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

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Message-ID: <20141112075026.GA22994@krava>
Date:	Wed, 12 Nov 2014 08:50:26 +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

>  		    (sample_type & PERF_SAMPLE_STACK_USER))
>  			callchain_param.record_mode = CALLCHAIN_DWARF;
> +		else if (sample_type & PERF_SAMPLE_BRANCH_STACK)
> +			callchain_param.record_mode = CALLCHAIN_LBR;
>  		else
>  			callchain_param.record_mode = CALLCHAIN_FP;
>  	}
> diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> index 0022980..72ed39b 100644
> --- a/tools/perf/util/callchain.c
> +++ b/tools/perf/util/callchain.c
> @@ -97,6 +97,14 @@ int parse_callchain_record_opt(const char *arg)
>  				callchain_param.dump_size = size;
>  			}
>  #endif /* HAVE_DWARF_UNWIND_SUPPORT */
> +		} else if (!strncmp(name, "lbr", sizeof("lbr"))) {
> +			if (!strtok_r(NULL, ",", &saveptr)) {
> +				callchain_param.record_mode = CALLCHAIN_LBR;
> +				ret = 0;
> +			} else
> +				pr_err("callchain: No more arguments "
> +					"needed for -g lbr\n");

should it be 'needed for --call-graph' option?   ^^^^^^^^^^^

jirka
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