Thread (113 messages) 113 messages, 8 authors, 2021-11-04

Re: [dpdk-dev] [PATCH v6 3/4] eal: use wait event scheme for mcslock

From: Mattias Rönnblom <hidden>
Date: 2021-10-27 11:16:29

On 2021-10-27 10:10, Feifei Wang wrote:
quoted hunk ↗ jump to hunk
Instead of polling for mcslock to be updated, use wait event scheme
for this case.

Signed-off-by: Feifei Wang <redacted>
Reviewed-by: Ruifeng Wang <redacted>
---
  lib/eal/include/generic/rte_mcslock.h | 9 +++++++--
  1 file changed, 7 insertions(+), 2 deletions(-)
diff --git a/lib/eal/include/generic/rte_mcslock.h b/lib/eal/include/generic/rte_mcslock.h
index 34f33c64a5..806a2b2c7e 100644
--- a/lib/eal/include/generic/rte_mcslock.h
+++ b/lib/eal/include/generic/rte_mcslock.h
@@ -116,8 +116,13 @@ rte_mcslock_unlock(rte_mcslock_t **msl, rte_mcslock_t *me)
  		/* More nodes added to the queue by other CPUs.
  		 * Wait until the next pointer is set.
  		 */
-		while (__atomic_load_n(&me->next, __ATOMIC_RELAXED) == NULL)
-			rte_pause();
+#ifdef RTE_ARCH_32
+		rte_wait_event((uint32_t *)&me->next, UINT32_MAX, ==, 0,
+				__ATOMIC_RELAXED);
+#else
+		rte_wait_event((uint64_t *)&me->next, UINT64_MAX, ==, 0,
+				__ATOMIC_RELAXED);
+#endif
  	}
  
  	/* Pass lock to next waiter. */
You could do something like

rte_wait_event((uintptr_t *)&me->next, UINTPTR_MAX, ==, 0, __ATOMIC_RELAXED);

and avoid the #ifdef.
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