1 files changed, 10 insertions, 5 deletions

diff --git a/kernel/sched.c b/kernel/sched.c
index 589e55a422..7b37193111 100644
--- a/kernel/sched.c
+++ b/kernel/sched.c
@@ -700,14 +700,19 @@ static int recalc_task_prio(task_t *p, unsigned long long now)
         if (likely(sleep_time > 0)) {
                 /*
                  * User tasks that sleep a long time are categorised as
-                 * idle and will get just interactive status to stay active &
-                 * prevent them suddenly becoming cpu hogs and starving
-                 * other processes.
+                 * idle. They will only have their sleep_avg increased to a
+                 * level that makes them just interactive priority to stay
+                 * active yet prevent them suddenly becoming cpu hogs and
+                 * starving other processes.
                  */
                 if (p->mm && p->sleep_type != SLEEP_NONINTERACTIVE &&
                         sleep_time > INTERACTIVE_SLEEP(p)) {
-                                p->sleep_avg = JIFFIES_TO_NS(MAX_SLEEP_AVG -
-                                                DEF_TIMESLICE);
+                                unsigned long ceiling;
+
+                                ceiling = JIFFIES_TO_NS(MAX_SLEEP_AVG -
+                                        DEF_TIMESLICE);
+                                if (p->sleep_avg < ceiling)
+                                        p->sleep_avg = ceiling;
                 } else {
                         /*
                          * Tasks waking from uninterruptible sleep are