr = &evsel->attr;
>  
>  	perf_evsel__set_sample_bit(evsel, CALLCHAIN);
>  
> +	if (callchain_param.record_mode == CALLCHAIN_LBR) {
> +		if (!opts->branch_stack) {
> +			perf_evsel__set_sample_bit(evsel, BRANCH_STACK);
> +			attr->branch_sample_type = PERF_SAMPLE_BRANCH_USER |
> +						PERF_SAMPLE_BRANCH_CALL_STACK;
> +			attr->exclude_user = 0;

I think we shouldn't siletly change attr->exclude_user,
if it was defined, we need to display warning that
we are changing that or fail

jirka
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