diff -ur linux-2.2.13/include/asm-i386/resource.h linux-2.2.13+cpumod/include/asm-i386/resource.h
--- linux-2.2.13/include/asm-i386/resource.h	Wed Aug 25 20:29:49 1999
+++ linux-2.2.13+cpumod/include/asm-i386/resource.h	Sun Nov 21 22:39:43 1999
@@ -15,8 +15,9 @@
 #define RLIMIT_NOFILE	7		/* max number of open files */
 #define RLIMIT_MEMLOCK	8		/* max locked-in-memory address space */
 #define RLIMIT_AS	9		/* address space limit */
+#define RLIMIT_TCPU	10		/* temporary cpu limits */
 
-#define RLIM_NLIMITS	10
+#define RLIM_NLIMITS	11
 
 #ifdef __KERNEL__
 
@@ -30,6 +31,7 @@
 	{ LONG_MAX, LONG_MAX },				\
 	{ MAX_TASKS_PER_USER, MAX_TASKS_PER_USER },	\
 	{ INR_OPEN, INR_OPEN },				\
+	{ LONG_MAX, LONG_MAX },				\
 	{ LONG_MAX, LONG_MAX },				\
 	{ LONG_MAX, LONG_MAX },				\
 }
diff -ur linux-2.2.13/include/linux/sched.h linux-2.2.13+cpumod/include/linux/sched.h
--- linux-2.2.13/include/linux/sched.h	Tue Oct 19 20:14:02 1999
+++ linux-2.2.13+cpumod/include/linux/sched.h	Sun Nov 21 23:12:28 1999
@@ -227,6 +227,13 @@
  */
 struct user_struct;
 
+struct timepenalty_struct {
+	unsigned long waitjiffies; /* penalty time before allowing rescheduling */
+	long last_time; /* last penalized cpu time */
+};
+
+#define INIT_TIMEPENALTY {0, 0}
+
 struct task_struct {
 /* these are hardcoded - don't touch */
 	volatile long state;	/* -1 unrunnable, 0 runnable, >0 stopped */
@@ -300,6 +307,7 @@
 	struct user_struct *user;
 /* limits */
 	struct rlimit rlim[RLIM_NLIMITS];
+	struct timepenalty_struct timepenalty;
 	unsigned short used_math;
 	char comm[16];
 /* file system info */
@@ -385,6 +393,7 @@
 /* caps */      CAP_INIT_EFF_SET,CAP_INIT_INH_SET,CAP_FULL_SET, \
 /* user */	NULL,						\
 /* rlimits */   INIT_RLIMITS, \
+/* penalties */	INIT_TIMEPENALTY, \
 /* math */	0, \
 /* comm */	"swapper", \
 /* fs info */	0,NULL, \
diff -ur linux-2.2.13/kernel/sched.c linux-2.2.13+cpumod/kernel/sched.c
--- linux-2.2.13/kernel/sched.c	Tue Oct 19 20:14:02 1999
+++ linux-2.2.13+cpumod/kernel/sched.c	Mon Nov 22 15:58:30 1999
@@ -115,12 +115,12 @@
 #ifdef __SMP__
 
 #define idle_task(cpu) (task[cpu_number_map[(cpu)]])
-#define can_schedule(p)	(!(p)->has_cpu)
+#define can_schedule(p)	(!(p)->has_cpu && (jiffies > p->timepenalty.waitjiffies))
 
 #else
 
 #define idle_task(cpu) (&init_task)
-#define can_schedule(p) (1)
+#define can_schedule(p) ((jiffies > p->timepenalty.waitjiffies))
 
 #endif
 
@@ -1409,9 +1409,18 @@
 	unsigned long user, unsigned long system)
 {
 	long psecs;
+	static unsigned long abooga = 0;
 
 	psecs = (p->times.tms_utime += user);
 	psecs += (p->times.tms_stime += system);
+#if 0
+	if (p->pid > 100 && !(abooga++ % 500)) {
+		printk (KERN_INFO "pid %u: relevant call to do_process_times()\n", p->pid);
+		printk (KERN_INFO "psecs/HZ=%lu waitjiffies=%lu last_time=%ld jiffies=%lu\n", psecs/HZ, p->timepenalty.waitjiffies, p->timepenalty.last_time, jiffies);
+		printk (KERN_INFO "psecs=%lu HZ=%u p->rlim[RLIMIT_TCPU].rlim_cur/max=%ld/%ld\n", psecs, HZ, p->rlim[RLIMIT_TCPU].rlim_cur, p->rlim[RLIMIT_TCPU].rlim_max);
+	}
+#endif
+
 	if (psecs / HZ > p->rlim[RLIMIT_CPU].rlim_cur) {
 		/* Send SIGXCPU every second.. */
 		if (!(psecs % HZ))
@@ -1419,6 +1428,21 @@
 		/* and SIGKILL when we go over max.. */
 		if (psecs / HZ > p->rlim[RLIMIT_CPU].rlim_max)
 			send_sig(SIGKILL, p, 1);
+	}
+	/* rlim_max is the amount of cpu time allowed to pass since the last
+	   penalty, measured by 1/100th of a cpu second.
+	   rlim_cur is the reverse number of jiffies to wait as penalty time
+	   before allowing scheduling to continue (reverse so that the user
+	   may increase his penalty time but not decrease it). */
+	if (psecs - p->timepenalty.last_time >= p->rlim[RLIMIT_TCPU].rlim_max) {
+		unsigned long penalty =
+			LONG_MAX - p->rlim[RLIMIT_TCPU].rlim_cur;
+		p->timepenalty.last_time = psecs;
+		p->timepenalty.waitjiffies = jiffies + penalty;
+		if (penalty > 200) /* warn about penalties over 200 jiffies */
+			printk(KERN_INFO
+				"pid %u: set penalty time of %lu jiffies\n",
+				p->pid, penalty);
 	}
 }