search for: _qspinlock_pending

...t; _Q_TAIL_IDX_OFFSET; /* assume < 4 */ return code; } static inline struct mcs_spinlock *decode_tail(u32 code) { int cpu = (code >> _Q_TAIL_CPU_OFFSET) - 1; int idx = (code >> _Q_TAIL_IDX_OFFSET) & _Q_TAIL_IDX_MASK; return per_cpu_ptr(&mcs_nodes[idx], cpu); } #define _QSPINLOCK_PENDING (1U << _Q_PENDING_OFFSET) #define _QSPINLOCK_MASK (_QSPINLOCK_LOCKED | _QSPINLOCK_PENDING) // PENDING - enables the pending bit logic // OPT - removes one atomic op at the cost of making pending a byte // OPT2 - replaces some cmpxchg loops with unconditional atomic ops // // PENDING...

...t; _Q_TAIL_IDX_OFFSET; /* assume < 4 */ return code; } static inline struct mcs_spinlock *decode_tail(u32 code) { int cpu = (code >> _Q_TAIL_CPU_OFFSET) - 1; int idx = (code >> _Q_TAIL_IDX_OFFSET) & _Q_TAIL_IDX_MASK; return per_cpu_ptr(&mcs_nodes[idx], cpu); } #define _QSPINLOCK_PENDING (1U << _Q_PENDING_OFFSET) #define _QSPINLOCK_MASK (_QSPINLOCK_LOCKED | _QSPINLOCK_PENDING) // PENDING - enables the pending bit logic // OPT - removes one atomic op at the cost of making pending a byte // OPT2 - replaces some cmpxchg loops with unconditional atomic ops // // PENDING...

On Thu, Feb 27, 2014 at 03:42:19PM -0500, Waiman Long wrote: > >>+ old = xchg(&qlock->lock_wait, _QSPINLOCK_WAITING|_QSPINLOCK_LOCKED); > >>+ > >>+ if (old == 0) { > >>+ /* > >>+ * Got the lock, can clear the waiting bit now > >>+ */ > >>+ smp_u8_store_release(&qlock->wait, 0); > > > >So we just did an

On Thu, Feb 27, 2014 at 03:42:19PM -0500, Waiman Long wrote: > >>+ old = xchg(&qlock->lock_wait, _QSPINLOCK_WAITING|_QSPINLOCK_LOCKED); > >>+ > >>+ if (old == 0) { > >>+ /* > >>+ * Got the lock, can clear the waiting bit now > >>+ */ > >>+ smp_u8_store_release(&qlock->wait, 0); > > > >So we just did an