On 05/27/2017 11:52 PM, Noam Camus wrote: > From: Noam Camus <noamca at mellanox.com> > > 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 at mellanox.com> > --- > arch/arc/include/asm/spinlock.h | 6 ++++++ > 1 files changed, 6 insertions(+), 0 deletions(-) > > diff --git a/arch/arc/include/asm/spinlock.h b/arch/arc/include/asm/spinlock.h > index 233d5ff..0a54ce7 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"); > > /* > This is ugly - I will fix it up here to create an NPS version of arch_spin_lock ! -Vineet
