From: Mihai Carabas <mihai.carabas@oracle.com> To: linux-arm-kernel@lists.infradead.org Cc: kvm@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, wanpengli@tencent.com, vkuznets@redhat.com, rafael@kernel.org, daniel.lezcano@linaro.org, akpm@linux-foundation.org, pmladek@suse.com, peterz@infradead.org, dianders@chromium.org, npiggin@gmail.com, rick.p.edgecombe@intel.com, joao.m.martins@oracle.com, juerg.haefliger@canonical.com, mic@digikod.net, mihai.carabas@oracle.com, arnd@arndb.de, ankur.a.arora@oracle.com Subject: [PATCH v2] Enable haltpoll for arm64 Date: Mon, 20 Nov 2023 16:01:31 +0200 [thread overview] Message-ID: <1700488898-12431-1-git-send-email-mihai.carabas@oracle.com> (raw) This patchset enables the usage of haltpoll governer on arm64. This is specifically interesting for KVM guests by reducing the IPC latencies. Here are some benchmarks without/with haltpoll for a KVM guest: a) without haltpoll: perf bench sched pipe # Running 'sched/pipe' benchmark: # Executed 1000000 pipe operations between two processes Total time: 8.138 [sec] 8.138094 usecs/op 122878 ops/sec b) with haltpoll: perf bench sched pipe # Running 'sched/pipe' benchmark: # Executed 1000000 pipe operations between two processes Total time: 5.003 [sec] 5.003085 usecs/op 199876 ops/sec v2 changes from v1: - added patch 7 where we change cpu_relax with smp_cond_load_relaxed per PeterZ (this improves by 50% at least the CPU cycles consumed in the tests above: 10,716,881,137 now vs 14,503,014,257 before) - removed the ifdef from patch 1 per RafaelW Joao Martins (6): x86: Move ARCH_HAS_CPU_RELAX to arch x86/kvm: Move haltpoll_want() to be arch defined governors/haltpoll: Drop kvm_para_available() check arm64: Select ARCH_HAS_CPU_RELAX arm64: Define TIF_POLLING_NRFLAG cpuidle-haltpoll: ARM64 support Mihai Carabas (1): cpuidle/poll_state: replace cpu_relax with smp_cond_load_relaxed arch/Kconfig | 3 +++ arch/arm64/Kconfig | 1 + arch/arm64/include/asm/thread_info.h | 6 ++++++ arch/x86/Kconfig | 1 + arch/x86/include/asm/cpuidle_haltpoll.h | 1 + arch/x86/kernel/kvm.c | 10 ++++++++++ drivers/cpuidle/Kconfig | 4 ++-- drivers/cpuidle/cpuidle-haltpoll.c | 8 ++------ drivers/cpuidle/governors/haltpoll.c | 5 +---- drivers/cpuidle/poll_state.c | 14 +++++++++----- include/linux/cpuidle_haltpoll.h | 5 +++++ 11 files changed, 41 insertions(+), 17 deletions(-) -- 1.8.3.1
WARNING: multiple messages have this Message-ID (diff)
From: Mihai Carabas <mihai.carabas@oracle.com> To: linux-arm-kernel@lists.infradead.org Cc: kvm@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, catalin.marinas@arm.com, will@kernel.org, tglx@linutronix.de, mingo@redhat.com, bp@alien8.de, x86@kernel.org, hpa@zytor.com, pbonzini@redhat.com, wanpengli@tencent.com, vkuznets@redhat.com, rafael@kernel.org, daniel.lezcano@linaro.org, akpm@linux-foundation.org, pmladek@suse.com, peterz@infradead.org, dianders@chromium.org, npiggin@gmail.com, rick.p.edgecombe@intel.com, joao.m.martins@oracle.com, juerg.haefliger@canonical.com, mic@digikod.net, mihai.carabas@oracle.com, arnd@arndb.de, ankur.a.arora@oracle.com Subject: [PATCH v2] Enable haltpoll for arm64 Date: Mon, 20 Nov 2023 16:01:31 +0200 [thread overview] Message-ID: <1700488898-12431-1-git-send-email-mihai.carabas@oracle.com> (raw) This patchset enables the usage of haltpoll governer on arm64. This is specifically interesting for KVM guests by reducing the IPC latencies. Here are some benchmarks without/with haltpoll for a KVM guest: a) without haltpoll: perf bench sched pipe # Running 'sched/pipe' benchmark: # Executed 1000000 pipe operations between two processes Total time: 8.138 [sec] 8.138094 usecs/op 122878 ops/sec b) with haltpoll: perf bench sched pipe # Running 'sched/pipe' benchmark: # Executed 1000000 pipe operations between two processes Total time: 5.003 [sec] 5.003085 usecs/op 199876 ops/sec v2 changes from v1: - added patch 7 where we change cpu_relax with smp_cond_load_relaxed per PeterZ (this improves by 50% at least the CPU cycles consumed in the tests above: 10,716,881,137 now vs 14,503,014,257 before) - removed the ifdef from patch 1 per RafaelW Joao Martins (6): x86: Move ARCH_HAS_CPU_RELAX to arch x86/kvm: Move haltpoll_want() to be arch defined governors/haltpoll: Drop kvm_para_available() check arm64: Select ARCH_HAS_CPU_RELAX arm64: Define TIF_POLLING_NRFLAG cpuidle-haltpoll: ARM64 support Mihai Carabas (1): cpuidle/poll_state: replace cpu_relax with smp_cond_load_relaxed arch/Kconfig | 3 +++ arch/arm64/Kconfig | 1 + arch/arm64/include/asm/thread_info.h | 6 ++++++ arch/x86/Kconfig | 1 + arch/x86/include/asm/cpuidle_haltpoll.h | 1 + arch/x86/kernel/kvm.c | 10 ++++++++++ drivers/cpuidle/Kconfig | 4 ++-- drivers/cpuidle/cpuidle-haltpoll.c | 8 ++------ drivers/cpuidle/governors/haltpoll.c | 5 +---- drivers/cpuidle/poll_state.c | 14 +++++++++----- include/linux/cpuidle_haltpoll.h | 5 +++++ 11 files changed, 41 insertions(+), 17 deletions(-) -- 1.8.3.1 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2023-11-20 15:16 UTC|newest] Thread overview: 46+ messages / expand[flat|nested] mbox.gz Atom feed top 2023-11-20 14:01 Mihai Carabas [this message] 2023-11-20 14:01 ` [PATCH v2] Enable haltpoll for arm64 Mihai Carabas 2023-11-20 14:01 ` [PATCH 1/7] x86: Move ARCH_HAS_CPU_RELAX to arch Mihai Carabas 2023-11-20 14:01 ` Mihai Carabas 2023-11-27 14:44 ` Petr Mladek 2023-11-27 14:44 ` Petr Mladek 2023-11-28 14:09 ` Mihai Carabas 2023-11-28 14:09 ` Mihai Carabas 2023-11-20 14:01 ` [PATCH 2/7] x86/kvm: Move haltpoll_want() to be arch defined Mihai Carabas 2023-11-20 14:01 ` Mihai Carabas 2023-11-29 20:55 ` Rafael J. Wysocki 2023-11-29 20:55 ` Rafael J. Wysocki 2023-11-20 14:01 ` [PATCH 3/7] governors/haltpoll: Drop kvm_para_available() check Mihai Carabas 2023-11-20 14:01 ` Mihai Carabas 2023-11-20 14:01 ` [PATCH 4/7] arm64: Select ARCH_HAS_CPU_RELAX Mihai Carabas 2023-11-20 14:01 ` Mihai Carabas 2023-11-20 14:01 ` [PATCH 5/7] arm64: Define TIF_POLLING_NRFLAG Mihai Carabas 2023-11-20 14:01 ` Mihai Carabas 2023-11-20 14:01 ` [PATCH 6/7] cpuidle-haltpoll: ARM64 support Mihai Carabas 2023-11-20 14:01 ` Mihai Carabas 2023-11-20 14:01 ` [PATCH 7/7] cpuidle/poll_state: replace cpu_relax with smp_cond_load_relaxed Mihai Carabas 2023-11-20 14:01 ` Mihai Carabas 2023-11-22 20:51 ` Christoph Lameter 2023-11-22 20:51 ` Christoph Lameter 2023-11-22 21:33 ` Mihai Carabas 2023-11-22 21:33 ` Mihai Carabas 2023-11-27 20:17 ` Christoph Lameter (Ampere) 2023-11-27 20:17 ` Christoph Lameter (Ampere) 2023-12-01 6:59 ` Ankur Arora 2023-12-01 6:59 ` Ankur Arora 2023-12-11 11:46 ` Will Deacon 2023-12-11 11:46 ` Will Deacon 2024-01-28 21:22 ` Mihai Carabas 2024-01-28 21:22 ` Mihai Carabas 2024-01-29 18:15 ` Will Deacon 2024-01-29 18:15 ` Will Deacon 2024-02-05 12:28 ` Mihai Carabas 2024-02-05 12:28 ` Mihai Carabas 2024-02-05 19:33 ` Ankur Arora 2024-02-05 19:33 ` Ankur Arora 2024-01-17 21:19 ` [PATCH v2] Enable haltpoll for arm64 Christoph Lameter (Ampere) 2024-01-17 21:19 ` Christoph Lameter (Ampere) 2024-01-25 14:39 ` Mihai Carabas 2024-01-25 14:39 ` Mihai Carabas 2024-01-25 15:16 ` Rafael J. Wysocki 2024-01-25 15:16 ` Rafael J. Wysocki
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