From: Mihai Carabas <mihai.carabas@oracle.com>
To: linux-arm-kernel@lists.infradead.org,
Peter Zijlstra <peterz@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, arnd@arndb.de, ankur.a.arora@oracle.com
Subject: Re: [PATCH v2] Enable haltpoll for arm64
Date: Thu, 25 Jan 2024 16:39:17 +0200 [thread overview]
Message-ID: <88356fdc-91f4-4f43-97a5-3da0ce455515@oracle.com> (raw)
In-Reply-To: <1700488898-12431-1-git-send-email-mihai.carabas@oracle.com>
Hello,
How can we move this patchset forward?
Thank you,
Mihai
La 20.11.2023 16:01, Mihai Carabas a scris:
> 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(-)
>
next prev parent reply other threads:[~2024-01-25 14:40 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
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
2023-11-27 14:44 ` Petr Mladek
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
2023-11-29 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 ` [PATCH 4/7] arm64: Select ARCH_HAS_CPU_RELAX Mihai Carabas
2023-11-20 14:01 ` [PATCH 5/7] arm64: Define TIF_POLLING_NRFLAG Mihai Carabas
2023-11-20 14:01 ` [PATCH 6/7] cpuidle-haltpoll: ARM64 support Mihai Carabas
2023-11-20 14:01 ` [PATCH 7/7] cpuidle/poll_state: replace cpu_relax with smp_cond_load_relaxed Mihai Carabas
2023-11-22 20:51 ` Christoph Lameter
2023-11-22 21:33 ` Mihai Carabas
2023-11-27 20:17 ` Christoph Lameter (Ampere)
2023-12-01 6:59 ` Ankur Arora
2023-12-11 11:46 ` Will Deacon
2024-01-28 21:22 ` Mihai Carabas
2024-01-29 18:15 ` Will Deacon
2024-02-05 12:28 ` Mihai Carabas
2024-02-05 19:33 ` Ankur Arora
2024-01-17 21:19 ` [PATCH v2] Enable haltpoll for arm64 Christoph Lameter (Ampere)
2024-01-25 14:39 ` Mihai Carabas [this message]
2024-01-25 15:16 ` Rafael J. Wysocki
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