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

[Kees Cook]

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 at kernel.org>
> Suggested-by: Eric Biggers <ebiggers at kernel.org>
> Signed-off-by: Feng Jiang <jiangfeng at kylinos.cn>

Reviewed-by: Kees Cook <kees at kernel.org>

-- 
Kees Cook