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Date: Sat, 19 Dec 2009 16:40:28 -0500
From: Ulrich Drepper <drepper@...hat.com>
To: a.p.zijlstra@...llo.nl, acme@...hat.com, eranian@...gle.com,
fweisbec@...il.com, linux-kernel@...r.kernel.org,
lizf@...fujitsu.com, mingo@...e.hu, paulus@...ba.org,
penberg@...helsinki.fi, xiaoguangrong@...fujitsu.com
Subject: perf: A few more directory handling optimizations
A few more optimizations for perf when dealing with directories. Some of
them significantly cut down the work which has to be done. d_type should
always be set; otherwise fix the kernel code. And there are functions
available to parse fstab-like files, so use them.
Signed-off-by: Ulrich Drepper <drepper@...hat.com>
builtin-kmem.c | 17 +++++-----------
util/trace-event-info.c | 49 +++++++++++++++++++++---------------------------
2 files changed, 28 insertions(+), 38 deletions(-)
diff --git a/tools/perf/builtin-kmem.c b/tools/perf/builtin-kmem.c
index fc21ad7..a438c54 100644
--- a/tools/perf/builtin-kmem.c
+++ b/tools/perf/builtin-kmem.c
@@ -92,23 +92,18 @@ static void setup_cpunode_map(void)
if (!dir1)
return;
- while (true) {
- dent1 = readdir(dir1);
- if (!dent1)
- break;
-
- if (sscanf(dent1->d_name, "node%u", &mem) < 1)
+ while ((dent1 = readdir(dir1)) != NULL) {
+ if (dent1->d_type != DT_DIR ||
+ sscanf(dent1->d_name, "node%u", &mem) < 1)
continue;
snprintf(buf, PATH_MAX, "%s/%s", PATH_SYS_NODE, dent1->d_name);
dir2 = opendir(buf);
if (!dir2)
continue;
- while (true) {
- dent2 = readdir(dir2);
- if (!dent2)
- break;
- if (sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
+ while ((dent2 = readdir(dir2)) != NULL) {
+ if (dent2->d_type != DT_LNK ||
+ sscanf(dent2->d_name, "cpu%u", &cpu) < 1)
continue;
cpunode_map[cpu] = mem;
}
diff --git a/tools/perf/util/trace-event-info.c b/tools/perf/util/trace-event-info.c
index cace355..bff6d8c 100644
--- a/tools/perf/util/trace-event-info.c
+++ b/tools/perf/util/trace-event-info.c
@@ -20,6 +20,7 @@
*/
#define _GNU_SOURCE
#include <dirent.h>
+#include <mntent.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
@@ -103,28 +104,27 @@ static const char *find_debugfs(void)
{
static char debugfs[MAX_PATH+1];
static int debugfs_found;
- char type[100];
FILE *fp;
+ struct mntent *m;
if (debugfs_found)
return debugfs;
- if ((fp = fopen("/proc/mounts","r")) == NULL)
+ if ((fp = setmntent("/proc/mounts", "r")) == NULL)
die("Can't open /proc/mounts for read");
- while (fscanf(fp, "%*s %"
- STR(MAX_PATH)
- "s %99s %*s %*d %*d\n",
- debugfs, type) == 2) {
- if (strcmp(type, "debugfs") == 0)
+ while ((m = getmntent(fp)) != NULL) {
+ if (strcmp(m->mnt_type, "debugfs") == 0) {
+ strcpy(debugfs, m->mnt_dir);
+ debugfs_found = 1;
break;
+ }
}
- fclose(fp);
- if (strcmp(type, "debugfs") != 0)
- die("debugfs not mounted, please mount");
+ endmntent(fp);
- debugfs_found = 1;
+ if (! debugfs_found)
+ die("debugfs not mounted, please mount");
return debugfs;
}
@@ -317,7 +317,8 @@ static void copy_event_system(const char *sys, struct tracepoint_path *tps)
die("can't read directory '%s'", sys);
while ((dent = readdir(dir))) {
- if (strcmp(dent->d_name, ".") == 0 ||
+ if (dent->d_type != DT_DIR ||
+ strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0 ||
!name_in_tp_list(dent->d_name, tps))
continue;
@@ -334,7 +335,8 @@ static void copy_event_system(const char *sys, struct tracepoint_path *tps)
rewinddir(dir);
while ((dent = readdir(dir))) {
- if (strcmp(dent->d_name, ".") == 0 ||
+ if (dent->d_type != DT_DIR ||
+ strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0 ||
!name_in_tp_list(dent->d_name, tps))
continue;
@@ -394,26 +396,21 @@ static void read_event_files(struct tracepoint_path *tps)
die("can't read directory '%s'", path);
while ((dent = readdir(dir))) {
- if (strcmp(dent->d_name, ".") == 0 ||
+ if (dent->d_type != DT_DIR ||
+ strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0 ||
strcmp(dent->d_name, "ftrace") == 0 ||
!system_in_tp_list(dent->d_name, tps))
continue;
- sys = malloc_or_die(strlen(path) + strlen(dent->d_name) + 2);
- sprintf(sys, "%s/%s", path, dent->d_name);
- ret = stat(sys, &st);
- free(sys);
- if (ret < 0)
- continue;
- if (S_ISDIR(st.st_mode))
- count++;
+ count++;
}
write_or_die(&count, 4);
rewinddir(dir);
while ((dent = readdir(dir))) {
- if (strcmp(dent->d_name, ".") == 0 ||
+ if (dent->d_type != DT_DIR ||
+ strcmp(dent->d_name, ".") == 0 ||
strcmp(dent->d_name, "..") == 0 ||
strcmp(dent->d_name, "ftrace") == 0 ||
!system_in_tp_list(dent->d_name, tps))
@@ -422,10 +419,8 @@ static void read_event_files(struct tracepoint_path *tps)
sprintf(sys, "%s/%s", path, dent->d_name);
ret = stat(sys, &st);
if (ret >= 0) {
- if (S_ISDIR(st.st_mode)) {
- write_or_die(dent->d_name, strlen(dent->d_name) + 1);
- copy_event_system(sys, tps);
- }
+ write_or_die(dent->d_name, strlen(dent->d_name) + 1);
+ copy_event_system(sys, tps);
}
free(sys);
}
--
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