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Message-ID: <20150226150512.GA13373@kernel.org>
Date: Thu, 26 Feb 2015 12:05:12 -0300
From: Arnaldo Carvalho de Melo <acme@...nel.org>
To: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
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>,
Hemant Kumar <hemant@...ux.vnet.ibm.com>
Subject: Re: [perf/core PATCH v5 2/4] perf buildid-cache: Add --purge FILE to
remove all caches of FILE
Em Thu, Feb 26, 2015 at 03:54:47PM +0900, Masami Hiramatsu escreveu:
> @@ -285,6 +308,7 @@ int cmd_buildid_cache(int argc, const char **argv,
> bool force = false;
> char const *add_name_list_str = NULL,
> *remove_name_list_str = NULL,
> + *purge_name_list_str = NULL,
> *missing_filename = NULL,
> *update_name_list_str = NULL,
> *kcore_filename = NULL;
> @@ -302,6 +326,8 @@ int cmd_buildid_cache(int argc, const char **argv,
> "file", "kcore file to add"),
> OPT_STRING('r', "remove", &remove_name_list_str, "file list",
> "file(s) to remove"),
> + OPT_STRING('p', "purge", &purge_name_list_str, "path list",
> + "path(s) to remove (remove old caches too)"),
> OPT_STRING('M', "missing", &missing_filename, "file",
> "to find missing build ids in the cache"),
> OPT_BOOLEAN('f', "force", &force, "don't complain, do it"),
> @@ -368,6 +394,24 @@ int cmd_buildid_cache(int argc, const char **argv,
> }
> }
>
> + if (purge_name_list_str) {
> + list = strlist__new(true, purge_name_list_str);
> + if (list) {
> + strlist__for_each(pos, list)
> + if (build_id_cache__purge_path(pos->s)) {
> + if (errno == ENOENT) {
> + pr_debug("%s wasn't in the cache\n",
> + pos->s);
> + continue;
> + }
> + pr_warning("Couldn't remove %s: %s\n",
> + pos->s, strerror_r(errno, sbuf, sizeof(sbuf)));
> + }
> +
> + strlist__delete(list);
> + }
Here we need to at least warn the user that what he/she asked couldn't
be done, i.e. strlist__new() failed.
Seeing --remove, --purge and --update makes me think eventually we need
a OPT_STRLIST() :-)
I'm going thru the other patches, the first got in already.
Thanks for implementing --purge!
- Arnaldo
> + }
> +
> if (missing_filename)
> ret = build_id_cache__fprintf_missing(session, stdout);
>
> diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
> index 0bc33be..dcaa964 100644
> --- a/tools/perf/util/build-id.c
> +++ b/tools/perf/util/build-id.c
> @@ -281,35 +281,85 @@ void disable_buildid_cache(void)
> no_buildid_cache = true;
> }
>
> +static char *build_id_cache__dirname_from_path(const char *name,
> + bool is_kallsyms, bool is_vdso)
> +{
> + char *realname = (char *)name, *filename;
> + bool slash = is_kallsyms || is_vdso;
> +
> + if (!slash) {
> + realname = realpath(name, NULL);
> + if (!realname)
> + return NULL;
> + }
> +
> + if (asprintf(&filename, "%s%s%s", buildid_dir, slash ? "/" : "",
> + is_vdso ? DSO__NAME_VDSO : realname) < 0)
> + filename = NULL;
> +
> + if (!slash)
> + free(realname);
> +
> + return filename;
> +}
> +
> +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);
> + strlist__delete(list);
> + 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 +387,7 @@ 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);
>
--
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