x86/NUMA: Provide a range-to-target_node lookup facility

[linux-2.6-microblaze.git] / kernel / sched / pelt.c

diff --git a/kernel/sched/pelt.c b/kernel/sched/pelt.c
index a96db50..bd006b7 100644 (file)
--- a/kernel/sched/pelt.c
+++ b/kernel/sched/pelt.c
@@ -129,8 +129,20 @@ accumulate_sum(u64 delta, struct sched_avg *sa,
                 * Step 2
                 */
                delta %= 1024;
-               contrib = __accumulate_pelt_segments(periods,
-                               1024 - sa->period_contrib, delta);
+               if (load) {
+                       /*
+                        * This relies on the:
+                        *
+                        * if (!load)
+                        *      runnable = running = 0;
+                        *
+                        * clause from ___update_load_sum(); this results in
+                        * the below usage of @contrib to dissapear entirely,
+                        * so no point in calculating it.
+                        */
+                       contrib = __accumulate_pelt_segments(periods,
+                                       1024 - sa->period_contrib, delta);
+               }
        }
        sa->period_contrib = delta;
 
@@ -205,7 +217,9 @@ ___update_load_sum(u64 now, struct sched_avg *sa,
         * This means that weight will be 0 but not running for a sched_entity
         * but also for a cfs_rq if the latter becomes idle. As an example,
         * this happens during idle_balance() which calls
-        * update_blocked_averages()
+        * update_blocked_averages().
+        *
+        * Also see the comment in accumulate_sum().
         */
        if (!load)
                runnable = running = 0;