seqlock: change UP_DMB to UP_RMB to improve performance

read_seq Loop 20,000,000 times before 233333376 after 183333375 Signed-off-by: hujun5 <hujun5@xiaomi.com>
2026-05-31 14:27:37 +08:00 · 2025-09-18 09:24:28 +08:00
parent 9e3b852d4b
commit 65247f2603
1 changed files with 1 additions and 1 deletions
@@ -105,7 +105,7 @@ unsigned int read_seqbegin(FAR const seqcount_t *s)
  while (predict_false((seq = s->sequence) & 1));

 #ifdef CONFIG_SMP
-  UP_DMB();
+  SMP_RMB();
 #endif

  return seq;