From: David Laight <david.laight.linux@gmail.com>
To: Feng Jiang <jiangfeng@kylinos.cn>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
Andy Shevchenko <andriy.shevchenko@intel.com>,
pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
alex@ghiti.fr, akpm@linux-foundation.org, kees@kernel.org,
andy@kernel.org, ebiggers@kernel.org, martin.petersen@oracle.com,
ardb@kernel.org, charlie@rivosinc.com,
conor.dooley@microchip.com, ajones@ventanamicro.com,
linus.walleij@linaro.org, nathan@kernel.org,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH v3 0/8] riscv: optimize string functions and add kunit tests
Date: Fri, 23 Jan 2026 10:16:02 +0000 [thread overview]
Message-ID: <20260123101602.111c6210@pumpkin> (raw)
In-Reply-To: <26d08954-2826-4c48-a540-6e0857faf5ec@kylinos.cn>
On Fri, 23 Jan 2026 11:12:00 +0800
Feng Jiang <jiangfeng@kylinos.cn> wrote:
>...
> I am still exploring some of the finer points of these low-level performance
> trade-offs, so your input is very helpful. I will definitely spend some time
> studying this further and experiment with the approaches you mentioned.
You can spend a long time micro-optimising small functions.
I know, I've done it....
Then you need to test on as many cpu variants as you can find.
David
WARNING: multiple messages have this Message-ID (diff)
From: David Laight <david.laight.linux@gmail.com>
To: Feng Jiang <jiangfeng@kylinos.cn>
Cc: Andy Shevchenko <andy.shevchenko@gmail.com>,
Andy Shevchenko <andriy.shevchenko@intel.com>,
pjw@kernel.org, palmer@dabbelt.com, aou@eecs.berkeley.edu,
alex@ghiti.fr, akpm@linux-foundation.org, kees@kernel.org,
andy@kernel.org, ebiggers@kernel.org, martin.petersen@oracle.com,
ardb@kernel.org, charlie@rivosinc.com,
conor.dooley@microchip.com, ajones@ventanamicro.com,
linus.walleij@linaro.org, nathan@kernel.org,
linux-riscv@lists.infradead.org, linux-kernel@vger.kernel.org,
linux-hardening@vger.kernel.org
Subject: Re: [PATCH v3 0/8] riscv: optimize string functions and add kunit tests
Date: Fri, 23 Jan 2026 10:16:02 +0000 [thread overview]
Message-ID: <20260123101602.111c6210@pumpkin> (raw)
In-Reply-To: <26d08954-2826-4c48-a540-6e0857faf5ec@kylinos.cn>
On Fri, 23 Jan 2026 11:12:00 +0800
Feng Jiang <jiangfeng@kylinos.cn> wrote:
>...
> I am still exploring some of the finer points of these low-level performance
> trade-offs, so your input is very helpful. I will definitely spend some time
> studying this further and experiment with the approaches you mentioned.
You can spend a long time micro-optimising small functions.
I know, I've done it....
Then you need to test on as many cpu variants as you can find.
David
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linux-riscv mailing list
linux-riscv@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-riscv
next prev parent reply other threads:[~2026-01-23 10:16 UTC|newest]
Thread overview: 58+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-01-20 6:58 [PATCH v3 0/8] riscv: optimize string functions and add kunit tests Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 6:58 ` [PATCH v3 1/8] lib/string_kunit: add correctness test for strlen Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:28 ` Andy Shevchenko
2026-01-20 7:28 ` Andy Shevchenko
2026-01-20 6:58 ` [PATCH v3 2/8] lib/string_kunit: add correctness test for strnlen Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:29 ` Andy Shevchenko
2026-01-20 7:29 ` Andy Shevchenko
2026-01-20 6:58 ` [PATCH v3 3/8] lib/string_kunit: add correctness test for strrchr() Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:30 ` Andy Shevchenko
2026-01-20 7:30 ` Andy Shevchenko
2026-01-20 6:58 ` [PATCH v3 4/8] lib/string_kunit: add performance benchmarks for strlen Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:46 ` Andy Shevchenko
2026-01-20 7:46 ` Andy Shevchenko
2026-01-21 5:45 ` Feng Jiang
2026-01-21 5:45 ` Feng Jiang
2026-01-20 6:58 ` [PATCH v3 5/8] lib/string_kunit: extend benchmarks to strnlen and chr searches Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:48 ` Andy Shevchenko
2026-01-20 7:48 ` Andy Shevchenko
2026-01-21 5:48 ` Feng Jiang
2026-01-21 5:48 ` Feng Jiang
2026-01-20 6:58 ` [PATCH v3 6/8] riscv: lib: add strnlen implementation Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:31 ` Andy Shevchenko
2026-01-20 7:31 ` Andy Shevchenko
2026-01-21 5:52 ` Feng Jiang
2026-01-21 5:52 ` Feng Jiang
2026-01-21 7:24 ` Qingfang Deng
2026-01-21 7:24 ` Qingfang Deng
2026-01-23 1:28 ` Feng Jiang
2026-01-23 1:28 ` Feng Jiang
2026-01-20 6:58 ` [PATCH v3 7/8] riscv: lib: add strchr implementation Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:31 ` Andy Shevchenko
2026-01-20 7:31 ` Andy Shevchenko
2026-01-20 6:58 ` [PATCH v3 8/8] riscv: lib: add strrchr implementation Feng Jiang
2026-01-20 6:58 ` Feng Jiang
2026-01-20 7:32 ` Andy Shevchenko
2026-01-20 7:32 ` Andy Shevchenko
2026-01-20 7:36 ` [PATCH v3 0/8] riscv: optimize string functions and add kunit tests Andy Shevchenko
2026-01-20 7:36 ` Andy Shevchenko
2026-01-21 6:44 ` Feng Jiang
2026-01-21 6:44 ` Feng Jiang
2026-01-21 7:01 ` Andy Shevchenko
2026-01-21 7:01 ` Andy Shevchenko
2026-01-21 8:12 ` Feng Jiang
2026-01-21 8:12 ` Feng Jiang
2026-01-21 10:57 ` David Laight
2026-01-21 10:57 ` David Laight
2026-01-23 3:12 ` Feng Jiang
2026-01-23 3:12 ` Feng Jiang
2026-01-23 10:16 ` David Laight [this message]
2026-01-23 10:16 ` David Laight
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