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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@kernel.org>
Cc: Raphael Beamonte <raphael.beamonte@gmail.com>
Cc: David Ahern <dsahern@gmail.com>
Cc: Matt Fleming <matt@codeblueprint.co.uk>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Link: http://lkml.kernel.org/r/1440596813-12844-3-git-send-email-jolsa@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Jiri Olsa 2015-08-26 15:46:44 +02:00 committed by Arnaldo Carvalho de Melo
parent 0b5a7935f3
commit 9f44f0cc1c
2 changed files with 5 additions and 53 deletions
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56
tools/perf/util/util.c
View File

@ -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;

2
tools/perf/util/util.h
View File

@ -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);