linux-kernel - [PATCH perf/core v4 17/19] perf-list: Skip SDTs placed in invalid binaries

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Message-Id: <20160426090450.11891.73025.stgit@devbox>
Date:	Tue, 26 Apr 2016 18:04:50 +0900
From:	Masami Hiramatsu <mhiramat@...nel.org>
To:	Arnaldo Carvalho de Melo <acme@...nel.org>
Cc:	Masami Hiramatsu <mhiramat@...nel.org>,
	linux-kernel@...r.kernel.org, Namhyung Kim <namhyung@...nel.org>,
	Peter Zijlstra <peterz@...radead.org>,
	Ingo Molnar <mingo@...hat.com>,
	Hemant Kumar <hemant@...ux.vnet.ibm.com>,
	Ananth N Mavinakayanahalli <ananth@...ux.vnet.ibm.com>
Subject: [PATCH perf/core v4 17/19] perf-list: Skip SDTs placed in invalid binaries

From: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>

Skip SDTs placed in invalid (non-exist, or older version)
binaries. Note that perf-probe --cache --list and
perf-probe --cache --del still handle all the caches
including invalid binaries.

Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@...achi.com>
Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
---
 Changes in v4:
  - Rename a parameter 'valid' to 'validonly' :)
---
 tools/perf/builtin-probe.c     |    2 +-
 tools/perf/util/build-id.c     |   27 ++++++++++++++++++++++++++-
 tools/perf/util/build-id.h     |    2 +-
 tools/perf/util/parse-events.c |    2 +-
 tools/perf/util/probe-file.c   |    2 +-
 5 files changed, 30 insertions(+), 5 deletions(-)

diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 8f61525..4a86aea 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -370,7 +370,7 @@ static int del_perf_probe_caches(struct strfilter *filter)
 	struct str_node *nd;
 	int ret;
 
-	ret = build_id_cache__list_all(&bidlist);
+	ret = build_id_cache__list_all(&bidlist, false);
 	if (ret < 0) {
 		pr_debug("Failed to get buildids: %d\n", ret);
 		return ret;
diff --git a/tools/perf/util/build-id.c b/tools/perf/util/build-id.c
index 49a467b9..c849253 100644
--- a/tools/perf/util/build-id.c
+++ b/tools/perf/util/build-id.c
@@ -184,6 +184,25 @@ out:
 	return ret;
 }
 
+static bool build_id_cache__valid_id(char *sbuild_id)
+{
+	char real_sbuild_id[SBUILD_ID_SIZE] = "";
+	char *pathname;
+	bool ret;
+
+	pathname = build_id_cache__origname(sbuild_id);
+	if (!pathname)
+		return false;
+
+	if (filename__sprintf_build_id(pathname, real_sbuild_id) < 0)
+		ret = false;
+	else
+		ret = (strcmp(sbuild_id, real_sbuild_id) == 0);
+	free(pathname);
+
+	return ret;
+}
+
 static const char *build_id_cache__basename(bool is_kallsyms, bool is_vdso)
 {
 	return is_kallsyms ? "kallsyms" : (is_vdso ? "vdso" : "elf");
@@ -394,7 +413,7 @@ void disable_buildid_cache(void)
 	no_buildid_cache = true;
 }
 
-int build_id_cache__list_all(struct strlist **result)
+int build_id_cache__list_all(struct strlist **result, bool validonly)
 {
 	struct strlist *toplist, *list, *bidlist;
 	struct str_node *nd, *nd2;
@@ -402,6 +421,10 @@ int build_id_cache__list_all(struct strlist **result)
 	char sbuild_id[SBUILD_ID_SIZE];
 	int ret = 0;
 
+	/* for filename__ functions */
+	if (validonly)
+		symbol__init(NULL);
+
 	/* Open the top-level directory */
 	if (asprintf(&topdir, "%s/.build-id/", buildid_dir) < 0)
 		return -errno;
@@ -431,6 +454,8 @@ int build_id_cache__list_all(struct strlist **result)
 					nd->s, nd2->s);
 				continue;
 			}
+			if (validonly && !build_id_cache__valid_id(sbuild_id))
+				continue;
 			strlist__add(bidlist, sbuild_id);
 		}
 		strlist__delete(list);
diff --git a/tools/perf/util/build-id.h b/tools/perf/util/build-id.h
index 2c98a39..5e29cfc 100644
--- a/tools/perf/util/build-id.h
+++ b/tools/perf/util/build-id.h
@@ -32,7 +32,7 @@ char *build_id_cache__origname(const char *sbuild_id);
 char *build_id_cache__linkname(const char *sbuild_id, char *bf, size_t size);
 char *build_id_cache__dirname_from_path(const char *sbuild_id, const char *name,
 					bool is_kallsyms, bool is_vdso);
-int build_id_cache__list_all(struct strlist **result);
+int build_id_cache__list_all(struct strlist **result, bool validonly);
 int build_id_cache__list_build_ids(const char *pathname,
 				   struct strlist **result);
 bool build_id_cache__cached(const char *sbuild_id);
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index f9c8b7b..53d52a3 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -1994,7 +1994,7 @@ void print_sdt_events(const char *subsys_glob, const char *event_glob,
 		pr_debug("Failed to allocate new strlist for SDT\n");
 		return;
 	}
-	ret = build_id_cache__list_all(&bidlist);
+	ret = build_id_cache__list_all(&bidlist, true);
 	if (ret < 0) {
 		pr_debug("Failed to get buildids: %d\n", ret);
 		return;
diff --git a/tools/perf/util/probe-file.c b/tools/perf/util/probe-file.c
index ee560dd..2437b48 100644
--- a/tools/perf/util/probe-file.c
+++ b/tools/perf/util/probe-file.c
@@ -770,7 +770,7 @@ int probe_cache__show_all_caches(struct strfilter *filter)
 	pr_debug("list cache with filter: %s\n", buf);
 	free(buf);
 
-	ret = build_id_cache__list_all(&bidlist);
+	ret = build_id_cache__list_all(&bidlist, false);
 	if (ret < 0) {
 		pr_debug("Failed to get buildids: %d\n", ret);
 		return ret == -ENOENT ? 0 : ret;