[PATCH] locking/qspinlock: Optimize pending state waiting for unlock

[guoren]

From: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>

When we're pending, we only care about lock value. The xchg_tail
wouldn't affect the pending state. That means the hardware thread
could stay in a sleep state and leaves the rest execution units'
resources of pipeline to other hardware threads. This optimization
may work only for SMT scenarios because the granularity between
cores is cache-block.

Signed-off-by: Guo Ren <guoren@xxxxxxxxxxxxxxxxx>
Signed-off-by: Guo Ren <guoren@xxxxxxxxxx>
Cc: Waiman Long <longman@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Boqun Feng <boqun.feng@xxxxxxxxx>
Cc: Will Deacon <will@xxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
---
 kernel/locking/qspinlock.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/kernel/locking/qspinlock.c b/kernel/locking/qspinlock.c
index 2b23378775fe..ebe6b8ec7cb3 100644
--- a/kernel/locking/qspinlock.c
+++ b/kernel/locking/qspinlock.c
@@ -371,7 +371,7 @@ void __lockfunc queued_spin_lock_slowpath(struct qspinlock *lock, u32 val)
 	/*
 	 * We're pending, wait for the owner to go away.
 	 *
-	 * 0,1,1 -> 0,1,0
+	 * 0,1,1 -> *,1,0
 	 *
 	 * this wait loop must be a load-acquire such that we match the
 	 * store-release that clears the locked bit and create lock
@@ -380,7 +380,7 @@ void __lockfunc queued_spin_lock_slowpath(struct qspinlock *lock, u32 val)
 	 * barriers.
 	 */
 	if (val & _Q_LOCKED_MASK)
-		atomic_cond_read_acquire(&lock->val, !(VAL & _Q_LOCKED_MASK));
+		smp_cond_load_acquire(&lock->locked, !VAL);
 
 	/*
 	 * take ownership and clear the pending bit.
-- 
2.36.1