linux-kernel - [PATCH] Enable haltpoll for arm64

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Message-Id: <1691581193-8416-1-git-send-email-mihai.carabas@oracle.com>
Date:   Wed,  9 Aug 2023 14:39:34 +0300
From:   Mihai Carabas <mihai.carabas@...cle.com>
To:     unlisted-recipients:; (no To-header on input)
Cc:     Mihai Carabas <mihai.carabas@...cle.com>,
        Catalin Marinas <catalin.marinas@....com>,
        Will Deacon <will@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Daniel Lezcano <daniel.lezcano@...aro.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Kees Cook <keescook@...omium.org>,
        Peter Zijlstra <peterz@...radead.org>,
        Petr Mladek <pmladek@...e.com>,
        Ard Biesheuvel <ardb@...nel.org>,
        Sami Tolvanen <samitolvanen@...gle.com>,
        Nicholas Piggin <npiggin@...il.com>,
        Juerg Haefliger <juerg.haefliger@...onical.com>,
        Mickaël Salaün <mic@...ikod.net>,
        Joao Martins <joao.m.martins@...cle.com>,
        Arnd Bergmann <arnd@...db.de>,
        Ankur Arora <ankur.a.arora@...cle.com>,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        kvm@...r.kernel.org, linux-pm@...r.kernel.org
Subject: [PATCH] Enable haltpoll for arm64

This patchset enables the usage of haltpoll governer on arm64. This is
specifically interesting for KVM guests.

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: 8.410 [sec]

       8.410882 usecs/op
         118893 ops/sec

b) with haltpoll:
perf bench sched pipe
# Running 'sched/pipe' benchmark:
# Executed 1000000 pipe operations between two processes
     Total time: 5.183 [sec]
       5.183491 usecs/op
         192920 ops/sec

Joao Martins (7):
  cpuidle-haltpoll: Make boot_option_idle_override check X86 specific
  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

 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                   | 6 ++++++
 drivers/cpuidle/Kconfig                 | 4 ++--
 drivers/cpuidle/cpuidle-haltpoll.c      | 6 ++++--
 drivers/cpuidle/governors/haltpoll.c    | 5 +----
 include/linux/cpuidle_haltpoll.h        | 5 +++++
 10 files changed, 30 insertions(+), 8 deletions(-)

-- 
1.8.3.1