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ARC: [plat-eznps] spinlock aware for MTM

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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 <[email protected]>
Signed-off-by: Vineet Gupta <[email protected]>
This commit is contained in:
Noam Camus 2017-05-28 09:52:05 +03:00 • committed by Vineet Gupta
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");
/*