On Thu, May 1, 2014 at 9:39 AM, Tim Chen wrote:
> On Wed, 2014-04-30 at 20:21 -0700, Davidlohr Bueso wrote:
>
>> +
>> +static inline bool rwsem_can_spin_on_owner(struct rw_semaphore *sem)
>> +{
>> + struct task_struct *owner;
>> + bool on_cpu = true;
>> +
>> + if (need_resched())
>> +
On Wed, 2014-04-30 at 20:21 -0700, Davidlohr Bueso wrote:
> +
> +static inline bool rwsem_can_spin_on_owner(struct rw_semaphore *sem)
> +{
> + struct task_struct *owner;
> + bool on_cpu = true;
> +
> + if (need_resched())
> + return 0;
> +
> + rcu_read_lock();
> + o
We have reached the point where our mutexes are quite fine tuned
for a number of situations. This includes the use of heuristics
and optimistic spinning, based on MCS locking techniques.
Exclusive ownership of read-write semaphores are, conceptually,
just about the same as mutexes, making them clo
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