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From: Charlie Jenkins <charlie@rivosinc.com>
Subject: [PATCH 0/3] riscv: mm: Use hint address in mmap if available
Date: Mon, 29 Jan 2024 16:36:59 -0800
Message-Id: <20240129-use_mmap_hint_address-v1-0-4c74da813ba1@rivosinc.com>
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To: Alexandre Ghiti <alexghiti@rivosinc.com>, 
 Paul Walmsley <paul.walmsley@sifive.com>, 
 Palmer Dabbelt <palmer@dabbelt.com>, Albert Ou <aou@eecs.berkeley.edu>, 
 Shuah Khan <shuah@kernel.org>, Jonathan Corbet <corbet@lwn.net>, 
 Yangyu Chen <cyy@cyyself.name>
Cc: linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org, 
 linux-kselftest@vger.kernel.org, linux-doc@vger.kernel.org, 
 Charlie Jenkins <charlie@rivosinc.com>

On riscv, mmap currently returns an address from the largest address
space that can fit entirely inside of the hint address. This makes it
such that the hint address is almost never returned. This patch raises
the mappable area up to and including the hint address. This allows mmap
to often return the hint address, which allows a performance improvement
over searching for a valid address as well as making the behavior more
similar to other architectures.

Signed-off-by: Charlie Jenkins <charlie@rivosinc.com>
---
Charlie Jenkins (3):
      riscv: mm: Use hint address in mmap if available
      selftests: riscv: Generalize mm selftests
      docs: riscv: Define behavior of mmap

 Documentation/arch/riscv/vm-layout.rst           | 16 ++--
 arch/riscv/include/asm/processor.h               | 21 ++----
 tools/testing/selftests/riscv/mm/mmap_bottomup.c | 20 +----
 tools/testing/selftests/riscv/mm/mmap_default.c  | 20 +----
 tools/testing/selftests/riscv/mm/mmap_test.h     | 93 +++++++++++++-----------
 5 files changed, 66 insertions(+), 104 deletions(-)
---
base-commit: 556e2d17cae620d549c5474b1ece053430cd50bc
change-id: 20240119-use_mmap_hint_address-f9f4b1b6f5f1
-- 
- Charlie