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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 <noamca@mellanox.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
This commit is contained in:
Noam Camus 2017-05-28 09:52:05 +03:00 committed by Vineet Gupta
parent c2bdac146b
commit 1112c3b2ce
1 changed files with 6 additions and 0 deletions
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6
arch/arc/include/asm/spinlock.h
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@ -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");
/*