On Thu, Jul 09, 2020 at 08:20:25PM +1000, Michael Ellerman wrote: > Nicholas Piggin <npiggin@xxxxxxxxx> writes: > > These have shown significantly improved performance and fairness when > > spinlock contention is moderate to high on very large systems. > > > > [ Numbers hopefully forthcoming after more testing, but initial > > results look good ] > > Would be good to have something here, even if it's preliminary. > > > Thanks to the fast path, single threaded performance is not noticably > > hurt. > > > > Signed-off-by: Nicholas Piggin <npiggin@xxxxxxxxx> > > --- > > arch/powerpc/Kconfig | 13 ++++++++++++ > > arch/powerpc/include/asm/Kbuild | 2 ++ > > arch/powerpc/include/asm/qspinlock.h | 25 +++++++++++++++++++++++ > > arch/powerpc/include/asm/spinlock.h | 5 +++++ > > arch/powerpc/include/asm/spinlock_types.h | 5 +++++ > > arch/powerpc/lib/Makefile | 3 +++ > > > include/asm-generic/qspinlock.h | 2 ++ > > Who's ack do we need for that part? Mine I suppose would do, as discussed earlier, it probably isn't required anymore, but I understand the paranoia of not wanting to change too many things at once :-) Acked-by: Peter Zijlstra (Intel) <peterz@xxxxxxxxxxxxx>
