diff options
| -rw-r--r-- | kernel/sched/fair.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c index 58f2228f4820..c4be6e7e1a33 100644 --- a/kernel/sched/fair.c +++ b/kernel/sched/fair.c @@ -5399,6 +5399,13 @@ static int wake_affine(struct sched_domain *sd, struct task_struct *p, this_load = target_load(this_cpu, idx); /* + * Common case: CPUs are in the same socket, and select_idle_sibling() + * will do its thing regardless of what we return: + */ + if (cpus_share_cache(prev_cpu, this_cpu)) + return true; + + /* * If sync wakeup then subtract the (maximum possible) * effect of the currently running task from the load * of the current CPU: @@ -5986,11 +5993,15 @@ select_task_rq_fair(struct task_struct *p, int prev_cpu, int sd_flag, int wake_f if (affine_sd) { sd = NULL; /* Prefer wake_affine over balance flags */ - if (cpu != prev_cpu && wake_affine(affine_sd, p, prev_cpu, sync)) + if (cpu == prev_cpu) + goto pick_cpu; + + if (wake_affine(affine_sd, p, prev_cpu, sync)) new_cpu = cpu; } if (!sd) { + pick_cpu: if (sd_flag & SD_BALANCE_WAKE) /* XXX always ? */ new_cpu = select_idle_sibling(p, prev_cpu, new_cpu); |