linux-kernel - [tip:perf/core] perf tools: Add tracing

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Date:	Mon, 31 Aug 2015 01:32:41 -0700
From:	tip-bot for Jiri Olsa <tipbot@...or.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	hpa@...or.com, tglx@...utronix.de, namhyung@...nel.org,
	a.p.zijlstra@...llo.nl, matt@...eblueprint.co.uk, mingo@...nel.org,
	raphael.beamonte@...il.com, dsahern@...il.com, jolsa@...nel.org,
	acme@...hat.com, linux-kernel@...r.kernel.org
Subject: [tip:perf/core] perf tools:
  Add tracing_path and remove unneeded functions

Commit-ID:  9f44f0cc1c32f1542071447a9493652bbc03facb
Gitweb:     http://git.kernel.org/tip/9f44f0cc1c32f1542071447a9493652bbc03facb
Author:     Jiri Olsa <jolsa@...nel.org>
AuthorDate: Wed, 26 Aug 2015 15:46:44 +0200
Committer:  Arnaldo Carvalho de Melo <acme@...hat.com>
CommitDate: Fri, 28 Aug 2015 14:53:51 -0300

perf tools: Add tracing_path and remove unneeded functions

There's no need for find_tracing_dir, because perf already searches for
debugfs/tracefs mount on start and populate tracing_events_path.

Adding tracing_path to carry tracing dir string to be used in
get_tracing_file instead of calling find_tracing_dir.

Signed-off-by: Jiri Olsa <jolsa@...nel.org>
Cc: Raphael Beamonte <raphael.beamonte@...il.com>
Cc: David Ahern <dsahern@...il.com>
Cc: Matt Fleming <matt@...eblueprint.co.uk>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: Peter Zijlstra <a.p.zijlstra@...llo.nl>
Link: http://lkml.kernel.org/r/1440596813-12844-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/util/util.c | 56 ++++----------------------------------------------
 tools/perf/util/util.h |  2 +-
 2 files changed, 5 insertions(+), 53 deletions(-)

diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
index f7adf12..d33c341 100644
--- a/tools/perf/util/util.c
+++ b/tools/perf/util/util.c
@@ -34,6 +34,7 @@ bool test_attr__enabled;
 bool perf_host  = true;
 bool perf_guest = false;
 
+char tracing_path[PATH_MAX + 1]        = "/sys/kernel/debug/tracing";
 char tracing_events_path[PATH_MAX + 1] = "/sys/kernel/debug/tracing/events";
 
 void event_attr_init(struct perf_event_attr *attr)
@@ -391,6 +392,8 @@ void set_term_quiet_input(struct termios *old)
 
 static void set_tracing_events_path(const char *tracing, const char *mountpoint)
 {
+	snprintf(tracing_path, sizeof(tracing_path), "%s/%s",
+		 mountpoint, tracing);
 	snprintf(tracing_events_path, sizeof(tracing_events_path), "%s/%s%s",
 		 mountpoint, tracing, "events");
 }
@@ -440,62 +443,11 @@ void perf_debugfs_set_path(const char *mntpt)
 	set_tracing_events_path("tracing/", mntpt);
 }
 
-static const char *find_tracefs(void)
-{
-	const char *path = __perf_tracefs_mount(NULL);
-
-	return path;
-}
-
-static const char *find_debugfs(void)
-{
-	const char *path = __perf_debugfs_mount(NULL);
-
-	if (!path)
-		fprintf(stderr, "Your kernel does not support the debugfs filesystem");
-
-	return path;
-}
-
-/*
- * Finds the path to the debugfs/tracing
- * Allocates the string and stores it.
- */
-const char *find_tracing_dir(void)
-{
-	const char *tracing_dir = "";
-	static char *tracing;
-	static int tracing_found;
-	const char *debugfs;
-
-	if (tracing_found)
-		return tracing;
-
-	debugfs = find_tracefs();
-	if (!debugfs) {
-		tracing_dir = "/tracing";
-		debugfs = find_debugfs();
-		if (!debugfs)
-			return NULL;
-	}
-
-	if (asprintf(&tracing, "%s%s", debugfs, tracing_dir) < 0)
-		return NULL;
-
-	tracing_found = 1;
-	return tracing;
-}
-
 char *get_tracing_file(const char *name)
 {
-	const char *tracing;
 	char *file;
 
-	tracing = find_tracing_dir();
-	if (!tracing)
-		return NULL;
-
-	if (asprintf(&file, "%s/%s", tracing, name) < 0)
+	if (asprintf(&file, "%s/%s", tracing_path, name) < 0)
 		return NULL;
 
 	return file;
diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
index 88a8915..291be1d 100644
--- a/tools/perf/util/util.h
+++ b/tools/perf/util/util.h
@@ -83,10 +83,10 @@
 extern const char *graph_line;
 extern const char *graph_dotted_line;
 extern char buildid_dir[];
+extern char tracing_path[];
 extern char tracing_events_path[];
 extern void perf_debugfs_set_path(const char *mountpoint);
 const char *perf_debugfs_mount(const char *mountpoint);
-const char *find_tracing_dir(void);
 char *get_tracing_file(const char *name);
 void put_tracing_file(char *file);
 
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