Messages in this thread |  | | From | Zhenyu Ye <> | Subject | [PATCH v1 0/2] arm64: tlb: add support for TLBI RANGE instructions | Date | Thu, 9 Jul 2020 17:10:52 +0800 |
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NOTICE: this series are based on the arm64 for-next/tlbi branch: git://git.kernel.org/pub/scm/linux/kernel/git/arm64/linux.git for-next/tlbi
-- ARMv8.4-TLBI provides TLBI invalidation instruction that apply to a range of input addresses. This series add support for this feature.
I tested this feature on a FPGA machine whose cpus support the tlbi range. As the page num increases, the performance is improved significantly. When page num = 256, the performance is improved by about 10 times.
Below is the test data when the stride = PTE:
[page num] [classic] [tlbi range] 1 16051 13524 2 11366 11146 3 11582 12171 4 11694 11101 5 12138 12267 6 12290 11105 7 12400 12002 8 12837 11097 9 14791 12140 10 15461 11087 16 18233 11094 32 26983 11079 64 43840 11092 128 77754 11098 256 145514 11089 512 280932 11111
See more details in:
https://lore.kernel.org/linux-arm-kernel/504c7588-97e5-e014-fca0-c5511ae0d256@huawei.com/
-- RFC patches: - Link: https://lore.kernel.org/linux-arm-kernel/20200708124031.1414-1-yezhenyu2@huawei.com/
Zhenyu Ye (2): arm64: tlb: Detect the ARMv8.4 TLBI RANGE feature arm64: tlb: Use the TLBI RANGE feature in arm64
arch/arm64/include/asm/cpucaps.h | 3 +- arch/arm64/include/asm/sysreg.h | 3 + arch/arm64/include/asm/tlbflush.h | 156 ++++++++++++++++++++++++------ arch/arm64/kernel/cpufeature.c | 10 ++ 4 files changed, 141 insertions(+), 31 deletions(-)
-- 2.19.1
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