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EX19MTAUWC002.ant.amazon.com [10.0.7.35:13629] by smtpin.naws.us-west-2.prod.farcaster.email.amazon.dev [10.0.22.28:2525] with esmtp (Farcaster) id e9f696c0-703f-49e5-9889-2e0bf8db9fb1; Thu, 30 May 2024 23:07:18 +0000 (UTC) X-Farcaster-Flow-ID: e9f696c0-703f-49e5-9889-2e0bf8db9fb1 Received: from EX19D001UWA002.ant.amazon.com (10.13.138.236) by EX19MTAUWC002.ant.amazon.com (10.250.64.143) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1258.28; Thu, 30 May 2024 23:07:18 +0000 Received: from EX19D001UWA003.ant.amazon.com (10.13.138.211) by EX19D001UWA002.ant.amazon.com (10.13.138.236) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_128_CBC_SHA) id 15.2.1258.28; Thu, 30 May 2024 23:07:18 +0000 Received: from EX19D001UWA003.ant.amazon.com ([fe80::256a:26de:3ee6:48a2]) by EX19D001UWA003.ant.amazon.com ([fe80::256a:26de:3ee6:48a2%7]) with mapi id 15.02.1258.028; Thu, 30 May 2024 23:07:18 +0000 From: "Okanovic, Haris" To: "linux-arm-kernel@lists.infradead.org" , "kvm@vger.kernel.org" , "linux-pm@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "ankur.a.arora@oracle.com" CC: "joao.m.martins@oracle.com" , "boris.ostrovsky@oracle.com" , "konrad.wilk@oracle.com" , "wanpengli@tencent.com" , "mingo@redhat.com" , "catalin.marinas@arm.com" , "pbonzini@redhat.com" , "tglx@linutronix.de" , "daniel.lezcano@linaro.org" , "lenb@kernel.org" , "arnd@arndb.de" , "will@kernel.org" , "hpa@zytor.com" , "peterz@infradead.org" , "vkuznets@redhat.com" , "bp@alien8.de" , "Okanovic, Haris" , "rafael@kernel.org" , "x86@kernel.org" , "mark.rutland@arm.com" Thread-Index: AQHamy2ih2zHEXQ7TU2Y0lcrXsZX2LGwld+A Date: Thu, 30 May 2024 23:07:18 +0000 Message-ID: <41a184a3f5695061487e86a6da5eb87c140dbe3c.camel@amazon.com> References: <20240430183730.561960-1-ankur.a.arora@oracle.com> <20240430183730.561960-9-ankur.a.arora@oracle.com> In-Reply-To: <20240430183730.561960-9-ankur.a.arora@oracle.com> Accept-Language: en-US Content-Language: en-US X-MS-Has-Attach: X-MS-TNEF-Correlator: x-originating-ip: [10.106.179.6] Content-ID: MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20240530_160723_900116_D561801D X-CRM114-Status: GOOD ( 27.20 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; 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 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 You could add EXPORT_SYMBOL_*()'s on the above helpers or restrict HALTPOLL_CPUIDLE module to built-in (remove "tristate" Kconfig). 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. Regards, Haris Okanovic > +} > +#endif > -- > 2.39.3 > _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel