On Wed, Jul 02, 2014 at 09:39:18PM -0700, Jason Low wrote:
> And due to padding, the additional modification below reduces the
> size of struct rw_semaphore by 64 bits on my machine :)
>
>
> struct rw_semaphore {
> long count;
> - raw_spinlock_t wait_lock;
> struct list_head wait_list;
> + raw_spinlock_t wait_lock;
> #ifdef CONFIG_SMP
> + struct optimistic_spin_tail osq; /* spinner MCS lock */
> /*
> * Write owner. Used as a speculative check to see
> * if the owner is running on the cpu.
> */
> struct task_struct *owner;
> - struct optimistic_spin_tail osq; /* spinner MCS lock */
> #endif
> #ifdef CONFIG_DEBUG_LOCK_ALLOC
> struct lockdep_map dep_map;
> Right, that might make sense.
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