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* [PATCH v5 0/3] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state
@ 2019-05-21 17:21 Julien Grall
  2019-05-21 17:21 ` [PATCH v5 1/3] arm64/fpsimd: Remove the prototype for sve_flush_cpu_state() Julien Grall
                   ` (2 more replies)
  0 siblings, 3 replies; 9+ messages in thread
From: Julien Grall @ 2019-05-21 17:21 UTC (permalink / raw)
  To: linux-kernel, linux-arm-kernel, kvmarm
  Cc: ard.biesheuvel, marc.zyngier, catalin.marinas, will.deacon,
	Julien Grall, Dave.Martin

Hi all,

This patch series keeps softirqs enabled while touching FPSIMD/SVE state.
For more details on the impact see patch #3.

This patch series has been benchmarked on Linux 5.1-rc4 with defconfig.

On Juno2:
    * hackbench 100 process 1000 (10 times)
    * .7% quicker

On ThunderX 2:
    * hackbench 1000 process 1000 (20 times)
    * 3.4% quicker

Note that while the benchmark has been done on 5.1-rc4, the patch series is
based on 5.2-rc1.

Cheers,

Julien Grall (3):
  arm64/fpsimd: Remove the prototype for sve_flush_cpu_state()
  arch/arm64: fpsimd: Introduce fpsimd_save_and_flush_cpu_state() and
    use it
  arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state

 arch/arm64/include/asm/fpsimd.h |   5 +-
 arch/arm64/include/asm/simd.h   |  10 +--
 arch/arm64/kernel/fpsimd.c      | 139 +++++++++++++++++++++++++++-------------
 arch/arm64/kvm/fpsimd.c         |   4 +-
 4 files changed, 103 insertions(+), 55 deletions(-)

-- 
2.11.0

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^ permalink raw reply	[flat|nested] 9+ messages in thread

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Thread overview: 9+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2019-05-21 17:21 [PATCH v5 0/3] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state Julien Grall
2019-05-21 17:21 ` [PATCH v5 1/3] arm64/fpsimd: Remove the prototype for sve_flush_cpu_state() Julien Grall
2019-05-21 17:21 ` [PATCH v5 2/3] arch/arm64: fpsimd: Introduce fpsimd_save_and_flush_cpu_state() and use it Julien Grall
2019-06-04 11:12   ` Catalin Marinas
2019-06-04 11:52     ` Marc Zyngier
2019-05-21 17:21 ` [PATCH v5 3/3] arm64/fpsimd: Don't disable softirq when touching FPSIMD/SVE state Julien Grall
2019-06-03 16:25   ` Catalin Marinas
2019-06-03 21:21     ` Catalin Marinas
2019-06-04 10:35       ` Julien Grall

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