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Commit 659d8cfb authored by Ulrich Drepper's avatar Ulrich Drepper Committed by Ingo Molnar
Browse files

perf tools: Do 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: default avatarUlrich Drepper <drepper@redhat.com>
Acked-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Cc: a.p.zijlstra@chello.nl
Cc: acme@redhat.com
Cc: eranian@google.com
Cc: fweisbec@gmail.com
Cc: lizf@cn.fujitsu.com
Cc: paulus@samba.org
Cc: xiaoguangrong@cn.fujitsu.com
LKML-Reference: <200912192140.nBJLeSfA028905@hs20-bc2-1.build.redhat.com>
[ v2: two small stylistic fixlets ]
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent fd2a50a0

tools/perf/builtin-kmem.c

+6 −11
Original line number Diff line number Diff line
@@ -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;

		}

tools/perf/util/trace-event-info.c

+23 −27
Original line number Diff line number Diff line
@@ -20,6 +20,7 @@ 
 */

#define _GNU_SOURCE

#include <dirent.h>

#include <mntent.h>

#include <stdio.h>

#include <stdlib.h>

#include <string.h>
@@ -103,28 +104,28 @@ 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)

	fp = setmntent("/proc/mounts", "r");

	if (!fp)

		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 +318,8 @@ 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 +336,8 @@ 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;
@@ -394,18 +397,12 @@ 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++;

	}
@@ -413,7 +410,8 @@ static void read_event_files(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 ||

		    strcmp(dent->d_name, "ftrace") == 0 ||

		    !system_in_tp_list(dent->d_name, tps))
@@ -422,11 +420,9 @@ 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);

		}

		}

		free(sys);

	}