[PATCH v3 RESEND 0/2] riscv: enable lockless lockref implementation

From: Jisheng Zhang <jszhang@kernel.org>
To: Paul Walmsley <paul.walmsley@sifive.com>,
	Palmer Dabbelt <palmer@dabbelt.com>,
	Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org
Subject: [PATCH v3 RESEND 0/2] riscv: enable lockless lockref implementation
Date: Mon, 25 Mar 2024 19:10:36 +0800	[thread overview]
Message-ID: <20240325111038.1700-1-jszhang@kernel.org> (raw)

This series selects ARCH_USE_CMPXCHG_LOCKREF to enable the
cmpxchg-based lockless lockref implementation for riscv. Then,
implement arch_cmpxchg64_{relaxed|acquire|release}.

After patch1:
Using Linus' test case[1] on TH1520 platform, I see a 11.2% improvement.
On JH7110 platform, I see 12.0% improvement.

After patch2:
on both TH1520 and JH7110 platforms, I didn't see obvious
performance improvement with Linus' test case [1]. IMHO, this may
be related with the fence and lr.d/sc.d hw implementations. In theory,
lr/sc without fence could give performance improvement over lr/sc plus
fence, so add the code here to leave performance improvement room on
newer HW platforms.

Link: http://marc.info/?l=linux-fsdevel&m=137782380714721&w=4 [1]

Since v2:
  - rebase on v6.8-rc1
  - collect Reviewed-by tag

Since v1:
  - only select ARCH_USE_CMPXCHG_LOCKREF if 64BIT

Jisheng Zhang (2):
  riscv: select ARCH_USE_CMPXCHG_LOCKREF
  riscv: cmpxchg: implement arch_cmpxchg64_{relaxed|acquire|release}

 arch/riscv/Kconfig               |  1 +
 arch/riscv/include/asm/cmpxchg.h | 18 ++++++++++++++++++
 2 files changed, 19 insertions(+)

-- 
2.43.0

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