linux-kernel - Re: [PATCH 04/10] perf, tools, report: Add processing for cycle histograms

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Date:	Tue, 26 May 2015 12:09:12 +0200
From:	Jiri Olsa <jolsa@...hat.com>
To:	Andi Kleen <andi@...stfloor.org>
Cc:	acme@...nel.org, linux-kernel@...r.kernel.org, namhyung@...nel.org,
	eranian@...gle.com, Andi Kleen <ak@...ux.intel.com>
Subject: Re: [PATCH 04/10] perf, tools, report: Add processing for cycle
 histograms

On Sun, May 10, 2015 at 06:52:00AM -0700, Andi Kleen wrote:

SNIP

>  		mi = he->mem_info;
>  		err = addr_map_symbol__inc_samples(&mi->daddr, evsel->idx);
> diff --git a/tools/perf/util/hist.c b/tools/perf/util/hist.c
> index 302fc05..cf6b48b 100644
> --- a/tools/perf/util/hist.c
> +++ b/tools/perf/util/hist.c
> @@ -1412,6 +1412,39 @@ int hists__link(struct hists *leader, struct hists *other)
>  	return 0;
>  }
>  
> +void hist__account_cycles(struct branch_stack *bs, struct addr_location *al,
> +			  struct perf_sample *sample, bool nonstd_branch_mode)
> +{
> +	struct branch_info *bi;
> +
> +	/* If we have branch cycles always annotate them. */
> +	if (bs && bs->nr && bs->entries[0].flags.cycles) {

hum, so this is assuming that having cycles fort 1st entry
means there'll be for the rest?

Also in that case why is there the '!= cycles' check within
addr_map_symbol__account_cycles ?

jirka
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