From: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx>
Flushing the write buffer brings aroung 10% performace on the tight
uncontended spinlock loops on Octeon. Refer to commit 500c2e1fdbcc
("MIPS: Optimize spinlocks.").
Signed-off-by: Alexander Sverdlin <alexander.sverdlin@xxxxxxxxx>
---
arch/mips/include/asm/spinlock.h | 3 +++
1 file changed, 3 insertions(+)
diff --git a/arch/mips/include/asm/spinlock.h b/arch/mips/include/asm/spinlock.h
index 8a88eb2..0a707f3 100644
--- a/arch/mips/include/asm/spinlock.h
+++ b/arch/mips/include/asm/spinlock.h
@@ -24,6 +24,9 @@ static inline void queued_spin_unlock(struct qspinlock *lock)
/* This could be optimised with ARCH_HAS_MMIOWB */
mmiowb();
smp_store_release(&lock->locked, 0);
+#ifdef CONFIG_CPU_CAVIUM_OCTEON
+ nudge_writes();
+#endif
}
#include <asm/qspinlock.h>
--
2.10.2
