diff -urN oldtree/Documentation/sysctl/kernel.txt newtree/Documentation/sysctl/kernel.txt
--- oldtree/Documentation/sysctl/kernel.txt	2006-09-17 06:36:04.000000000 -0400
+++ newtree/Documentation/sysctl/kernel.txt	2006-09-17 06:36:18.000000000 -0400
@@ -27,6 +27,7 @@
 - hostname
 - hotplug
 - interactive
+- iso_cpu
 - java-appletviewer           [ binfmt_java, obsolete ]
 - java-interpreter            [ binfmt_java, obsolete ]
 - l2cr                        [ PPC only ]
@@ -181,6 +182,14 @@
 
 ==============================================================
 
+iso_cpu:
+
+This sets the percentage cpu that the unprivileged SCHED_ISO tasks can
+run effectively at realtime priority, averaged over a rolling 3 seconds.
+Set to 80% by default.
+
+==============================================================
+
 l2cr: (PPC only)
 
 This flag controls the L2 cache of G3 processor boards. If
diff -urN oldtree/include/linux/sched.h newtree/include/linux/sched.h
--- oldtree/include/linux/sched.h	2006-09-17 06:36:04.000000000 -0400
+++ newtree/include/linux/sched.h	2006-09-17 06:36:40.000000000 -0400
@@ -34,10 +34,11 @@
 #define SCHED_FIFO		1
 #define SCHED_RR		2
 #define SCHED_BATCH		3
+#define SCHED_ISO               4
 
 #ifdef __KERNEL__
 
-#define SCHED_MAX              SCHED_BATCH
+#define SCHED_MAX              SCHED_ISO
 #define SCHED_RANGE(policy)    ((policy) <= SCHED_MAX)
 #define SCHED_RT(policy)       ((policy) == SCHED_FIFO || \
                                         (policy) == SCHED_RR)
@@ -213,7 +214,7 @@
 void io_schedule(void);
 long io_schedule_timeout(long timeout);
 #ifdef CONFIG_STAIRCASE
-extern int sched_interactive, sched_compute;
+extern int sched_interactive, sched_compute, sched_iso_cpu;
 #endif
 
 extern void cpu_init (void);
@@ -509,6 +510,7 @@
 
 #define MAX_USER_RT_PRIO	100
 #define MAX_RT_PRIO		MAX_USER_RT_PRIO
+#define ISO_PRIO                (MAX_RT_PRIO - 1)
 
 #define MAX_PRIO		(MAX_RT_PRIO + 40)
 
@@ -521,6 +523,7 @@
 #endif
 #ifdef CONFIG_STAIRCASE
 #define has_rt_policy(p)        unlikely(SCHED_RT((p)->policy))
+#define iso_task(p)             (unlikely((p)->policy == SCHED_ISO))
 #endif
 
 /* Must be high prio: stop_machine expects to yield to it. */
@@ -1146,6 +1149,7 @@
 #define PF_SWAPWRITE	0x00800000	/* Allowed to write to swap */
 #define PF_SPREAD_PAGE	0x01000000	/* Spread page cache over cpuset */
 #define PF_SPREAD_SLAB	0x02000000	/* Spread some slab caches over cpuset */
+#define PF_ISOREF       0x04000000      /* SCHED_ISO task has used up quota */
 #define PF_MEMPOLICY	0x10000000	/* Non-default NUMA mempolicy */
 #define PF_MUTEX_TESTER	0x20000000	/* Thread belongs to the rt mutex tester */
 
diff -urN oldtree/include/linux/sysctl.h newtree/include/linux/sysctl.h
--- oldtree/include/linux/sysctl.h	2006-09-17 06:36:04.000000000 -0400
+++ newtree/include/linux/sysctl.h	2006-09-17 06:36:18.000000000 -0400
@@ -155,6 +155,7 @@
 	KERN_PANIC_ON_NMI=76, /* int: whether we will panic on an unrecovered */
         KERN_INTERACTIVE=77,    /* interactive tasks can have cpu bursts */
         KERN_COMPUTE=78,        /* adjust timeslices for a compute server */
+        KERN_ISO_CPU=79,        /* percent cpu SCHED_ISO tasks run SCHED_RR */
 };
 
 
diff -urN oldtree/kernel/sysctl.c newtree/kernel/sysctl.c
--- oldtree/kernel/sysctl.c	2006-09-17 06:36:04.000000000 -0400
+++ newtree/kernel/sysctl.c	2006-09-17 06:36:18.000000000 -0400
@@ -234,6 +234,11 @@
 	{ .ctl_name = 0 }
 };
 
+/* Constants for minimum and maximum testing.
+    We use these as one-element integer vectors. */
+static int zero;
+static int one_hundred = 100;
+
 static ctl_table kern_table[] = {
 #ifndef CONFIG_UTS_NS
 	{
@@ -702,6 +707,17 @@
                 .mode           = 0644,
                 .proc_handler   = &proc_dointvec,
         },
+        {
+                .ctl_name       = KERN_ISO_CPU,
+                .procname       = "iso_cpu",
+                .data           = &sched_iso_cpu,
+                .maxlen         = sizeof (int),
+                .mode           = 0644,
+                .proc_handler   = &proc_dointvec_minmax,
+                .strategy       = &sysctl_intvec,
+                .extra1         = &zero,
+                .extra2         = &one_hundred,
+        },
 #endif
 #if defined(CONFIG_X86_LOCAL_APIC) && defined(CONFIG_X86)
 	{
@@ -803,12 +819,6 @@
 	{ .ctl_name = 0 }
 };
 
-/* Constants for minimum and maximum testing in vm_table.
-   We use these as one-element integer vectors. */
-static int zero;
-static int one_hundred = 100;
-
-
 static ctl_table vm_table[] = {
 	{
 		.ctl_name	= VM_OVERCOMMIT_MEMORY,