504 lines
9.7 KiB
C
504 lines
9.7 KiB
C
/*
|
|
* Copyright (C) 2008,2009, Steven Rostedt <srostedt@redhat.com>
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*
|
|
* This program is free software; you can redistribute it and/or modify
|
|
* it under the terms of the GNU General Public License as published by
|
|
* the Free Software Foundation; version 2 of the License (not later!)
|
|
*
|
|
* This program is distributed in the hope that it will be useful,
|
|
* but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
* GNU General Public License for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License
|
|
* along with this program; if not, write to the Free Software
|
|
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
|
|
*
|
|
* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
|
|
*/
|
|
#define _GNU_SOURCE
|
|
#include <dirent.h>
|
|
#include <mntent.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#include <string.h>
|
|
#include <stdarg.h>
|
|
#include <sys/types.h>
|
|
#include <sys/stat.h>
|
|
#include <sys/wait.h>
|
|
#include <pthread.h>
|
|
#include <fcntl.h>
|
|
#include <unistd.h>
|
|
#include <ctype.h>
|
|
#include <errno.h>
|
|
#include <stdbool.h>
|
|
#include <linux/list.h>
|
|
#include <linux/kernel.h>
|
|
|
|
#include "../perf.h"
|
|
#include "trace-event.h"
|
|
#include "debugfs.h"
|
|
#include "evsel.h"
|
|
|
|
#define VERSION "0.5"
|
|
|
|
#define _STR(x) #x
|
|
#define STR(x) _STR(x)
|
|
#define MAX_PATH 256
|
|
|
|
#define TRACE_CTRL "tracing_on"
|
|
#define TRACE "trace"
|
|
#define AVAILABLE "available_tracers"
|
|
#define CURRENT "current_tracer"
|
|
#define ITER_CTRL "trace_options"
|
|
#define MAX_LATENCY "tracing_max_latency"
|
|
|
|
unsigned int page_size;
|
|
|
|
static const char *output_file = "trace.info";
|
|
static int output_fd;
|
|
|
|
struct event_list {
|
|
struct event_list *next;
|
|
const char *event;
|
|
};
|
|
|
|
struct events {
|
|
struct events *sibling;
|
|
struct events *children;
|
|
struct events *next;
|
|
char *name;
|
|
};
|
|
|
|
|
|
|
|
static void die(const char *fmt, ...)
|
|
{
|
|
va_list ap;
|
|
int ret = errno;
|
|
|
|
if (errno)
|
|
perror("trace-cmd");
|
|
else
|
|
ret = -1;
|
|
|
|
va_start(ap, fmt);
|
|
fprintf(stderr, " ");
|
|
vfprintf(stderr, fmt, ap);
|
|
va_end(ap);
|
|
|
|
fprintf(stderr, "\n");
|
|
exit(ret);
|
|
}
|
|
|
|
void *malloc_or_die(unsigned int size)
|
|
{
|
|
void *data;
|
|
|
|
data = malloc(size);
|
|
if (!data)
|
|
die("malloc");
|
|
return data;
|
|
}
|
|
|
|
static const char *find_debugfs(void)
|
|
{
|
|
const char *path = debugfs_mount(NULL);
|
|
|
|
if (!path)
|
|
die("Your kernel not support debugfs filesystem");
|
|
|
|
return path;
|
|
}
|
|
|
|
/*
|
|
* Finds the path to the debugfs/tracing
|
|
* Allocates the string and stores it.
|
|
*/
|
|
static const char *find_tracing_dir(void)
|
|
{
|
|
static char *tracing;
|
|
static int tracing_found;
|
|
const char *debugfs;
|
|
|
|
if (tracing_found)
|
|
return tracing;
|
|
|
|
debugfs = find_debugfs();
|
|
|
|
tracing = malloc_or_die(strlen(debugfs) + 9);
|
|
|
|
sprintf(tracing, "%s/tracing", debugfs);
|
|
|
|
tracing_found = 1;
|
|
return tracing;
|
|
}
|
|
|
|
static char *get_tracing_file(const char *name)
|
|
{
|
|
const char *tracing;
|
|
char *file;
|
|
|
|
tracing = find_tracing_dir();
|
|
if (!tracing)
|
|
return NULL;
|
|
|
|
file = malloc_or_die(strlen(tracing) + strlen(name) + 2);
|
|
|
|
sprintf(file, "%s/%s", tracing, name);
|
|
return file;
|
|
}
|
|
|
|
static void put_tracing_file(char *file)
|
|
{
|
|
free(file);
|
|
}
|
|
|
|
static ssize_t calc_data_size;
|
|
|
|
static ssize_t write_or_die(const void *buf, size_t len)
|
|
{
|
|
int ret;
|
|
|
|
if (calc_data_size) {
|
|
calc_data_size += len;
|
|
return len;
|
|
}
|
|
|
|
ret = write(output_fd, buf, len);
|
|
if (ret < 0)
|
|
die("writing to '%s'", output_file);
|
|
|
|
return ret;
|
|
}
|
|
|
|
int bigendian(void)
|
|
{
|
|
unsigned char str[] = { 0x1, 0x2, 0x3, 0x4, 0x0, 0x0, 0x0, 0x0};
|
|
unsigned int *ptr;
|
|
|
|
ptr = (unsigned int *)(void *)str;
|
|
return *ptr == 0x01020304;
|
|
}
|
|
|
|
/* unfortunately, you can not stat debugfs or proc files for size */
|
|
static void record_file(const char *file, size_t hdr_sz)
|
|
{
|
|
unsigned long long size = 0;
|
|
char buf[BUFSIZ], *sizep;
|
|
off_t hdr_pos = lseek(output_fd, 0, SEEK_CUR);
|
|
int r, fd;
|
|
|
|
fd = open(file, O_RDONLY);
|
|
if (fd < 0)
|
|
die("Can't read '%s'", file);
|
|
|
|
/* put in zeros for file size, then fill true size later */
|
|
write_or_die(&size, hdr_sz);
|
|
|
|
do {
|
|
r = read(fd, buf, BUFSIZ);
|
|
if (r > 0) {
|
|
size += r;
|
|
write_or_die(buf, r);
|
|
}
|
|
} while (r > 0);
|
|
close(fd);
|
|
|
|
/* ugh, handle big-endian hdr_size == 4 */
|
|
sizep = (char*)&size;
|
|
if (bigendian())
|
|
sizep += sizeof(u64) - hdr_sz;
|
|
|
|
if (pwrite(output_fd, sizep, hdr_sz, hdr_pos) < 0)
|
|
die("writing to %s", output_file);
|
|
}
|
|
|
|
static void read_header_files(void)
|
|
{
|
|
char *path;
|
|
struct stat st;
|
|
|
|
path = get_tracing_file("events/header_page");
|
|
if (stat(path, &st) < 0)
|
|
die("can't read '%s'", path);
|
|
|
|
write_or_die("header_page", 12);
|
|
record_file(path, 8);
|
|
put_tracing_file(path);
|
|
|
|
path = get_tracing_file("events/header_event");
|
|
if (stat(path, &st) < 0)
|
|
die("can't read '%s'", path);
|
|
|
|
write_or_die("header_event", 13);
|
|
record_file(path, 8);
|
|
put_tracing_file(path);
|
|
}
|
|
|
|
static bool name_in_tp_list(char *sys, struct tracepoint_path *tps)
|
|
{
|
|
while (tps) {
|
|
if (!strcmp(sys, tps->name))
|
|
return true;
|
|
tps = tps->next;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void copy_event_system(const char *sys, struct tracepoint_path *tps)
|
|
{
|
|
struct dirent *dent;
|
|
struct stat st;
|
|
char *format;
|
|
DIR *dir;
|
|
int count = 0;
|
|
int ret;
|
|
|
|
dir = opendir(sys);
|
|
if (!dir)
|
|
die("can't read directory '%s'", sys);
|
|
|
|
while ((dent = readdir(dir))) {
|
|
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;
|
|
format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
|
|
sprintf(format, "%s/%s/format", sys, dent->d_name);
|
|
ret = stat(format, &st);
|
|
free(format);
|
|
if (ret < 0)
|
|
continue;
|
|
count++;
|
|
}
|
|
|
|
write_or_die(&count, 4);
|
|
|
|
rewinddir(dir);
|
|
while ((dent = readdir(dir))) {
|
|
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;
|
|
format = malloc_or_die(strlen(sys) + strlen(dent->d_name) + 10);
|
|
sprintf(format, "%s/%s/format", sys, dent->d_name);
|
|
ret = stat(format, &st);
|
|
|
|
if (ret >= 0)
|
|
record_file(format, 8);
|
|
|
|
free(format);
|
|
}
|
|
closedir(dir);
|
|
}
|
|
|
|
static void read_ftrace_files(struct tracepoint_path *tps)
|
|
{
|
|
char *path;
|
|
|
|
path = get_tracing_file("events/ftrace");
|
|
|
|
copy_event_system(path, tps);
|
|
|
|
put_tracing_file(path);
|
|
}
|
|
|
|
static bool system_in_tp_list(char *sys, struct tracepoint_path *tps)
|
|
{
|
|
while (tps) {
|
|
if (!strcmp(sys, tps->system))
|
|
return true;
|
|
tps = tps->next;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
static void read_event_files(struct tracepoint_path *tps)
|
|
{
|
|
struct dirent *dent;
|
|
struct stat st;
|
|
char *path;
|
|
char *sys;
|
|
DIR *dir;
|
|
int count = 0;
|
|
int ret;
|
|
|
|
path = get_tracing_file("events");
|
|
|
|
dir = opendir(path);
|
|
if (!dir)
|
|
die("can't read directory '%s'", path);
|
|
|
|
while ((dent = readdir(dir))) {
|
|
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;
|
|
count++;
|
|
}
|
|
|
|
write_or_die(&count, 4);
|
|
|
|
rewinddir(dir);
|
|
while ((dent = readdir(dir))) {
|
|
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);
|
|
if (ret >= 0) {
|
|
write_or_die(dent->d_name, strlen(dent->d_name) + 1);
|
|
copy_event_system(sys, tps);
|
|
}
|
|
free(sys);
|
|
}
|
|
|
|
closedir(dir);
|
|
put_tracing_file(path);
|
|
}
|
|
|
|
static void read_proc_kallsyms(void)
|
|
{
|
|
unsigned int size;
|
|
const char *path = "/proc/kallsyms";
|
|
struct stat st;
|
|
int ret;
|
|
|
|
ret = stat(path, &st);
|
|
if (ret < 0) {
|
|
/* not found */
|
|
size = 0;
|
|
write_or_die(&size, 4);
|
|
return;
|
|
}
|
|
record_file(path, 4);
|
|
}
|
|
|
|
static void read_ftrace_printk(void)
|
|
{
|
|
unsigned int size;
|
|
char *path;
|
|
struct stat st;
|
|
int ret;
|
|
|
|
path = get_tracing_file("printk_formats");
|
|
ret = stat(path, &st);
|
|
if (ret < 0) {
|
|
/* not found */
|
|
size = 0;
|
|
write_or_die(&size, 4);
|
|
goto out;
|
|
}
|
|
record_file(path, 4);
|
|
|
|
out:
|
|
put_tracing_file(path);
|
|
}
|
|
|
|
static struct tracepoint_path *
|
|
get_tracepoints_path(struct list_head *pattrs)
|
|
{
|
|
struct tracepoint_path path, *ppath = &path;
|
|
struct perf_evsel *pos;
|
|
int nr_tracepoints = 0;
|
|
|
|
list_for_each_entry(pos, pattrs, node) {
|
|
if (pos->attr.type != PERF_TYPE_TRACEPOINT)
|
|
continue;
|
|
++nr_tracepoints;
|
|
ppath->next = tracepoint_id_to_path(pos->attr.config);
|
|
if (!ppath->next)
|
|
die("%s\n", "No memory to alloc tracepoints list");
|
|
ppath = ppath->next;
|
|
}
|
|
|
|
return nr_tracepoints > 0 ? path.next : NULL;
|
|
}
|
|
|
|
bool have_tracepoints(struct list_head *pattrs)
|
|
{
|
|
struct perf_evsel *pos;
|
|
|
|
list_for_each_entry(pos, pattrs, node)
|
|
if (pos->attr.type == PERF_TYPE_TRACEPOINT)
|
|
return true;
|
|
|
|
return false;
|
|
}
|
|
|
|
int read_tracing_data(int fd, struct list_head *pattrs)
|
|
{
|
|
char buf[BUFSIZ];
|
|
struct tracepoint_path *tps = get_tracepoints_path(pattrs);
|
|
|
|
/*
|
|
* What? No tracepoints? No sense writing anything here, bail out.
|
|
*/
|
|
if (tps == NULL)
|
|
return -1;
|
|
|
|
output_fd = fd;
|
|
|
|
buf[0] = 23;
|
|
buf[1] = 8;
|
|
buf[2] = 68;
|
|
memcpy(buf + 3, "tracing", 7);
|
|
|
|
write_or_die(buf, 10);
|
|
|
|
write_or_die(VERSION, strlen(VERSION) + 1);
|
|
|
|
/* save endian */
|
|
if (bigendian())
|
|
buf[0] = 1;
|
|
else
|
|
buf[0] = 0;
|
|
|
|
write_or_die(buf, 1);
|
|
|
|
/* save size of long */
|
|
buf[0] = sizeof(long);
|
|
write_or_die(buf, 1);
|
|
|
|
/* save page_size */
|
|
page_size = sysconf(_SC_PAGESIZE);
|
|
write_or_die(&page_size, 4);
|
|
|
|
read_header_files();
|
|
read_ftrace_files(tps);
|
|
read_event_files(tps);
|
|
read_proc_kallsyms();
|
|
read_ftrace_printk();
|
|
|
|
return 0;
|
|
}
|
|
|
|
ssize_t read_tracing_data_size(int fd, struct list_head *pattrs)
|
|
{
|
|
ssize_t size;
|
|
int err = 0;
|
|
|
|
calc_data_size = 1;
|
|
err = read_tracing_data(fd, pattrs);
|
|
size = calc_data_size - 1;
|
|
calc_data_size = 0;
|
|
|
|
if (err < 0)
|
|
return err;
|
|
|
|
return size;
|
|
}
|