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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org Okanovic, Haris writes: > On Tue, 2024-04-30 at 11:37 -0700, Ankur Arora wrote: >> CAUTION: This email originated from outside of the organization. Do not click links or open attachments unless you can confirm the sender and know the content is safe. >> >> >> >> Add architectural support for the cpuidle-haltpoll driver by defining >> arch_haltpoll_*(). Also select ARCH_HAS_OPTIMIZED_POLL since we have >> an optimized polling mechanism via smp_cond_load*(). >> >> Add the configuration option, ARCH_CPUIDLE_HALTPOLL to allow >> cpuidle-haltpoll to be selected. >> >> Note that we limit cpuidle-haltpoll support to when the event-stream is >> available. This is necessary because polling via smp_cond_load_relaxed() >> uses WFE to wait for a store which might not happen for an prolonged >> period of time. So, ensure the event-stream is around to provide a >> terminating condition. >> >> Signed-off-by: Ankur Arora >> --- >> arch/arm64/Kconfig | 10 ++++++++++ >> arch/arm64/include/asm/cpuidle_haltpoll.h | 21 +++++++++++++++++++++ >> 2 files changed, 31 insertions(+) >> create mode 100644 arch/arm64/include/asm/cpuidle_haltpoll.h >> >> diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig >> index 7b11c98b3e84..6f2df162b10e 100644 >> --- a/arch/arm64/Kconfig >> +++ b/arch/arm64/Kconfig >> @@ -34,6 +34,7 @@ config ARM64 >> select ARCH_HAS_MEMBARRIER_SYNC_CORE >> select ARCH_HAS_NMI_SAFE_THIS_CPU_OPS >> select ARCH_HAS_NON_OVERLAPPING_ADDRESS_SPACE >> + select ARCH_HAS_OPTIMIZED_POLL >> select ARCH_HAS_PTE_DEVMAP >> select ARCH_HAS_PTE_SPECIAL >> select ARCH_HAS_HW_PTE_YOUNG >> @@ -2331,6 +2332,15 @@ config ARCH_HIBERNATION_HEADER >> config ARCH_SUSPEND_POSSIBLE >> def_bool y >> >> +config ARCH_CPUIDLE_HALTPOLL >> + bool "Enable selection of the cpuidle-haltpoll driver" >> + default n >> + help >> + cpuidle-haltpoll allows for adaptive polling based on >> + current load before entering the idle state. >> + >> + Some virtualized workloads benefit from using it. >> + >> endmenu # "Power management options" >> >> menu "CPU Power Management" >> diff --git a/arch/arm64/include/asm/cpuidle_haltpoll.h b/arch/arm64/include/asm/cpuidle_haltpoll.h >> new file mode 100644 >> index 000000000000..a79bdec7f516 >> --- /dev/null >> +++ b/arch/arm64/include/asm/cpuidle_haltpoll.h >> @@ -0,0 +1,21 @@ >> +/* SPDX-License-Identifier: GPL-2.0 */ >> +#ifndef _ASM_HALTPOLL_H >> +#define _ASM_HALTPOLL_H >> + >> +static inline void arch_haltpoll_enable(unsigned int cpu) >> +{ >> +} >> + >> +static inline void arch_haltpoll_disable(unsigned int cpu) >> +{ >> +} >> + >> +static inline bool arch_haltpoll_supported(void) >> +{ >> + /* >> + * Ensure the event stream is available to provide a terminating >> + * condition to the WFE in the poll loop. >> + */ >> + return arch_timer_evtstrm_available(); > > Note this fails build when CONFIG_HALTPOLL_CPUIDLE=m (module): > > ERROR: modpost: "arch_cpu_idle" [drivers/cpuidle/cpuidle-haltpoll.ko] > undefined! > ERROR: modpost: "arch_timer_evtstrm_available" > [drivers/cpuidle/cpuidle-haltpoll.ko] undefined! > make[2]: *** [scripts/Makefile.modpost:145: Module.symvers] Error 1 > make[1]: *** [/home/ubuntu/linux/Makefile:1886: modpost] Error 2 > make: *** [Makefile:240: __sub-make] Error 2 Thanks for trying it out. Missed that. > You could add EXPORT_SYMBOL_*()'s on the above helpers or restrict > HALTPOLL_CPUIDLE module to built-in (remove "tristate" Kconfig). Yeah AFAICT this is the only cpuidle driver providing the module option. Unfortunately can't remove the tristate thing. People might already be using it as a module on x86. I think the arch_cpu_idle() makes sense to export. For arch_timer_evtstrm_available(), eventually the arch_haltpoll_*() in any case need to move out of a header file. I'll just do that now. > Otherwise, everything worked for me when built-in (=y) atop 6.10.0 > (4a4be1a). I see similar performance gains in `perf bench` on AWS > Graviton3 c7g.16xlarge. Excellent. Thanks for checking. -- ankur _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel