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/*
* Copyright (C) 2012 Fusion-io
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public
* License v2 as published by the Free Software Foundation.
*
* 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., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*
* Parts of this file were imported from Jens Axboe's blktrace sources (also GPL)
*/
#include <sys/types.h>
#include <sys/stat.h>
#include <fcntl.h>
#include <unistd.h>
#include <stdlib.h>
#include <stdio.h>
#include <math.h>
#include <inttypes.h>
#include <string.h>
#include <asm/types.h>
#include <errno.h>
#include <sys/mman.h>
#include <time.h>
#include <signal.h>
#include <sys/wait.h>
#include <spawn.h>
#include "plot.h"
#include "blkparse.h"
#include "list.h"
#include "tracers.h"
extern char **environ;
static pid_t blktrace_pid = 0;
static pid_t mpstat_pid = 0;
static void sig_handler_for_quit(int val)
{
fprintf(stderr, "Received signal %d. Terminating tracers.\n", val);
wait_for_tracers(SIGTERM);
}
int start_blktrace(char **devices, int num_devices, char *trace_name, char *dest)
{
int ret;
int i;
char *argv[15 + MAX_DEVICES_PER_TRACE * 2];
int argc = 0;
if (!trace_name)
trace_name = "trace";
if (!dest)
dest = ".";
argv[argc++] = "blktrace";
argv[argc++] = "-b";
argv[argc++] = "8192";
argv[argc++] = "-a";
argv[argc++] = "queue";
argv[argc++] = "-a";
argv[argc++] = "complete";
argv[argc++] = "-a";
argv[argc++] = "issue";
argv[argc++] = "-a";
argv[argc++] = "notify";
if (num_devices == 1) {
argv[argc++] = "-o";
argv[argc++] = trace_name;
} else {
/* Multiple devices output to a directory named trace_name */
dest = trace_name;
}
argv[argc++] = "-D";
argv[argc++] = dest;
for (i = 0; i < num_devices; i++) {
argv[argc++] = "-d";
argv[argc++] = devices[i];
}
argv[argc] = NULL;
signal(SIGTERM, sig_handler_for_quit);
signal(SIGINT, sig_handler_for_quit);
ret = run_program(argc, argv, 0, &blktrace_pid, NULL);
return ret;
}
int wait_program(pid_t pid, const char *pname, int sig)
{
int status;
int ret = 0;
if (sig) {
ret = kill(pid, sig);
if (ret) {
fprintf(stderr, "Failed to send signal %d to %s (%lu): %s\n",
sig, pname, (long)pid, strerror(errno));
return ret;
}
fprintf(stderr, "Kill (%d): %s (%ld)\n", sig, pname, (long)pid);
}
waitpid(pid, &status, 0);
if (WIFEXITED(status)) {
ret = WEXITSTATUS(status);
if (ret == 127) /* spawnp failed after forking */
fprintf(stderr, "Failed to run '%s'\n", pname);
else
fprintf(stderr, "Exit (%d): %s\n", ret, pname);
} else if (WIFSIGNALED(status) && sig && WTERMSIG(status) != sig) {
fprintf(stderr, "'%s' killed by signal %d\n", pname, WTERMSIG(status));
ret = -1;
}
return ret;
}
int run_program(int argc, char **argv, int wait, pid_t *pid, char *outpath)
{
int i;
int err;
pid_t _pid;
posix_spawn_file_actions_t facts;
posix_spawn_file_actions_t *factp = NULL;
if (outpath != NULL) {
posix_spawn_file_actions_init(&facts);
posix_spawn_file_actions_addopen(&facts, 1, outpath, O_WRONLY|O_CREAT|O_TRUNC, 0600);
factp = &facts;
}
fprintf(stderr, "Start");
for (i = 0; i < argc; i++)
fprintf(stderr, " %s", argv[i]);
fprintf(stderr, "\n");
err = posix_spawnp(&_pid, argv[0], factp, NULL, argv, environ);
if (err != 0) {
fprintf(stderr, "Could not run '%s': %s\n", argv[0], strerror(err));
} else if (wait) {
err = wait_program(_pid, argv[0], 0);
} else if (!pid) {
fprintf(stderr, "Warning: %s (%ld): Not saving pid and not waiting for it.\n",
argv[0], (long)_pid);
} else {
*pid = _pid;
}
return err;
}
int wait_for_tracers(int sig)
{
int err;
if (blktrace_pid != 0) {
err = wait_program(blktrace_pid, "blktrace", sig);
if (err)
exit(1);
blktrace_pid = 0;
}
if (mpstat_pid != 0) {
err = wait_program(mpstat_pid, "mpstat", sig);
if (err)
exit(1);
mpstat_pid = 0;
}
return 0;
}
int start_mpstat(char *path)
{
int ret;
int argc = 4;
char *argv[] = {
"mpstat",
"-P", "ALL", "1",
NULL,
};
ret = run_program(argc, argv, 0, &mpstat_pid, path);
return ret;
}
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