Re: [PATCH v4] perf bench: Add atomic operations benchmark

[sashiko-bot@kernel.org]

> Add a new 'atomic' collection to perf bench for benchmarking
> atomic read-modify-write operations with multi-threaded
> contention testing. It provides two subcommands:
> 
>   - atomic cas: contended compare-and-swap operations
>     (__atomic_compare_exchange_n)
>   - atomic inc: contended fetch-add operations (__atomic_fetch_add)
> 
> Both support a configurable thread count and runtime to measure
> atomic contention effects.
> 
> Why this benchmark is needed:
> - Atomic read-modify-write operations are fundamental to lock-free
>   algorithms and data structures. Understanding their performance
>   characteristics under contention is critical for designing
> [ ... ]
> - Per-thread ops: fastest/slowest/avg operations per thread in the
>   last repeat (shows scheduling imbalance and lack of progress)
> 
> Assisted-by: opencode:DeepSeek-V4-Pro
> Signed-off-by: Changbin Du <changbin.du@gmail.com>

Sashiko has reviewed this patch and found no issues. It looks great!

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Sashiko AI review · https://sashiko.dev/#/patchset/20261013085648.976819-1-changbin.du@gmail.com?part=1