Re: [PATCH v7 0/7] arm_pmu: Use NMI for perf interrupt
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From: Will Deacon <will@kernel.org>
Date: 2020-09-28 23:30:33
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On Thu, 24 Sep 2020 12:06:59 +0100, Alexandru Elisei wrote:
The series changes the arm_pmu driver to use NMIs for the perf interrupt when NMIs are available on the platform (currently, only arm64 + GICv3). To make it easier to play with the patches, I've pushed a branch at [1]: $ git clone -b pmu-nmi-v7 git://linux-arm.org/linux-ae The changes from v6 were minor, but I've still run the same tests on an espressobin v7*. These are the results of running perf record -a -- sleep 60 (all results show kernel symbols with overhead >= 1%): [...]
Applied to will (for-next/perf), thanks!
[1/7] arm64: perf: Add missing ISB in armv8pmu_enable_counter()
https://git.kernel.org/will/c/490d7b7c0845
[2/7] arm64: perf: Avoid PMXEV* indirection
https://git.kernel.org/will/c/0fdf1bb75953
[3/7] arm64: perf: Remove PMU locking
https://git.kernel.org/will/c/2a0e2a02e4b7
[4/7] arm64: perf: Defer irq_work to IPI_IRQ_WORK
https://git.kernel.org/will/c/05ab72813340
[5/7] KVM: arm64: pmu: Make overflow handler NMI safe
https://git.kernel.org/will/c/95e92e45a454
[6/7] arm_pmu: Introduce pmu_irq_ops
https://git.kernel.org/will/c/f76b130bdb89
[7/7] arm_pmu: arm64: Use NMIs for PMU
https://git.kernel.org/will/c/d8f6267f7ce5
Cheers,
--
Will
https://fixes.arm64.dev
https://next.arm64.dev
https://will.arm64.dev
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