linux-kernel - Re: [PATCH] perf tools: Create for_each_event{_system,

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Date:   Mon, 30 Jan 2017 10:08:12 +0100
From:   Jiri Olsa <jolsa@...hat.com>
To:     Taeung Song <treeze.taeung@...il.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        linux-kernel@...r.kernel.org, Jiri Olsa <jolsa@...nel.org>,
        Namhyung Kim <namhyung@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Wang Nan <wangnan0@...wei.com>,
        Steven Rostedt <rostedt@...dmis.org>,
        Frederic Weisbecker <fweisbec@...il.com>
Subject: Re: [PATCH] perf tools: Create for_each_event{_system, _file} macros
 for tracepoints iteration

On Mon, Jan 30, 2017 at 05:35:28PM +0900, Taeung Song wrote:

SNIP

> +#define for_each_event_system(dir, dent, tps)			\
> +	while ((dent = readdir(dir)))				\
> +		if (dent->d_type == DT_DIR &&			\
> +		    (strcmp(dent->d_name, ".")) &&		\
> +		    (strcmp(dent->d_name, "..")) &&		\
> +		    (name_in_tp_list(dent->d_name, tps)))
> +
>  static int copy_event_system(const char *sys, struct tracepoint_path *tps)
>  {
>  	struct dirent *dent;
> @@ -186,12 +193,7 @@ static int copy_event_system(const char *sys, struct tracepoint_path *tps)
>  		return -errno;
>  	}
>  
> -	while ((dent = readdir(dir))) {
> -		if (dent->d_type != DT_DIR ||
> -		    strcmp(dent->d_name, ".") == 0 ||
> -		    strcmp(dent->d_name, "..") == 0 ||
> -		    !name_in_tp_list(dent->d_name, tps))
> -			continue;
> +	for_each_event_system(dir, dent, tps) {
>  		if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
>  			err = -ENOMEM;
>  			goto out;
> @@ -210,12 +212,7 @@ static int copy_event_system(const char *sys, struct tracepoint_path *tps)
>  	}
>  
>  	rewinddir(dir);
> -	while ((dent = readdir(dir))) {
> -		if (dent->d_type != DT_DIR ||
> -		    strcmp(dent->d_name, ".") == 0 ||
> -		    strcmp(dent->d_name, "..") == 0 ||
> -		    !name_in_tp_list(dent->d_name, tps))
> -			continue;
> +	for_each_event_system(dir, dent, tps) {
>  		if (asprintf(&format, "%s/%s/format", sys, dent->d_name) < 0) {
>  			err = -ENOMEM;
>  			goto out;
> @@ -266,6 +263,14 @@ static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
>  	return false;
>  }
>  
> +#define for_each_event_file(dir, dent, tps)			\
> +	while ((dent = readdir(dir)))				\
> +		if (dent->d_type == DT_DIR &&			\
> +		    (strcmp(dent->d_name, ".")) &&		\
> +		    (strcmp(dent->d_name, "..")) &&		\
> +		    (strcmp(dent->d_name, "ftrace")) &&		\
> +		    (system_in_tp_list(dent->d_name, tps)))

looks almost the same as for_each_event_system macro,
what's the difference other than 'ftrace' check?
also why's one 'file' and the other 'system'? looks
like we coud have just one macro in here

jirka