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| author | Jisheng Zhang <jszhang@kernel.org> | 2023-05-23 19:59:42 +0300 |
|---|---|---|
| committer | Palmer Dabbelt <palmer@rivosinc.com> | 2023-06-20 18:10:13 +0300 |
| commit | 648321fa0d970c04b4327ac1a053abf43d285931 (patch) | |
| tree | b3b71a1f090d3fc8fcce526dcd20ecad301ef894 /arch/riscv/Kconfig | |
| parent | 7d3332be011e4ed061c1403b30b5e54ebccb4fa2 (diff) | |
| download | linux-648321fa0d970c04b4327ac1a053abf43d285931.tar.xz | |
riscv: mm: try VMA lock-based page fault handling first
Attempt VMA lock-based page fault handling first, and fall back to the
existing mmap_lock-based handling if that fails.
A simple running the ebizzy benchmark on Lichee Pi 4A shows that
PER_VMA_LOCK can improve the ebizzy benchmark by about 32.68%. In
theory, the more CPUs, the bigger improvement, but I don't have any
HW platform which has more than 4 CPUs.
This is the riscv variant of "x86/mm: try VMA lock-based page fault
handling first".
Signed-off-by: Jisheng Zhang <jszhang@kernel.org>
Reviewed-by: Guo Ren <guoren@kernel.org>
Reviewed-by: Suren Baghdasaryan <surenb@google.com>
Link: https://lore.kernel.org/r/20230523165942.2630-1-jszhang@kernel.org
Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/Kconfig')
| -rw-r--r-- | arch/riscv/Kconfig | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig index a3d54cd14fca..a9e8b697fefb 100644 --- a/arch/riscv/Kconfig +++ b/arch/riscv/Kconfig @@ -44,6 +44,7 @@ config RISCV select ARCH_SUPPORTS_DEBUG_PAGEALLOC if MMU select ARCH_SUPPORTS_HUGETLBFS if MMU select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU + select ARCH_SUPPORTS_PER_VMA_LOCK if MMU select ARCH_USE_MEMTEST select ARCH_USE_QUEUED_RWLOCKS select ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT if MMU |