linux-kernel - Re: [PATCH] perf-probe: rewrite find_lazy_match

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Date:	Mon, 07 Feb 2011 18:32:27 +0900
From:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
To:	Arnaldo Carvalho de Melo <acme@...stprotocols.net>
Cc:	Franck Bui-Huu <vagabon.xyz@...il.com>,
	lkml <linux-kernel@...r.kernel.org>,
	2nddept-manager@....hitachi.co.jp
Subject: Re: [PATCH] perf-probe: rewrite find_lazy_match_lines() by using
 getline(3)

Hi Arnaldo,

Could you merge this patch into your perf/core tree?
This makes code very simple and easy to read :-)

Thank you,

(2011/01/13 19:25), Masami Hiramatsu wrote:
> (2011/01/13 19:18), Franck Bui-Huu wrote:
>> From: Franck Bui-Huu <fbuihuu@...il.com>
>>
>> Signed-off-by: Franck Bui-Huu <fbuihuu@...il.com>
> 
> Looks very nice! :)
> 
> Acked-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
> 
> Thanks!
> 
>> ---
>>  tools/perf/util/probe-finder.c |   70 +++++++++++++++------------------------
>>  1 files changed, 27 insertions(+), 43 deletions(-)
>>
>> diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
>> index ddf4d45..4221738 100644
>> --- a/tools/perf/util/probe-finder.c
>> +++ b/tools/perf/util/probe-finder.c
>> @@ -1092,51 +1092,38 @@ static int find_probe_point_by_line(struct probe_finder *pf)
>>  static int find_lazy_match_lines(struct list_head *head,
>>  				 const char *fname, const char *pat)
>>  {
>> -	char *fbuf, *p1, *p2;
>> -	int fd, line, nlines = -1;
>> -	struct stat st;
>> -
>> -	fd = open(fname, O_RDONLY);
>> -	if (fd < 0) {
>> -		pr_warning("Failed to open %s: %s\n", fname, strerror(-fd));
>> +	FILE *fp;
>> +	char *line = NULL;
>> +	size_t line_len;
>> +	ssize_t len;
>> +	int count = 0, linenum = 1;
>> +
>> +	fp = fopen(fname, "r");
>> +	if (!fp) {
>> +		pr_warning("Failed to open %s: %s\n", fname, strerror(errno));
>>  		return -errno;
>>  	}
>>  
>> -	if (fstat(fd, &st) < 0) {
>> -		pr_warning("Failed to get the size of %s: %s\n",
>> -			   fname, strerror(errno));
>> -		nlines = -errno;
>> -		goto out_close;
>> -	}
>> -
>> -	nlines = -ENOMEM;
>> -	fbuf = malloc(st.st_size + 2);
>> -	if (fbuf == NULL)
>> -		goto out_close;
>> -	if (read(fd, fbuf, st.st_size) < 0) {
>> -		pr_warning("Failed to read %s: %s\n", fname, strerror(errno));
>> -		nlines = -errno;
>> -		goto out_free_fbuf;
>> -	}
>> -	fbuf[st.st_size] = '\n';	/* Dummy line */
>> -	fbuf[st.st_size + 1] = '\0';
>> -	p1 = fbuf;
>> -	line = 1;
>> -	nlines = 0;
>> -	while ((p2 = strchr(p1, '\n')) != NULL) {
>> -		*p2 = '\0';
>> -		if (strlazymatch(p1, pat)) {
>> -			line_list__add_line(head, line);
>> -			nlines++;
>> +	while ((len = getline(&line, &line_len, fp)) > 0) {
>> +
>> +		if (line[len - 1] == '\n')
>> +			line[len - 1] = '\0';
>> +
>> +		if (strlazymatch(line, pat)) {
>> +			line_list__add_line(head, linenum);
>> +			count++;
>>  		}
>> -		line++;
>> -		p1 = p2 + 1;
>> -	}
>> -out_free_fbuf:
>> -	free(fbuf);
>> -out_close:
>> -	close(fd);
>> -	return nlines;
>> +		linenum++;
>> +	}
>> +
>> +	if (ferror(fp))
>> +		count = -errno;
>> +	free(line);
>> +	fclose(fp);
>> +
>> +	if (count == 0)
>> +		pr_debug("No matched lines found in %s.\n", fname);
>> +	return count;
>>  }
>>  
>>  /* Find probe points from lazy pattern  */
>> @@ -1154,10 +1141,7 @@ static int find_probe_point_lazy(Dwarf_Die *sp_die, struct probe_finder *pf)
>>  		/* Matching lazy line pattern */
>>  		ret = find_lazy_match_lines(&pf->lcache, pf->fname,
>>  					    pf->pev->point.lazy_line);
>> -		if (ret == 0) {
>> -			pr_debug("No matched lines found in %s.\n", pf->fname);
>> -			return 0;
>> -		} else if (ret < 0)
>> +		if (ret <= 0)
>>  			return ret;
>>  	}
>>  
> 
> 


-- 
Masami HIRAMATSU
2nd Dept. Linux Technology Center
Hitachi, Ltd., Systems Development Laboratory
E-mail: masami.hiramatsu.pt@...achi.com
--
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