- add applet taskset to set/retrieve the CPU affinity of a process

text    data     bss     dec     hex filename
    584       0       0     584     248 taskset.o.gcc-2.95
    509       0       0     509     1fd taskset.o.gcc-3.3
    505       0       0     505     1f9 taskset.o.gcc-3.4
    506       0       0     506     1fa taskset.o.gcc-4.0
    498       0       0     498     1f2 taskset.o.gcc-4.1
    495       0       0     495     1ef taskset.o.gcc-4.2-HEAD
This commit is contained in:
Bernhard Reutner-Fischer 2006-06-07 15:44:59 +00:00
parent ea93f8a397
commit 16d3e4e0af
6 changed files with 109 additions and 0 deletions

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@ -262,6 +262,7 @@ USE_BB_SYSCTL(APPLET(sysctl, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_SYSLOGD(APPLET(syslogd, _BB_DIR_SBIN, _BB_SUID_NEVER))
USE_TAIL(APPLET(tail, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_TAR(APPLET(tar, _BB_DIR_BIN, _BB_SUID_NEVER))
USE_TASKSET(APPLET(taskset, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_TEE(APPLET(tee, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_TELNET(APPLET(telnet, _BB_DIR_USR_BIN, _BB_SUID_NEVER))
USE_TELNETD(APPLET(telnetd, _BB_DIR_USR_SBIN, _BB_SUID_NEVER))

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@ -2955,6 +2955,23 @@ USE_FEATURE_DATE_ISOFMT( \
"$ zcat /tmp/tarball.tar.gz | tar -xf -\n" \
"$ tar -cf /tmp/tarball.tar /usr/local\n"
#define taskset_trivial_usage \
"[OPTIONS] [mask] [pid | command [arg]...]"
#define taskset_full_usage \
"Set or get CPU affinity.\n\n" \
"Options:\n" \
"\t-p\toperate on an existing PID"
#define taskset_example_usage \
"$ taskset 0x7 ./dgemm_test&\n" \
"$ taskset -p 0x1 $!\n" \
"pid 4790's current affinity mask: 7\n" \
"pid 4790's new affinity mask: 1\n" \
"$ taskset 0x7 /bin/sh -c './taskset -p 0x1 $$'\n" \
"pid 6671's current affinity mask: 1\n" \
"pid 6671's new affinity mask: 1\n" \
"$ taskset -p 1\n"
"pid 1's current affinity mask: 3\n"
#define tee_trivial_usage \
"[OPTION]... [FILE]..."
#define tee_full_usage \

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@ -291,6 +291,12 @@ config CONFIG_SETSID
help
setsid runs a program in a new session
config CONFIG_TASKSET
bool "taskset"
default n
help
Retrieve or set a processes's CPU affinity (on linux)
config CONFIG_TIME
bool "time"
default n

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@ -28,6 +28,7 @@ MISCUTILS-$(CONFIG_RUNLEVEL) += runlevel.o
MISCUTILS-$(CONFIG_RX) += rx.o
MISCUTILS-$(CONFIG_SETSID) += setsid.o
MISCUTILS-$(CONFIG_STRINGS) += strings.o
MISCUTILS-$(CONFIG_TASKSET) += taskset.o
MISCUTILS-$(CONFIG_TIME) += time.o
MISCUTILS-$(CONFIG_WATCHDOG) += watchdog.o

67
miscutils/taskset.c Normal file
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@ -0,0 +1,67 @@
/* vi: set sw=4 ts=4: */
/*
* taskset - retrieve or set a processes's CPU affinity
* Copyright (c) 2006 Bernhard Fischer
*
* Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
*/
#include "busybox.h"
#include <sched.h>
#include <unistd.h>
#include <getopt.h> /* optind */
int taskset_main(int argc, char** argv)
{
cpu_set_t mask, new_mask;
pid_t pid = 0;
unsigned long ul;
const char *state = "current\0new";
char *p_opt = NULL, *aff = NULL;
ul = bb_getopt_ulflags(argc, argv, "+p:", &p_opt);
#define TASKSET_OPT_p (1)
if (ul & TASKSET_OPT_p) {
if (argc == optind+1) { /* -p <aff> <pid> */
aff = p_opt;
p_opt = argv[optind];
}
argv += optind; /* me -p <arg> */
pid = bb_xgetularg10_bnd(p_opt, 1, ULONG_MAX); /* -p <pid> */
} else
aff = *++argv; /* <aff> <cmd...> */
if (aff) {
/* to_cpuset(bb_xgetularg_bnd(aff, 16, 1, ULONG_MAX), &new_mask); */
unsigned i = 0;
unsigned long l = bb_xgetularg_bnd(aff, 16, 1, ULONG_MAX);
CPU_ZERO(&new_mask);
while (i < CPU_SETSIZE && l >= (1<<i)) {
if ((1<<i) & l)
CPU_SET(i, &new_mask);
++i;
}
}
if (ul & TASKSET_OPT_p) {
print_aff:
if (sched_getaffinity(pid, sizeof (mask), &mask) < 0)
bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 'g', pid);
bb_printf("pid %d's %s affinity mask: %x\n", /* %x .. perhaps _FANCY */
pid, state, mask);
if (!*argv) /* no new affinity given or we did print already, done. */
return EXIT_SUCCESS;
}
if (sched_setaffinity(pid, sizeof (new_mask), &new_mask))
bb_perror_msg_and_die("Failed to %cet pid %d's affinity", 's', pid);
if (ul & TASKSET_OPT_p) {
state += 8;
++argv;
goto print_aff;
}
++argv;
execvp(*argv, argv);
bb_perror_msg_and_die("%s", *argv);
}

17
testsuite/taskset.tests Executable file
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@ -0,0 +1,17 @@
#!/bin/sh
# Copyright 2006 Bernhard Fischer
# Licensed under GPL v2 or later, see file LICENSE for details.
. testing.sh
a="taskset"
# testing "test name" "opts" "expected result" "file inp" "stdin"
testing "taskset (get from pid 1)" "$a -p1 >/dev/null;echo \$?" "0\n" "" ""
testing "taskset (invalid pid)" "$a -p0 >/dev/null 2>&1;echo \$?" "1\n" "" ""
testing "taskset (set_aff, needs CAP_SYS_NICE)" \
"$a 0x1 $SHELL -c $a\ -p\ \$$\|grep\ \"current\ affinity\ mask:\ 1\" >/dev/null;echo \$?" \
"0\n" "" ""
unset a
exit $FAILCOUNT