/*
- * taskset.c - taskset
- * Command-line utility for setting and retrieving a task's CPU affinity
- *
- * Robert Love <rml@tech9.net> 25 April 2002
- *
- * Linux kernels as of 2.5.8 provide the needed syscalls for
- * working with a task's cpu affinity. Currently 2.4 does not
- * support these syscalls, but patches are available at:
- *
- * http://www.kernel.org/pub/linux/kernel/people/rml/cpu-affinity/
+ * taskset.c - set or retrieve a task's CPU affinity
*
* This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License, v2, as
+ * it under the terms of the GNU General Public License, version 2, as
* published by the Free Software Foundation
*
* This program is distributed in the hope that it will be useful,
* 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., 675 Mass Ave, Cambridge, MA 02139, USA.
+ * 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.
*
* Copyright (C) 2004 Robert Love
+ * Copyright (C) 2010 Karel Zak <kzak@redhat.com>
*/
#include <stdio.h>
#include <stdlib.h>
#include <unistd.h>
#include <getopt.h>
-#include <sched.h>
#include <errno.h>
+#include <sched.h>
+#include <stddef.h>
#include <string.h>
-#include <ctype.h>
-#include <sys/syscall.h>
#include "cpuset.h"
+#include "nls.h"
+#include "strutils.h"
+#include "xalloc.h"
+#include "procutils.h"
+#include "c.h"
+#include "closestream.h"
+
+struct taskset {
+ pid_t pid; /* task PID */
+ cpu_set_t *set; /* task CPU mask */
+ size_t setsize;
+ char *buf; /* buffer for conversion from mask to string */
+ size_t buflen;
+ unsigned int use_list:1, /* use list rather than masks */
+ get_only:1; /* print the mask, but not modify */
+};
+
+static void __attribute__((__noreturn__)) usage(void)
+{
+ FILE *out = stdout;
+ fprintf(out,
+ _("Usage: %s [options] [mask | cpu-list] [pid|cmd [args...]]\n\n"),
+ program_invocation_short_name);
+
+ fputs(USAGE_SEPARATOR, out);
+ fputs(_("Show or change the CPU affinity of a process.\n"), out);
+ fputs(USAGE_SEPARATOR, out);
+
+ fprintf(out, _(
+ "Options:\n"
+ " -a, --all-tasks operate on all the tasks (threads) for a given pid\n"
+ " -p, --pid operate on existing given pid\n"
+ " -c, --cpu-list display and specify cpus in list format\n"
+ ));
+ printf(USAGE_HELP_OPTIONS(25));
+
+ fputs(USAGE_SEPARATOR, out);
+ fprintf(out, _(
+ "The default behavior is to run a new command:\n"
+ " %1$s 03 sshd -b 1024\n"
+ "You can retrieve the mask of an existing task:\n"
+ " %1$s -p 700\n"
+ "Or set it:\n"
+ " %1$s -p 03 700\n"
+ "List format uses a comma-separated list instead of a mask:\n"
+ " %1$s -pc 0,3,7-11 700\n"
+ "Ranges in list format can take a stride argument:\n"
+ " e.g. 0-31:2 is equivalent to mask 0x55555555\n"),
+ program_invocation_short_name);
+
+ printf(USAGE_MAN_TAIL("taskset(1)"));
+ exit(EXIT_SUCCESS);
+}
+
+static void print_affinity(struct taskset *ts, int isnew)
+{
+ char *str, *msg;
+
+ if (ts->use_list) {
+ str = cpulist_create(ts->buf, ts->buflen, ts->set, ts->setsize);
+ msg = isnew ? _("pid %d's new affinity list: %s\n") :
+ _("pid %d's current affinity list: %s\n");
+ } else {
+ str = cpumask_create(ts->buf, ts->buflen, ts->set, ts->setsize);
+ msg = isnew ? _("pid %d's new affinity mask: %s\n") :
+ _("pid %d's current affinity mask: %s\n");
+ }
+
+ if (!str)
+ errx(EXIT_FAILURE, _("internal error: conversion from cpuset to string failed"));
-static void show_usage(const char *cmd)
+ printf(msg, ts->pid ? ts->pid : getpid(), str);
+}
+
+static void __attribute__((__noreturn__)) err_affinity(pid_t pid, int set)
{
- fprintf(stderr, "taskset (%s)\n", PACKAGE_STRING);
- fprintf(stderr, "usage: %s [options] [mask | cpu-list] [pid |"\
- " cmd [args...]]\n", cmd);
- fprintf(stderr, "set or get the affinity of a process\n\n");
- fprintf(stderr, " -p, --pid "
- "operate on existing given pid\n");
- fprintf(stderr, " -c, --cpu-list "\
- "display and specify cpus in list format\n");
- fprintf(stderr, " -h, --help display this help\n");
- fprintf(stderr, " -V, --version "\
- "output version information\n\n");
- fprintf(stderr, "The default behavior is to run a new command:\n");
- fprintf(stderr, " %s 03 sshd -b 1024\n", cmd);
- fprintf(stderr, "You can retrieve the mask of an existing task:\n");
- fprintf(stderr, " %s -p 700\n", cmd);
- fprintf(stderr, "Or set it:\n");
- fprintf(stderr, " %s -p 03 700\n", cmd);
- fprintf(stderr, "List format uses a comma-separated list instead"\
- " of a mask:\n");
- fprintf(stderr, " %s -pc 0,3,7-11 700\n", cmd);
- fprintf(stderr, "Ranges in list format can take a stride argument:\n");
- fprintf(stderr, " e.g. 0-31:2 is equivalent to mask 0x55555555\n\n");
+ char *msg;
+
+ msg = set ? _("failed to set pid %d's affinity") :
+ _("failed to get pid %d's affinity");
+
+ err(EXIT_FAILURE, msg, pid ? pid : getpid());
}
-/*
- * Number of bits in a CPU bitmask on current system
- */
-static int
-max_number_of_cpus(void)
+static void do_taskset(struct taskset *ts, size_t setsize, cpu_set_t *set)
{
- int n;
- int cpus = 2048;
- size_t setsize;
- cpu_set_t *set = cpuset_alloc(cpus, &setsize, NULL);
-
- if (!set)
- goto err;
-
- for (;;) {
- CPU_ZERO_S(setsize, set);
-
- /* the library version does not return size of cpumask_t */
- n = syscall(SYS_sched_getaffinity, 0, setsize, set);
-
- if (n < 0 && errno == EINVAL && cpus < 1024*1024) {
- cpuset_free(set);
- cpus *= 2;
- set = cpuset_alloc(cpus, &setsize, NULL);
- if (!set)
- goto err;
- continue;
- }
- cpuset_free(set);
- return n*8;
+ /* read the current mask */
+ if (ts->pid) {
+ if (sched_getaffinity(ts->pid, ts->setsize, ts->set) < 0)
+ err_affinity(ts->pid, 1);
+ print_affinity(ts, FALSE);
}
-err:
- fprintf (stderr, "cannot determine NR_CPUS; aborting");
- exit(1);
- return 0;
+ if (ts->get_only)
+ return;
+
+ /* set new mask */
+ if (sched_setaffinity(ts->pid, setsize, set) < 0)
+ err_affinity(ts->pid, 1);
+
+ /* re-read the current mask */
+ if (ts->pid) {
+ if (sched_getaffinity(ts->pid, ts->setsize, ts->set) < 0)
+ err_affinity(ts->pid, 0);
+ print_affinity(ts, TRUE);
+ }
}
-int main(int argc, char *argv[])
+int main(int argc, char **argv)
{
- cpu_set_t *new_set, *cur_set;
+ cpu_set_t *new_set;
pid_t pid = 0;
- int opt, err;
- char *buf;
- int c_opt = 0;
- unsigned int ncpus;
- size_t new_setsize, cur_setsize, cur_nbits, buflen;
+ int c, all_tasks = 0;
+ int ncpus;
+ size_t new_setsize, nbits;
+ struct taskset ts;
- struct option longopts[] = {
+ static const struct option longopts[] = {
+ { "all-tasks", 0, NULL, 'a' },
{ "pid", 0, NULL, 'p' },
{ "cpu-list", 0, NULL, 'c' },
{ "help", 0, NULL, 'h' },
{ "version", 0, NULL, 'V' },
- { NULL, 0, NULL, 0 }
+ { NULL, 0, NULL, 0 }
};
- while ((opt = getopt_long(argc, argv, "+pchV", longopts, NULL)) != -1) {
- int ret = 1;
+ setlocale(LC_ALL, "");
+ bindtextdomain(PACKAGE, LOCALEDIR);
+ textdomain(PACKAGE);
+ close_stdout_atexit();
- switch (opt) {
+ memset(&ts, 0, sizeof(ts));
+
+ while ((c = getopt_long(argc, argv, "+apchV", longopts, NULL)) != -1) {
+ switch (c) {
+ case 'a':
+ all_tasks = 1;
+ break;
case 'p':
- pid = atoi(argv[argc - 1]);
+ pid = strtos32_or_err(argv[argc - 1],
+ _("invalid PID argument"));
break;
case 'c':
- c_opt = 1;
+ ts.use_list = 1;
break;
+
case 'V':
- printf("taskset (%s)\n", PACKAGE_STRING);
- return 0;
+ print_version(EXIT_SUCCESS);
case 'h':
- ret = 0;
+ usage();
default:
- show_usage(argv[0]);
- return ret;
+ errtryhelp(EXIT_FAILURE);
}
}
if ((!pid && argc - optind < 2)
- || (pid && (argc - optind < 1 || argc - optind > 2))) {
- show_usage(argv[0]);
- return 1;
+ || (pid && (argc - optind < 1 || argc - optind > 2))) {
+ warnx(_("bad usage"));
+ errtryhelp(EXIT_FAILURE);
}
- ncpus = max_number_of_cpus();
+ ncpus = get_max_number_of_cpus();
+ if (ncpus <= 0)
+ errx(EXIT_FAILURE, _("cannot determine NR_CPUS; aborting"));
/*
- * cur_mask is always used for the sched_getaffinity call
+ * the ts->set is always used for the sched_getaffinity call
* On the sched_getaffinity the kernel demands a user mask of
* at least the size of its own cpumask_t.
*/
- cur_set = cpuset_alloc(ncpus, &cur_setsize, &cur_nbits);
- if (!cur_set) {
- fprintf (stderr, "cpuset_alloc failed\n");
- exit(1);
- }
- buflen = 7 * cur_nbits;
- buf = malloc(buflen);
+ ts.set = cpuset_alloc(ncpus, &ts.setsize, &nbits);
+ if (!ts.set)
+ err(EXIT_FAILURE, _("cpuset_alloc failed"));
+
+ /* buffer for conversion from mask to string */
+ ts.buflen = 7 * nbits;
+ ts.buf = xmalloc(ts.buflen);
/*
- * new_mask is always used for the sched_setaffinity call
+ * new_set is always used for the sched_setaffinity call
* On the sched_setaffinity the kernel will zero-fill its
* cpumask_t if the user's mask is shorter.
*/
new_set = cpuset_alloc(ncpus, &new_setsize, NULL);
- if (!new_set) {
- fprintf (stderr, "cpuset_alloc failed\n");
- exit(1);
- }
-
- if (pid) {
- if (sched_getaffinity(pid, cur_setsize, cur_set) < 0) {
- perror("sched_getaffinity");
- fprintf(stderr, "failed to get pid %d's affinity\n",
- pid);
- return 1;
- }
- if (c_opt)
- printf("pid %d's current affinity list: %s\n", pid,
- cpulist_create(buf, buflen, cur_set, cur_setsize));
- else
- printf("pid %d's current affinity mask: %s\n", pid,
- cpumask_create(buf, buflen, cur_set, cur_setsize));
-
- if (argc - optind == 1)
- return 0;
- }
-
- if (c_opt)
- err = cpulist_parse(argv[optind], new_set, new_setsize);
- else
- err = cpumask_parse(argv[optind], new_set, new_setsize);
-
- if (err) {
- if (c_opt)
- fprintf(stderr, "failed to parse CPU list %s\n",
- argv[optind]);
- else
- fprintf(stderr, "failed to parse CPU mask %s\n",
- argv[optind]);
- return 1;
- }
-
- if (sched_setaffinity(pid, new_setsize, new_set) < 0) {
- perror("sched_setaffinity");
- fprintf(stderr, "failed to set pid %d's affinity.\n", pid);
- return 1;
- }
-
- if (sched_getaffinity(pid, cur_setsize, cur_set) < 0) {
- perror("sched_getaffinity");
- fprintf(stderr, "failed to get pid %d's affinity.\n", pid);
- return 1;
+ if (!new_set)
+ err(EXIT_FAILURE, _("cpuset_alloc failed"));
+
+ if (argc - optind == 1)
+ ts.get_only = 1;
+
+ else if (ts.use_list) {
+ if (cpulist_parse(argv[optind], new_set, new_setsize, 0))
+ errx(EXIT_FAILURE, _("failed to parse CPU list: %s"),
+ argv[optind]);
+ } else if (cpumask_parse(argv[optind], new_set, new_setsize)) {
+ errx(EXIT_FAILURE, _("failed to parse CPU mask: %s"),
+ argv[optind]);
}
- if (pid) {
- if (c_opt)
- printf("pid %d's new affinity list: %s\n", pid,
- cpulist_create(buf, buflen, cur_set, cur_setsize));
- else
- printf("pid %d's new affinity mask: %s\n", pid,
- cpumask_create(buf, buflen, cur_set, cur_setsize));
+ if (all_tasks && pid) {
+ struct proc_tasks *tasks = proc_open_tasks(pid);
+ while (!proc_next_tid(tasks, &ts.pid))
+ do_taskset(&ts, new_setsize, new_set);
+ proc_close_tasks(tasks);
+ } else {
+ ts.pid = pid;
+ do_taskset(&ts, new_setsize, new_set);
}
- free(buf);
- cpuset_free(cur_set);
+ free(ts.buf);
+ cpuset_free(ts.set);
cpuset_free(new_set);
if (!pid) {
argv += optind + 1;
execvp(argv[0], argv);
- perror("execvp");
- fprintf(stderr, "failed to execute %s\n", argv[0]);
- return 1;
+ errexec(argv[0]);
}
- return 0;
+ return EXIT_SUCCESS;
}
projects / thirdparty / util-linux.git / blobdiff