diff mbox series

[v7,4/7] ticketlock: use new API to reduce contention on aarch64

Message ID 1569562904-43950-5-git-send-email-gavin.hu@arm.com (mailing list archive)
State Superseded, archived
Delegated to: David Marchand
Headers show
Series use WFE for aarch64 | expand

Checks

Context Check Description
ci/Intel-compilation success Compilation OK
ci/checkpatch success coding style OK

Commit Message

Gavin Hu Sept. 27, 2019, 5:41 a.m. UTC
While using ticket lock, cores repeatedly poll the lock variable.
This is replaced by rte_wait_until_equal API.

Running ticketlock_autotest on ThunderX2, Ampere eMAG80, and Arm N1SDP[1],
there were variances between runs, but no notable performance gain or
degradation were seen with and without this patch.

[1] https://community.arm.com/developer/tools-software/oss-platforms/w/\
docs/440/neoverse-n1-sdp

Signed-off-by: Gavin Hu <gavin.hu@arm.com>
Reviewed-by: Honnappa Nagarahalli <honnappa.nagarahalli@arm.com>
Tested-by: Phil Yang <phil.yang@arm.com>
Tested-by: Pavan Nikhilesh <pbhagavatula@marvell.com>
Reviewed-by: Jerin Jacob <jerinj@marvell.com>
---
 lib/librte_eal/common/include/generic/rte_ticketlock.h | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/lib/librte_eal/common/include/generic/rte_ticketlock.h b/lib/librte_eal/common/include/generic/rte_ticketlock.h
index d9bec87..232bbe9 100644
--- a/lib/librte_eal/common/include/generic/rte_ticketlock.h
+++ b/lib/librte_eal/common/include/generic/rte_ticketlock.h
@@ -66,8 +66,7 @@  static inline 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_equal_acquire_16(&tl->s.current, me);
 }
 
 /**