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authorGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-06-07 15:44:59 +0000
committerGravatar Bernhard Reutner-Fischer <rep.dot.nop@gmail.com>2006-06-07 15:44:59 +0000
commit16d3e4e0aff2371d0bcfd7b2c19d5bc253302f73 (patch)
tree3945b0f4e0293206ac4969a79b73112b9ce29e85
parentea93f8a397772e515fb54f6051836218112abf3f (diff)
downloadbusybox-16d3e4e0aff2371d0bcfd7b2c19d5bc253302f73.tar.gz
busybox-16d3e4e0aff2371d0bcfd7b2c19d5bc253302f73.tar.bz2
- 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
-rw-r--r--include/applets.h1
-rw-r--r--include/usage.h17
-rw-r--r--miscutils/Config.in6
-rw-r--r--miscutils/Makefile.in1
-rw-r--r--miscutils/taskset.c67
-rwxr-xr-xtestsuite/taskset.tests17
6 files changed, 109 insertions, 0 deletions
diff --git a/include/applets.h b/include/applets.h
index d020c5f89..c9d5ac162 100644
--- a/include/applets.h
+++ b/include/applets.h
@@ -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))
diff --git a/include/usage.h b/include/usage.h
index 239bbb373..9bdfb3fe0 100644
--- a/include/usage.h
+++ b/include/usage.h
@@ -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 \
diff --git a/miscutils/Config.in b/miscutils/Config.in
index fc90b5447..37c1de8b9 100644
--- a/miscutils/Config.in
+++ b/miscutils/Config.in
@@ -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
diff --git a/miscutils/Makefile.in b/miscutils/Makefile.in
index a0b6b7233..d60d687b0 100644
--- a/miscutils/Makefile.in
+++ b/miscutils/Makefile.in
@@ -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
diff --git a/miscutils/taskset.c b/miscutils/taskset.c
new file mode 100644
index 000000000..a72f3ff53
--- /dev/null
+++ b/miscutils/taskset.c
@@ -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);
+}
diff --git a/testsuite/taskset.tests b/testsuite/taskset.tests
new file mode 100755
index 000000000..6001c3e32
--- /dev/null
+++ b/testsuite/taskset.tests
@@ -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