From: Will Deacon <will@kernel.org>
To: mark.rutland@arm.com, linux-arm-kernel@lists.infradead.org,
Yicong Yang <yangyicong@huawei.com>
Cc: catalin.marinas@arm.com, kernel-team@android.com,
Will Deacon <will@kernel.org>,
sudeep.holla@arm.com, james.clark@linaro.org, robh@kernel.org,
anshuman.khandual@arm.com, jonathan.cameron@huawei.com,
hejunhao3@huawei.com, linuxarm@huawei.com,
prime.zeng@hisilicon.com, xuwei5@huawei.com,
wangyushan12@huawei.com, yangyicong@hisilicon.com
Subject: Re: [PATCH v2 0/2] perf: arm_pmuv3: Don't use PMCCNTR_EL0 on SMT cores
Date: Thu, 18 Sep 2025 17:43:11 +0100 [thread overview]
Message-ID: <175820255676.3473406.16924296016129578924.b4-ty@kernel.org> (raw)
In-Reply-To: <20250820084534.28037-1-yangyicong@huawei.com>
On Wed, 20 Aug 2025 16:45:32 +0800, Yicong Yang wrote:
> This patchset fixed CPU_CYCLES counting on SMT system. CPU_CYCLES can use
> PMCCNTR_EL0 which will count the hardware processor clock rather than the
> PE clock (ARM DDI0487 L.b D13.1.3) on SMT cores which fails the users
> expectation as CPU_CYCLES (0x0011) is defined to count on each PE cycles.
> Fix this by avoid using PMCCNTR_EL0 on SMT cores when counting CPU_CYCLES.
>
> Changes since v1:
> - remove redundant comment and add tags on Patch 1/2
> - detect the SMT implementation during PMU probe rather than runtime
> Link: https://lore.kernel.org/linux-arm-kernel/20250812080830.20796-1-yangyicong@huawei.com/
>
> [...]
Applied first patch to will (for-next/perf), thanks!
[1/2] perf: arm_pmuv3: Factor out PMCCNTR_EL0 use conditions
https://git.kernel.org/will/c/f8f89e8cf3d6
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
prev parent reply other threads:[~2025-09-18 16:43 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-08-20 8:45 [PATCH v2 0/2] perf: arm_pmuv3: Don't use PMCCNTR_EL0 on SMT cores Yicong Yang
2025-08-20 8:45 ` [PATCH v2 1/2] perf: arm_pmuv3: Factor out PMCCNTR_EL0 use conditions Yicong Yang
2025-08-20 8:45 ` [PATCH v2 2/2] perf: arm_pmuv3: Don't use PMCCNTR_EL0 on SMT cores Yicong Yang
2025-09-18 13:32 ` Will Deacon
2025-09-19 8:56 ` Yicong Yang
2025-09-19 9:16 ` Mark Rutland
2025-09-19 10:27 ` Yicong Yang
2025-09-19 11:17 ` Will Deacon
2025-09-19 9:37 ` Sudeep Holla
2025-09-19 11:18 ` Will Deacon
2025-09-08 7:09 ` [PATCH v2 0/2] " Yicong Yang
2025-09-18 16:43 ` Will Deacon [this message]
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