linux-kernel - Re: [PATCH 2/2] perf tools: Construct LBR call chain

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Message-ID: <20141112085859.GB25338@krava>
Date:	Wed, 12 Nov 2014 09:58:59 +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 2/2] perf tools: Construct LBR call chain

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

SNIP

> +			callchain_nr = i + 1;
> +		}
> +	}
> +
> +	printf("... chain: nr:%" PRIu64 "\n", total_nr);
> +
> +	for (i = 0; i < callchain_nr + 1; i++)
>  		printf("..... %2d: %016" PRIx64 "\n",
>  		       i, sample->callchain->ips[i]);
> +
> +	if (total_nr > callchain_nr) {
> +		struct branch_stack *lbr_stack = sample->branch_stack;
> +
> +		for (i = 0; i < lbr_stack->nr; i++)
> +			printf("..... %2d: %016" PRIx64 "\n",
> +				(int)(i + callchain_nr + 1), lbr_stack->entries[i].from);

could u describe in comment why only ->from entries are interesting?

thanks,
jirka
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