From 1112c3b2ce5281a7118606648bb8cc010b2499ca Mon Sep 17 00:00:00 2001 From: Noam Camus Date: Sun, 28 May 2017 09:52:05 +0300 Subject: [PATCH] ARC: [plat-eznps] spinlock aware for MTM This way when we execute "ex" during trying to hold lock we can switch to other HW thread and utilize the core intead of just spinning on a lock. We noticed about 10% improvement of execution time with hackbench test. Signed-off-by: Noam Camus Signed-off-by: Vineet Gupta --- arch/arc/include/asm/spinlock.h | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/arch/arc/include/asm/spinlock.h b/arch/arc/include/asm/spinlock.h index 968c730..193c9eb 100644 --- a/arch/arc/include/asm/spinlock.h +++ b/arch/arc/include/asm/spinlock.h @@ -252,9 +252,15 @@ static inline void arch_spin_lock(arch_spinlock_t *lock) __asm__ __volatile__( "1: ex %0, [%1] \n" +#ifdef CONFIG_EZNPS_MTM_EXT + " .word %3 \n" +#endif " breq %0, %2, 1b \n" : "+&r" (val) : "r"(&(lock->slock)), "ir"(__ARCH_SPIN_LOCK_LOCKED__) +#ifdef CONFIG_EZNPS_MTM_EXT + , "i"(CTOP_INST_SCHD_RW) +#endif : "memory"); /* -- 2.7.4