[dpdk-dev] [RFC v2 2/5] ticketlock: use new API to reduce contention on aarch64

[Gavin Hu]

While using ticket lock, cores repeatedly poll the lock variable.
This is replaced by rte_wait_until_equal API.

Running ticketlock_autotest on ThunderX2, with different numbers of cores
and depths of rings, 3%~8% performance gains were measured.

Signed-off-by: Gavin Hu <gavin.hu at arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli at arm.com>
---
 lib/librte_eal/common/include/generic/rte_ticketlock.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/lib/librte_eal/common/include/generic/rte_ticketlock.h b/lib/librte_eal/common/include/generic/rte_ticketlock.h
index 191146f..8fa1f62 100644
--- a/lib/librte_eal/common/include/generic/rte_ticketlock.h
+++ b/lib/librte_eal/common/include/generic/rte_ticketlock.h
@@ -64,8 +64,7 @@ static inline __rte_experimental void
 rte_ticketlock_lock(rte_ticketlock_t *tl)
 {
 	uint16_t me = __atomic_fetch_add(&tl->s.next, 1, __ATOMIC_RELAXED);
-	while (__atomic_load_n(&tl->s.current, __ATOMIC_ACQUIRE) != me)
-		rte_pause();
+	rte_wait_until_equal16(&tl->s.current, me, __ATOMIC_ACQUIRE);
 }
 
 /**
-- 
2.7.4