linux-kernel - Re: [PATCH] perf report: Fix debug messages with --call-graph option

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Date:   Fri, 22 Sep 2017 11:18:41 +0200
From:   Jiri Olsa <jolsa@...hat.com>
To:     zhangmengting <zhangmengting@...wei.com>
Cc:     linux-kernel@...r.kernel.org, linux-perf-users@...r.kernel.org,
        peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
        alexander.shishkin@...ux.intel.com, yao.jin@...ux.intel.com,
        ak@...ux.intel.com, jolsa@...nel.org, namhyung@...nel.org,
        kjlx@...pleofstupid.com, milian.wolff@...b.com,
        wangnan0@...wei.com, huawei.libin@...wei.com
Subject: Re: [PATCH] perf report: Fix debug messages with --call-graph option

On Fri, Sep 22, 2017 at 10:06:53AM +0800, zhangmengting wrote:
> With --call-graph option, perf report can display call chains using
> type, min percent threshold, optional print limit and order. And the
> default call-graph parameter is 'graph,0.5,caller,function,percent'.
> 
> Before this patch, 'perf report --call-graph' shows incorrect debug
> messages as below:
> [root@...alhost perf]# ./perf report --call-graph
> Invalid callchain mode: 0.5
> Invalid callchain order: 0.5
> Invalid callchain sort key: 0.5
> Invalid callchain config key: 0.5
> Invalid callchain mode: caller
> Invalid callchain mode: function
> Invalid callchain order: function
> Invalid callchain mode: percent
> Invalid callchain order: percent
> Invalid callchain sort key: percent

hum, could you please mention what was wrong with
the code and why the change fixes them?

looks like you just moved the warning out of the
way of the report

thanks,
jirka

> 
> The patch fixes this issue.
> 
> Signed-off-by: zhangmengting <zhangmengting@...wei.com>
> ---
>  tools/perf/util/callchain.c | 35 +++++++++++++++++++++--------------
>  1 file changed, 21 insertions(+), 14 deletions(-)
> 
> diff --git a/tools/perf/util/callchain.c b/tools/perf/util/callchain.c
> index 510b513..be09d77 100644
> --- a/tools/perf/util/callchain.c
> +++ b/tools/perf/util/callchain.c
> @@ -65,8 +65,6 @@ static int parse_callchain_mode(const char *value)
>  		callchain_param.mode = CHAIN_FOLDED;
>  		return 0;
>  	}
> -
> -	pr_err("Invalid callchain mode: %s\n", value);
>  	return -1;
>  }
>  
> @@ -82,8 +80,6 @@ static int parse_callchain_order(const char *value)
>  		callchain_param.order_set = true;
>  		return 0;
>  	}
> -
> -	pr_err("Invalid callchain order: %s\n", value);
>  	return -1;
>  }
>  
> @@ -105,8 +101,6 @@ static int parse_callchain_sort_key(const char *value)
>  		callchain_param.branch_callstack = 1;
>  		return 0;
>  	}
> -
> -	pr_err("Invalid callchain sort key: %s\n", value);
>  	return -1;
>  }
>  
> @@ -124,8 +118,6 @@ static int parse_callchain_value(const char *value)
>  		callchain_param.value = CCVAL_COUNT;
>  		return 0;
>  	}
> -
> -	pr_err("Invalid callchain config key: %s\n", value);
>  	return -1;
>  }
>  
> @@ -319,12 +311,27 @@ int perf_callchain_config(const char *var, const char *value)
>  
>  		return ret;
>  	}
> -	if (!strcmp(var, "print-type"))
> -		return parse_callchain_mode(value);
> -	if (!strcmp(var, "order"))
> -		return parse_callchain_order(value);
> -	if (!strcmp(var, "sort-key"))
> -		return parse_callchain_sort_key(value);
> +	if (!strcmp(var, "print-type")){
> +		int ret;
> +		ret = parse_callchain_mode(value);
> +		if (ret == -1)
> +			pr_err("Invalid callchain mode: %s\n", value);
> +		return ret;
> +	}
> +	if (!strcmp(var, "order")){
> +		int ret;
> +		ret = parse_callchain_order(value);
> +		if (ret == -1)
> +			pr_err("Invalid callchain order: %s\n", value);
> +		return ret;
> +	}
> +	if (!strcmp(var, "sort-key")){
> +		int ret;
> +		ret = parse_callchain_sort_key(value);
> +		if (ret == -1)
> +			pr_err("Invalid callchain sort key: %s\n", value);
> +		return ret;
> +	}
>  	if (!strcmp(var, "threshold")) {
>  		callchain_param.min_percent = strtod(value, &endptr);
>  		if (value == endptr) {
> -- 
> 1.7.12.4
>