1 files changed, 16 insertions, 0 deletions

diff --git a/include/linux/sched.h b/include/linux/sched.h
index 7a4de8768748..2e490271acf6 100644
--- a/include/linux/sched.h
+++ b/include/linux/sched.h
@@ -786,6 +786,22 @@ extern int partition_sched_domains(cpumask_t *partition1,
 
 #endif  /* CONFIG_SMP */
 
+/*
+ * A runqueue laden with a single nice 0 task scores a weighted_cpuload of
+ * SCHED_LOAD_SCALE. This function returns 1 if any cpu is laden with a
+ * task of nice 0 or enough lower priority tasks to bring up the
+ * weighted_cpuload
+ */
+static inline int above_background_load(void)
+{
+        unsigned long cpu;
+
+        for_each_online_cpu(cpu) {
+                if (weighted_cpuload(cpu) >= SCHED_LOAD_SCALE)
+                        return 1;
+        }
+        return 0;
+}
 
 struct io_context;                      /* See blkdev.h */
 struct cpuset;