Re: [PATCH v3] perf cpumap: Reduce cpu size from int to int16_t

[Namhyung Kim]

On Mon, 10 Feb 2025 11:12:31 -0800, Ian Rogers wrote:
> Fewer than 32k logical CPUs are currently supported by perf. A cpumap
> is indexed by an integer (see perf_cpu_map__cpu) yielding a perf_cpu
> that wraps a 4-byte int for the logical CPU - the wrapping is done
> deliberately to avoid confusing a logical CPU with an index into a
> cpumap. Using a 4-byte int within the perf_cpu is larger than required
> so this patch reduces it to the 2-byte int16_t. For a cpumap
> containing 16 entries this will reduce the array size from 64 to 32
> bytes. For very large servers with lots of logical CPUs the size
> savings will be greater.
> 
> [...]
Applied to perf-tools-next, thanks!

Best regards,
Namhyung