Unverified Commit eb1e5037 authored by Jisheng Zhang's avatar Jisheng Zhang Committed by Palmer Dabbelt
Browse files

riscv: select ARCH_USE_CMPXCHG_LOCKREF 

Select ARCH_USE_CMPXCHG_LOCKREF to enable the cmpxchg-based lockless
lockref implementation for riscv.

Using Linus' test case[1] on TH1520 platform, I see a 11.2% improvement.
On JH7110 platform, I see 12.0% improvement.

Link: http://marc.info/?l=linux-fsdevel&m=137782380714721&w=4

 [1]
Signed-off-by: default avatarJisheng Zhang <jszhang@kernel.org>
Reviewed-by: default avatarAndrea Parri <parri.andrea@gmail.com>
Link: https://lore.kernel.org/r/20240325111038.1700-2-jszhang@kernel.org


Signed-off-by: default avatarPalmer Dabbelt <palmer@rivosinc.com>
parent 6613476e

arch/riscv/Kconfig

+1 −0
Original line number Diff line number Diff line
@@ -50,6 +50,7 @@ config RISCV 
	select ARCH_SUPPORTS_PAGE_TABLE_CHECK if MMU

	select ARCH_SUPPORTS_PER_VMA_LOCK if MMU

	select ARCH_SUPPORTS_SHADOW_CALL_STACK if HAVE_SHADOW_CALL_STACK

	select ARCH_USE_CMPXCHG_LOCKREF if 64BIT

	select ARCH_USE_MEMTEST

	select ARCH_USE_QUEUED_RWLOCKS

	select ARCH_USES_CFI_TRAPS if CFI_CLANG