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authorJisheng Zhang <jszhang@kernel.org>2023-12-19 20:50:46 +0300
committerPalmer Dabbelt <palmer@rivosinc.com>2024-01-25 02:55:56 +0300
commit3f910b7a522e064d7261f31a00d9c9dca31d902a (patch)
tree73bdd6bb36be0ca2a5dfb61e5f04fadec1833566 /arch/riscv/Kconfig
parent69be3fb111e73bd025ce6d2322371da5aa497c70 (diff)
downloadlinux-3f910b7a522e064d7261f31a00d9c9dca31d902a.tar.xz
riscv: enable HAVE_FAST_GUP if MMU
Activate the fast gup for riscv mmu platforms. Here are some GUP_FAST_BENCHMARK performance numbers: Before the patch: GUP_FAST_BENCHMARK: Time: get:53203 put:5085 us After the patch: GUP_FAST_BENCHMARK: Time: get:17711 put:5060 us The get time is reduced by 66.7%! IOW, 3x get speed! Signed-off-by: Jisheng Zhang <jszhang@kernel.org> Reviewed-by: Alexandre Ghiti <alexghiti@rivosinc.com> Link: https://lore.kernel.org/r/20231219175046.2496-5-jszhang@kernel.org Signed-off-by: Palmer Dabbelt <palmer@rivosinc.com>
Diffstat (limited to 'arch/riscv/Kconfig')
-rw-r--r--arch/riscv/Kconfig1
1 files changed, 1 insertions, 0 deletions
diff --git a/arch/riscv/Kconfig b/arch/riscv/Kconfig
index a0d9b8f5371d..9e1e7c74b1f9 100644
--- a/arch/riscv/Kconfig
+++ b/arch/riscv/Kconfig
@@ -119,6 +119,7 @@ config RISCV
select HAVE_FUNCTION_GRAPH_RETVAL if HAVE_FUNCTION_GRAPH_TRACER
select HAVE_FUNCTION_TRACER if !XIP_KERNEL && !PREEMPTION
select HAVE_EBPF_JIT if MMU
+ select HAVE_FAST_GUP if MMU
select HAVE_FUNCTION_ARG_ACCESS_API
select HAVE_FUNCTION_ERROR_INJECTION
select HAVE_GCC_PLUGINS