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Subject[tip:perf/urgent] perf tools: Dont use openat()
Commit-ID:  725b13685c61168f71825b3fb67d96d2d7aa3b0f
Gitweb: http://git.kernel.org/tip/725b13685c61168f71825b3fb67d96d2d7aa3b0f
Author: Eric Dumazet <eric.dumazet@gmail.com>
AuthorDate: Thu, 24 Sep 2009 15:39:09 +0200
Committer: Ingo Molnar <mingo@elte.hu>
CommitDate: Thu, 24 Sep 2009 21:20:08 +0200

perf tools: Dont use openat()

openat() is still a young glibc facility, better to not use it in a
non performance critical program (perf list)

Many machines have older glibc (RHEL 4 Update 5 -> glibc-2.3.4-2.36
on my dev machine for example).

Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Ulrich Drepper <drepper@redhat.com>
LKML-Reference: <4ABB767D.6080004@gmail.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>


---
tools/perf/util/parse-events.c | 49 ++++++++++++++++-----------------------
1 files changed, 20 insertions(+), 29 deletions(-)
diff --git a/tools/perf/util/parse-events.c b/tools/perf/util/parse-events.c
index 13ab4b8..87c424d 100644
--- a/tools/perf/util/parse-events.c
+++ b/tools/perf/util/parse-events.c
@@ -165,33 +165,31 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
char id_buf[4];
- int sys_dir_fd, fd;
+ int fd;
u64 id;
char evt_path[MAXPATHLEN];
+ char dir_path[MAXPATHLEN];

if (valid_debugfs_mount(debugfs_path))
return NULL;

sys_dir = opendir(debugfs_path);
if (!sys_dir)
- goto cleanup;
- sys_dir_fd = dirfd(sys_dir);
+ return NULL;

for_each_subsystem(sys_dir, sys_dirent, sys_next) {
- int dfd = openat(sys_dir_fd, sys_dirent.d_name,
- O_RDONLY|O_DIRECTORY), evt_dir_fd;
- if (dfd == -1)
- continue;
- evt_dir = fdopendir(dfd);
- if (!evt_dir) {
- close(dfd);
+
+ snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
+ sys_dirent.d_name);
+ evt_dir = opendir(dir_path);
+ if (!evt_dir)
continue;
- }
- evt_dir_fd = dirfd(evt_dir);
+
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
- snprintf(evt_path, MAXPATHLEN, "%s/id",
+
+ snprintf(evt_path, MAXPATHLEN, "%s/%s/id", dir_path,
evt_dirent.d_name);
- fd = openat(evt_dir_fd, evt_path, O_RDONLY);
+ fd = open(evt_path, O_RDONLY);
if (fd < 0)
continue;
if (read(fd, id_buf, sizeof(id_buf)) < 0) {
@@ -225,7 +223,6 @@ struct tracepoint_path *tracepoint_id_to_path(u64 config)
closedir(evt_dir);
}

-cleanup:
closedir(sys_dir);
return NULL;
}
@@ -761,28 +758,24 @@ static void print_tracepoint_events(void)
{
DIR *sys_dir, *evt_dir;
struct dirent *sys_next, *evt_next, sys_dirent, evt_dirent;
- int sys_dir_fd;
char evt_path[MAXPATHLEN];
+ char dir_path[MAXPATHLEN];

if (valid_debugfs_mount(debugfs_path))
return;

sys_dir = opendir(debugfs_path);
if (!sys_dir)
- goto cleanup;
- sys_dir_fd = dirfd(sys_dir);
+ return;

for_each_subsystem(sys_dir, sys_dirent, sys_next) {
- int dfd = openat(sys_dir_fd, sys_dirent.d_name,
- O_RDONLY|O_DIRECTORY), evt_dir_fd;
- if (dfd == -1)
- continue;
- evt_dir = fdopendir(dfd);
- if (!evt_dir) {
- close(dfd);
+
+ snprintf(dir_path, MAXPATHLEN, "%s/%s", debugfs_path,
+ sys_dirent.d_name);
+ evt_dir = opendir(dir_path);
+ if (!evt_dir)
continue;
- }
- evt_dir_fd = dirfd(evt_dir);
+
for_each_event(sys_dirent, evt_dir, evt_dirent, evt_next) {
snprintf(evt_path, MAXPATHLEN, "%s:%s",
sys_dirent.d_name, evt_dirent.d_name);
@@ -791,8 +784,6 @@ static void print_tracepoint_events(void)
}
closedir(evt_dir);
}
-
-cleanup:
closedir(sys_dir);
}


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