diff -ru linux-2.2/Documentation/Configure.help linux-2.2-IDLE/Documentation/Configure.help
--- linux-2.2/Documentation/Configure.help	Tue Jan 26 18:40:04 1999
+++ linux-2.2-IDLE/Documentation/Configure.help	Tue Jan 26 18:16:16 1999
@@ -1437,6 +1437,14 @@
   user level program to do useful things with this information. This
   is generally a good idea, so say Y.
   
+IDLE scheduling class
+CONFIG_SCHED_IDLE
+  This option will create an additional scheduling class that
+  may be used to run background process (such as distributed.net)
+  without degrading system performance.  If any other processes
+  desire CPU resources, processes running with the SCHED_IDLE 
+  scheduling class will be starved off the CPU.
+
 Sysctl support
 CONFIG_SYSCTL
   The sysctl interface provides a means of dynamically changing
diff -ru linux-2.2/arch/i386/config.in linux-2.2-IDLE/arch/i386/config.in
--- linux-2.2/arch/i386/config.in	Tue Jan 26 18:40:22 1999
+++ linux-2.2-IDLE/arch/i386/config.in	Tue Jan 26 14:41:47 1999
@@ -83,6 +83,7 @@
 
 bool 'System V IPC' CONFIG_SYSVIPC
 bool 'BSD Process Accounting' CONFIG_BSD_PROCESS_ACCT
+bool 'IDLE scheduling class' CONFIG_SCHED_IDLE
 bool 'Sysctl support' CONFIG_SYSCTL
 tristate 'Kernel support for a.out binaries' CONFIG_BINFMT_AOUT
 tristate 'Kernel support for ELF binaries' CONFIG_BINFMT_ELF
diff -ru linux-2.2/arch/ppc/config.in linux-2.2-IDLE/arch/ppc/config.in
--- linux-2.2/arch/ppc/config.in	Tue Jan 26 18:40:42 1999
+++ linux-2.2-IDLE/arch/ppc/config.in	Tue Jan 26 14:42:08 1999
@@ -57,6 +57,7 @@
 bool 'Sysctl support' CONFIG_SYSCTL
 bool 'System V IPC' CONFIG_SYSVIPC
 bool 'BSD Process Accounting' CONFIG_BSD_PROCESS_ACCT
+bool 'IDLE scheduling class' CONFIG_SCHED_IDLE
 
 # only elf supported, a.out is not -- Cort
 define_bool CONFIG_BINFMT_ELF y
diff -ru linux-2.2/include/linux/sched.h linux-2.2-IDLE/include/linux/sched.h
--- linux-2.2/include/linux/sched.h	Tue Jan 26 18:43:26 1999
+++ linux-2.2-IDLE/include/linux/sched.h	Tue Jan 26 16:56:06 1999
@@ -87,6 +87,20 @@
 #define SCHED_FIFO		1
 #define SCHED_RR		2
 
+
+#ifdef CONFIG_SCHED_IDLE
+#define SCHED_IDLE		3
+
+/* 
+ * Scheduling priority values
+ */
+#define SCHED_RR_PRIORITY	1000
+#define SCHED_FIFO_PRIORITY	1000
+#define SCHED_OTHER_PRIORITY	500
+#define SCHED_IDLE_PRIORITY	0
+
+#endif /* CONFIG_SCHED_IDLE */
+
 /*
  * This is an additional bit set when we want to
  * yield the CPU for one re-schedule..
diff -ru linux-2.2/kernel/sched.c linux-2.2-IDLE/kernel/sched.c
--- linux-2.2/kernel/sched.c	Tue Jan 26 18:43:34 1999
+++ linux-2.2-IDLE/kernel/sched.c	Tue Jan 26 17:15:16 1999
@@ -350,8 +350,14 @@
 	 * runqueue (taking priorities within processes
 	 * into account).
 	 */
-	if (policy != SCHED_OTHER)
+	if (policy == SCHED_RR || policy == SCHED_FIFO)
 		return 1000 + p->rt_priority;
+/*  WIP  CONFIG_SCHED_IDLE
+	if (policy == SCHED_RR )
+		return SCHED_RR_PRIORITY + p->rt_priority;
+	else if (policy == SCHED_FIFO)
+		return SCHED_FIFO_PRIORITY + p->rt_priority;
+*/
 
 	/*
 	 * Give the process a first-approximation goodness value
@@ -376,7 +382,14 @@
 		weight += p->priority;
 	}
 
+#ifdef CONFIG_SCHED_IDLE
+	if (policy == SCHED_OTHER)
+		return SCHED_OTHER_PRIORITY + weight;
+	else
+		return SCHED_IDLE_PRIORITY + weight;
+#else
 	return weight;
+#endif /* CONFIG_SCHED_IDLE */
 }
 
 /*
@@ -716,7 +729,11 @@
 			}
 
 			/* Do we need to re-calculate counters? */
+#ifdef CONFIG_SCHED_IDLE
+			if (c <= SCHED_OTHER_PRIORITY) {
+#else
 			if (!c) {
+#endif
 				struct task_struct *p;
 				read_lock(&tasklist_lock);
 				for_each_task(p)
@@ -1621,7 +1638,11 @@
 	else {
 		retval = -EINVAL;
 		if (policy != SCHED_FIFO && policy != SCHED_RR &&
-				policy != SCHED_OTHER)
+				policy != SCHED_OTHER
+#ifdef CONFIG_SCHED_IDLE
+				&& policy != SCHED_IDLE
+#endif
+				)
 			goto out_unlock;
 	}