These patches improve performance of idle sleep and wake. The first patches rework the lazy-irq handling of idle code a bit to make it simpler first.
Any review would be welcome. I've tested this with some performance and simple correctness tests on POWER8, POWER9, and with KVM on POWER8, so it's about ready to review now I hope. Thanks, Nick Nicholas Piggin (14): powerpc/64s: idle move soft interrupt mask logic into C code powerpc/64s: idle hotplug lazy-irq simplification powerpc/64s: idle provide a default idle for POWER9 powerpc/64s: idle process interrupts from system reset wakeup powerpc/64s: msgclr when handling doorbell exceptions powerpc/64s: interrupt replay balance the return branch predictor powerpc/64s: idle branch to handler with virtual mode offset powerpc/64s: idle avoid SRR usage in idle sleep/wake paths powerpc/64s: idle hmi wakeup is unlikely powerpc/64s: cpuidle set polling before enabling irqs powerpc/64s: cpuidle read mostly for common globals powerpc/64s: cpuidle no memory barrier after break from idle powerpc/64: runlatch CTRL[RUN] set optimisation powerpc/64s: idle runlatch switch is done with MSR[EE]=0 arch/powerpc/include/asm/dbell.h | 13 +++ arch/powerpc/include/asm/exception-64s.h | 17 +++- arch/powerpc/include/asm/hw_irq.h | 1 + arch/powerpc/include/asm/machdep.h | 1 + arch/powerpc/include/asm/ppc-opcode.h | 3 + arch/powerpc/include/asm/processor.h | 10 +-- arch/powerpc/kernel/asm-offsets.c | 1 + arch/powerpc/kernel/exceptions-64s.S | 62 ++++++++++++-- arch/powerpc/kernel/idle_book3s.S | 137 +++++++++---------------------- arch/powerpc/kernel/irq.c | 3 +- arch/powerpc/kernel/process.c | 12 +-- arch/powerpc/kvm/book3s_hv_rmhandlers.S | 8 +- arch/powerpc/platforms/powernv/idle.c | 104 +++++++++++++++++++---- arch/powerpc/platforms/powernv/smp.c | 31 ++++--- arch/powerpc/platforms/powernv/subcore.c | 3 +- drivers/cpuidle/cpuidle-powernv.c | 37 +++++---- drivers/cpuidle/cpuidle-pseries.c | 22 +++-- 17 files changed, 288 insertions(+), 177 deletions(-) -- 2.11.0