diff options
Diffstat (limited to 'kernel/sched.c')
| -rw-r--r-- | kernel/sched.c | 16 |
1 files changed, 15 insertions, 1 deletions
diff --git a/kernel/sched.c b/kernel/sched.c index 41541d79e3c..ed09d4f2a69 100644 --- a/kernel/sched.c +++ b/kernel/sched.c @@ -1294,6 +1294,10 @@ static void resched_task(struct task_struct *p) static void sched_rt_avg_update(struct rq *rq, u64 rt_delta) { } + +static void sched_avg_update(struct rq *rq) +{ +} #endif /* CONFIG_SMP */ #if BITS_PER_LONG == 32 @@ -3182,6 +3186,8 @@ static void update_cpu_load(struct rq *this_rq) this_rq->cpu_load[i] = (old_load * (scale - 1) + new_load) >> i; } + + sched_avg_update(this_rq); } static void update_cpu_load_active(struct rq *this_rq) @@ -3865,8 +3871,16 @@ int mutex_spin_on_owner(struct mutex *lock, struct thread_info *owner) /* * Owner changed, break to re-assess state. */ - if (lock->owner != owner) + if (lock->owner != owner) { + /* + * If the lock has switched to a different owner, + * we likely have heavy contention. Return 0 to quit + * optimistic spinning and not contend further: + */ + if (lock->owner) + return 0; break; + } /* * Is that owner really running on that cpu? |