Index: usr.sbin/jail/command.c
===================================================================
--- usr.sbin/jail/command.c
+++ usr.sbin/jail/command.c
@@ -282,7 +282,7 @@
 	pid_t pid;
 	int argc, bg, clean, consfd, down, fib, i, injail, sjuser, timeout;
 #if defined(INET) || defined(INET6)
-	char *addr, *extrap, *p, *val;
+	char *addr, *extrap, *p, *val, *jid, *cpusets;
 #endif
 
 	static char *cleanenv;
@@ -574,6 +574,27 @@
 		}
 		break;
 
+	case IP_EXEC_CPUSET:
+		argv = alloca(6 * sizeof(char *));
+
+                i = snprintf(NULL, 0, "%d", j->jid);
+		jid = alloca(i+1);
+		snprintf(jid, i+1, "%d", j->jid);
+
+                i = snprintf(NULL, 0, "%s", comstring->s);
+                cpusets = alloca(i+1);
+		snprintf(cpusets, i+1, "%s", comstring->s);
+
+		if (!down) {
+			argv[0] = "/usr/bin/cpuset";
+			argv[1] = "-j";
+			argv[2] = jid;
+			argv[3] = "-l";
+			argv[4] = cpusets;
+			argv[5] = NULL;
+		}
+		break;
+
 	case IP_COMMAND:
 		if (j->name != NULL)
 			goto default_command;
Index: usr.sbin/jail/config.c
===================================================================
--- usr.sbin/jail/config.c
+++ usr.sbin/jail/config.c
@@ -66,6 +66,7 @@
     [IP_EXEC_CLEAN] =		{"exec.clean",		PF_INTERNAL | PF_BOOL},
     [IP_EXEC_CONSOLELOG] =	{"exec.consolelog",	PF_INTERNAL},
     [IP_EXEC_FIB] =		{"exec.fib",		PF_INTERNAL | PF_INT},
+    [IP_EXEC_CPUSET] =		{"exec.cpuset",		PF_INTERNAL},
     [IP_EXEC_JAIL_USER] =	{"exec.jail_user",	PF_INTERNAL},
     [IP_EXEC_POSTSTART] =	{"exec.poststart",	PF_INTERNAL},
     [IP_EXEC_POSTSTOP] =	{"exec.poststop",	PF_INTERNAL},
Index: usr.sbin/jail/jail.c
===================================================================
--- usr.sbin/jail/jail.c
+++ usr.sbin/jail/jail.c
@@ -96,6 +96,7 @@
     IP_MOUNT_PROCFS,
     IP_EXEC_PRESTART, 
     IP__OP,
+    IP_EXEC_CPUSET,
     IP_VNET_INTERFACE,
     IP_EXEC_START,
     IP_COMMAND,
Index: usr.sbin/jail/jailp.h
===================================================================
--- usr.sbin/jail/jailp.h
+++ usr.sbin/jail/jailp.h
@@ -81,6 +81,7 @@
 	IP_EXEC_CLEAN,		/* Run commands in a clean environment */
 	IP_EXEC_CONSOLELOG,	/* Redirect optput for commands run in jail */
 	IP_EXEC_FIB,		/* Run jailed commands with this FIB */
+	IP_EXEC_CPUSET,		/* List of CPUs for jail cpuset */
 	IP_EXEC_JAIL_USER,	/* Run jailed commands as this user */
 	IP_EXEC_POSTSTART,	/* Commands run outside jail after creating */
 	IP_EXEC_POSTSTOP,	/* Commands run outside jail after removing */