>>> On 18.12.15 at 11:06, wrote:
> @@ -492,6 +494,50 @@ int _rw_is_write_locked(rwlock_t *lock)
> return (lock->lock == RW_WRITE_FLAG); /* writer in critical section? */
> }
>
> +void _percpu_write_lock(percpu_rwlock_t **per_cpudata,
> +percpu_rwlock_t *percpu_rwlock)
> +{
Per-cpu read-write locks allow for the fast path read case to have
low overhead by only setting/clearing a per-cpu variable for using
the read lock. The per-cpu read fast path also avoids locked
compare swap operations which can be particularly slow on coherent
multi-socket systems, particularly if
