Re: [PATCH v1 07/22] perf expr: Add #target_cpu literal

[Namhyung Kim <namhyung@kernel.org>]

On Fri, Oct 24, 2025 at 10:58:42AM -0700, Ian Rogers wrote:
> For CPU nanoseconds a lot of the stat-shadow metrics use either
> task-clock or cpu-clock, the latter being used when
> target__has_cpu. Add a #target_cpu literal so that json metrics can
> perform the same test.

Do we have documentation for the literals and metric expressions in
general?  I think it's getting complex and we should provide one.

Thanks,
Namhyung

> 
> Signed-off-by: Ian Rogers <irogers@google.com>
> ---
>  tools/perf/util/expr.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/perf/util/expr.c b/tools/perf/util/expr.c
> index 7fda0ff89c16..4df56f2b283d 100644
> --- a/tools/perf/util/expr.c
> +++ b/tools/perf/util/expr.c
> @@ -409,6 +409,9 @@ double expr__get_literal(const char *literal, const struct expr_scanner_ctx *ctx
>  	} else if (!strcmp("#core_wide", literal)) {
>  		result = core_wide(ctx->system_wide, ctx->user_requested_cpu_list)
>  			? 1.0 : 0.0;
> +	} else if (!strcmp("#target_cpu", literal)) {
> +		result = (ctx->system_wide || ctx->user_requested_cpu_list)
> +			? 1.0 : 0.0;
>  	} else {
>  		pr_err("Unrecognized literal '%s'", literal);
>  	}
> -- 
> 2.51.1.821.gb6fe4d2222-goog
>