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Add a simple utility for manipulating cpusets. Man page will be available
soon. - Lists of cpus may be specified with -l with ranges specified as low-high and commas between individual cpus and ranges. ie -l 0-2,4,6-8. - cpuset can modified -p pids, -t tids, or -s cpusetids. - cpuset can -g get the current mask for any of the above. Sponsored by: Nokia
This commit is contained in:
Jeff Roberson
parent
4da2b9d42f
commit
0d985e498d
2 changed files with 335 additions and 0 deletions
7
usr.bin/cpuset/Makefile
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7
usr.bin/cpuset/Makefile
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@ -0,0 +1,7 @@
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# $FreeBSD$
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PROG= cpuset
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NO_MAN= true
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WARNS?= 6
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.include <bsd.prog.mk>
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328
usr.bin/cpuset/cpuset.c
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328
usr.bin/cpuset/cpuset.c
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@ -0,0 +1,328 @@
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/*
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* Copyright (c) 2007, 2008 Jeffrey Roberson <jeff@freebsd.org>
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/types.h>
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#include <sys/time.h>
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#include <sys/resource.h>
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#include <sys/cpuset.h>
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#include <ctype.h>
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#include <err.h>
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#include <errno.h>
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#include <limits.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <stdint.h>
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#include <unistd.h>
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#include <string.h>
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int cflag;
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int gflag;
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int iflag;
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int lflag;
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int pflag;
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int rflag;
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int sflag;
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int tflag;
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id_t id;
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cpulevel_t level;
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cpuwhich_t which;
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void usage(void);
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static void printset(cpuset_t *mask);
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static void
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parselist(char *list, cpuset_t *mask)
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{
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enum { NONE, NUM, DASH } state;
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int lastnum;
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int curnum;
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char *l;
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state = NONE;
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curnum = lastnum = 0;
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for (l = list; *l != '\0';) {
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if (isdigit(*l)) {
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curnum = atoi(l);
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if (curnum > CPU_SETSIZE)
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errx(EXIT_FAILURE,
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"Only %d cpus supported", CPU_SETSIZE);
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while (isdigit(*l))
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l++;
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switch (state) {
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case NONE:
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lastnum = curnum;
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state = NUM;
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break;
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case DASH:
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for (; lastnum <= curnum; lastnum++)
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CPU_SET(lastnum, mask);
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state = NONE;
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break;
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case NUM:
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default:
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goto parserr;
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}
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continue;
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}
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switch (*l) {
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case ',':
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switch (state) {
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case NONE:
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break;
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case NUM:
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CPU_SET(curnum, mask);
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state = NONE;
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break;
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case DASH:
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goto parserr;
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break;
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}
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break;
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case '-':
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if (state != NUM)
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goto parserr;
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state = DASH;
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break;
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default:
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goto parserr;
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}
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l++;
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}
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switch (state) {
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case NONE:
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break;
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case NUM:
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CPU_SET(curnum, mask);
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break;
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case DASH:
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goto parserr;
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}
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return;
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parserr:
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errx(EXIT_FAILURE, "Malformed cpu list %s", list);
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}
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static void
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printset(cpuset_t *mask)
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{
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int once;
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int cpu;
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for (once = 0, cpu = 0; cpu < CPU_SETSIZE; cpu++) {
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if (CPU_ISSET(cpu, mask)) {
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if (once == 0) {
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printf("%d", cpu);
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once = 1;
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} else
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printf(", %d", cpu);
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}
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}
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printf("\n");
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}
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const char *whichnames[] = { NULL, "tid", "pid", "cpuset" };
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const char *levelnames[] = { NULL, " root", " cpuset", "" };
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static void
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printaffinity(void)
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{
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cpuset_t mask;
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if (cpuset_getaffinity(level, which, id, CPU_SETSIZE,
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&mask) != 0)
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err(EXIT_FAILURE, "getaffinity");
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printf("%s %jd%s mask: ", whichnames[which], (intmax_t)id,
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levelnames[level]);
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printset(&mask);
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exit(EXIT_SUCCESS);
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}
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static void
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printsetid(void)
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{
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cpusetid_t setid;
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/*
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* Only LEVEL_WHICH && WHICH_CPUSET has a numbered id.
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*/
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if (level == CPU_LEVEL_WHICH && !sflag)
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level = CPU_LEVEL_CPUSET;
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if (cpuset_getid(level, which, id, &setid))
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err(errno, "getid");
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printf("%s %jd%s id: %d\n", whichnames[which], (intmax_t)id,
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levelnames[level], setid);
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}
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int
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main(int argc, char *argv[])
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{
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cpusetid_t setid;
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cpuset_t mask;
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lwpid_t tid;
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pid_t pid;
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int ch;
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CPU_ZERO(&mask);
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level = CPU_LEVEL_WHICH;
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which = CPU_WHICH_PID;
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id = pid = tid = setid = -1;
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while ((ch = getopt(argc, argv, "cgil:p:rs:t:")) != -1) {
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switch (ch) {
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case 'c':
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if (rflag)
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usage();
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cflag = 1;
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level = CPU_LEVEL_CPUSET;
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break;
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case 'g':
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gflag = 1;
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break;
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case 'i':
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iflag = 1;
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break;
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case 'l':
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lflag = 1;
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parselist(optarg, &mask);
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break;
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case 'p':
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pflag = 1;
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which = CPU_WHICH_PID;
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id = pid = atoi(optarg);
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break;
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case 'r':
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if (cflag)
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usage();
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level = CPU_LEVEL_ROOT;
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rflag = 1;
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break;
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case 's':
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sflag = 1;
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which = CPU_WHICH_CPUSET;
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id = setid = atoi(optarg);
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break;
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case 't':
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tflag = 1;
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which = CPU_WHICH_TID;
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id = tid = atoi(optarg);
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break;
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default:
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usage();
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}
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}
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argc -= optind;
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argv += optind;
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if (gflag) {
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if (argc || lflag)
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usage();
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/* Only one identity specifier. */
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if (sflag + pflag + tflag > 1)
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usage();
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if (iflag)
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printsetid();
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else
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printaffinity();
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exit(EXIT_SUCCESS);
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}
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/*
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* The user wants to run a command with a set and possibly cpumask.
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*/
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if (argc) {
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if (pflag | rflag | tflag || cflag)
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usage();
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if (sflag && iflag)
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usage();
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if (sflag) {
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if (cpuset_setid(CPU_WHICH_PID, -1, setid))
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err(argc, "setid");
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which = CPU_WHICH_PID;
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level = CPU_LEVEL_WHICH;
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}
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if (iflag) {
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if (cpuset(&setid))
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err(argc, "newid");
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which = CPU_WHICH_CPUSET;
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level = CPU_LEVEL_WHICH;
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}
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if (lflag) {
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if (cpuset_setaffinity(level, which, -1,
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CPU_SETSIZE, &mask) != 0)
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err(EXIT_FAILURE, "setaffinity");
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}
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errno = 0;
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execvp(*argv, argv);
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err(errno == ENOENT ? 127 : 126, "%s", *argv);
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}
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/*
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* We're modifying something that presently exists.
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*/
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if (iflag)
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usage();
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if (!lflag && (cflag || rflag))
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usage();
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if (!lflag && !sflag)
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usage();
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/* You can only set a mask on a thread. */
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if (tflag && (sflag || pflag))
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usage();
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if (pflag && sflag) {
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if (cpuset_setid(CPU_WHICH_PID, pid, setid))
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err(EXIT_FAILURE, "setid");
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/*
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* If the user specifies a set and a list we want the mask
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* to effect the pid and not the set.
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*/
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which = CPU_WHICH_PID;
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id = pid;
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}
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if (lflag) {
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if (cpuset_setaffinity(level, which, id, CPU_SETSIZE,
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&mask) != 0)
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err(EXIT_FAILURE, "setaffinity");
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}
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exit(EXIT_SUCCESS);
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}
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void
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usage(void)
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{
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fprintf(stderr,
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"usage: cpuset [-l cpu list] [-i | -s setid] cmd ...\n");
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fprintf(stderr,
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" cpuset [-l cpu list] [-s setid] -p pid\n");
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fprintf(stderr,
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" cpuset [-cr] [-l cpu list] [-p pid | -t tid | -s setid]\n");
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fprintf(stderr,
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" cpuset [-cgir] [-p pid | -t tid | -s setid]\n");
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exit(1);
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}
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