linux-kernel - Re: [perf/core PATCH v4 2/2] perf buildid-cache: Add --purge FILE to remove all caches of FILE

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Date:	Sat, 21 Feb 2015 00:37:45 +0530
From:	Hemant Kumar <hemant@...ux.vnet.ibm.com>
To:	Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>,
	Arnaldo Carvalho de Melo <acme@...nel.org>
CC:	Peter Zijlstra <a.p.zijlstra@...llo.nl>,
	Adrian Hunter <adrian.hunter@...el.com>,
	linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>,
	Paul Mackerras <paulus@...ba.org>,
	Jiri Olsa <jolsa@...nel.org>,
	Namhyung Kim <namhyung@...nel.org>,
	Borislav Petkov <bp@...e.de>
Subject: Re: [perf/core PATCH v4 2/2] perf buildid-cache: Add --purge FILE
 to remove all caches of FILE

Hi Masami,

Just a small suggestion below.

On 02/20/2015 03:11 PM, Masami Hiramatsu wrote:
> [SNIP]
> +
> +struct strlist *build_id_cache__list_build_ids(const char *pathname)
> +{
> +	struct strlist *list;
> +	char *dirname;
> +	DIR *dir;
> +	struct dirent *d;
> +
> +	list = strlist__new(true, NULL);
> +	dirname = build_id_cache__dirname_from_path(pathname, false, false);
> +	if (!list || !dirname)
> +		goto error_free;
> +
> +	/* List up all dirents */
> +	dir = opendir(dirname);
> +	if (!dir)
> +		goto error_free;
> +	while ((d = readdir(dir)) != NULL) {
> +		if (!strcmp(d->d_name, ".") || !strcmp(d->d_name, ".."))
> +			continue;
> +		strlist__add(list, d->d_name);
> +	}
> +	closedir(dir);
> +
> +	free(dirname);
> +	return list;
> +
> +error_free:
> +	free(dirname);
> +	if (list)
> +		strlist__delete(list);

Maybe we don't need the "if (list)" check here as strlist__delete 
already checks for this.

> +	return NULL;
> +}
> +
>   int build_id_cache__add_s(const char *sbuild_id, const char *name,
>   			  bool is_kallsyms, bool is_vdso)
>   {
>   	const size_t size = PATH_MAX;
> -	char *realname, *filename = zalloc(size),
> +	char *realname = NULL, *filename = NULL, *dirname = NULL,
>   	     *linkname = zalloc(size), *targetname, *tmp;
> -	int len, err = -1;
> -	bool slash = is_kallsyms || is_vdso;
> +	int err = -1;
>
> -	if (is_kallsyms) {
> -		if (symbol_conf.kptr_restrict) {
> -			pr_debug("Not caching a kptr_restrict'ed /proc/kallsyms\n");
> -			err = 0;
> -			goto out_free;
> -		}
> -		realname = (char *) name;
> -	} else
> +	if (!is_kallsyms) {
>   		realname = realpath(name, NULL);
> +		if (!realname)
> +			goto out_free;
> +	}
>
> -	if (realname == NULL || filename == NULL || linkname == NULL)
> +	dirname = build_id_cache__dirname_from_path(name, is_kallsyms, is_vdso);
> +	if (!dirname)
>   		goto out_free;
>
> -	len = scnprintf(filename, size, "%s%s%s",
> -		       buildid_dir, slash ? "/" : "",
> -		       is_vdso ? DSO__NAME_VDSO : realname);
> -	if (mkdir_p(filename, 0755))
> +	if (mkdir_p(dirname, 0755))
>   		goto out_free;
>
> -	snprintf(filename + len, size - len, "/%s", sbuild_id);
> +	if (asprintf(&filename, "%s/%s", dirname, sbuild_id) < 0) {
> +		filename = NULL;
> +		goto out_free;
> +	}
>
>   	if (access(filename, F_OK)) {
>   		if (is_kallsyms) {
> @@ -337,6 +388,7 @@ out_free:
>   	if (!is_kallsyms)
>   		free(realname);
>   	free(filename);
> +	free(dirname);
>   	free(linkname);
>   	return err;
>   }
> diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
> index 2a09498..cbcadea 100644
> --- a/tools/perf/util/build-id.h
> +++ b/tools/perf/util/build-id.h
> @@ -22,6 +22,7 @@ bool perf_session__read_build_ids(struct perf_session *session, bool with_hits);
>   int perf_session__write_buildid_table(struct perf_session *session, int fd);
>   int perf_session__cache_build_ids(struct perf_session *session);
>
> +struct strlist *build_id_cache__list_build_ids(const char *pathname);
>   bool build_id_cache__cached(const char *sbuild_id);
>   int build_id_cache__add_s(const char *sbuild_id,
>   			  const char *name, bool is_kallsyms, bool is_vdso);
>

-- 
Thanks,
Hemant Kumar

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