[PATCH v5 08/12] sched: move cfs task on a CPU with higher capacity

On 11 September 2014 12:07, Peter Zijlstra [off-list ref] wrote:

On Tue, Aug 26, 2014 at 01:06:51PM +0200, Vincent Guittot wrote:

quoted

diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index 18db43e..60ae1ce 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c

@@ -6049,6 +6049,14 @@ static bool update_sd_pick_busiest(struct lb_env *env,
                      return true;
      }

+     /*
+      * The group capacity is reduced probably because of activity from other
+      * sched class or interrupts which use part of the available capacity
+      */
+     if ((sg->sgc->capacity_orig * 100) > (sgs->group_capacity *
+                             env->sd->imbalance_pct))
+             return true;
+
      return false;
 }

This is unlikely to have worked as intended. You will never reach this,
except on PowerPC >= 7. All other machines will have bailed at the
!ASYM_PACKING check above this.

Ah yes, i miss that change while rebasing on rik patches. My use case
fall in this wider test now that we always select a busiest group