linux-kernel - Re: [PATCH v7 4/8] lib/string_kunit: add performance benchmark for strlen()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <202601300935.1473FDF851@keescook>
Date: Fri, 30 Jan 2026 09:35:42 -0800
From: Kees Cook <kees@...nel.org>
To: Feng Jiang <jiangfeng@...inos.cn>
Cc: palmer@...belt.com, aou@...s.berkeley.edu, alex@...ti.fr,
	akpm@...ux-foundation.org, andy@...nel.org, ebiggers@...nel.org,
	martin.petersen@...cle.com, herbert@...dor.apana.org.au,
	samuel.holland@...ive.com, ajones@...tanamicro.com,
	conor.dooley@...rochip.com, charlie@...osinc.com, nathan@...nel.org,
	linusw@...nel.org, linux-riscv@...ts.infradead.org,
	linux-kernel@...r.kernel.org, linux-hardening@...r.kernel.org
Subject: Re: [PATCH v7 4/8] lib/string_kunit: add performance benchmark for
 strlen()

On Fri, Jan 30, 2026 at 10:50:14AM +0800, Feng Jiang wrote:
> Introduce a benchmarking framework to the string_kunit test suite to
> measure the execution efficiency of string functions.
> 
> The implementation is inspired by crc_benchmark(), measuring throughput
> (MB/s) and latency (ns/call) across a range of string lengths. It
> includes a warm-up phase, disables preemption during measurement, and
> uses a fixed seed for reproducible results.
> 
> This framework allows for comparing different implementations (e.g.,
> generic C vs. architecture-optimized assembly) within the KUnit
> environment.
> 
> Initially, provide a benchmark for strlen().
> 
> Suggested-by: Andy Shevchenko <andy@...nel.org>
> Suggested-by: Eric Biggers <ebiggers@...nel.org>
> Signed-off-by: Feng Jiang <jiangfeng@...inos.cn>

Reviewed-by: Kees Cook <kees@...nel.org>

-- 
Kees Cook