[RFT PATCH 2/7] perf stat: Save unnecessary print_metric() call

[Jonathan Cameron]

On Mon, 26 Jan 2026 20:35:09 +0800
Yushan Wang <wangyushan12 at huawei.com> wrote:

> Patch [1] removed the second branch of iostat_run, and changed num to 0
> since it is the default behavior. But during iostat_run, default value 1
> of num is required to avoid print_metric() call later.
> 
> Set num as 1 to avoid redundant print_metric() call that causes
> unaligned blank printed.
> 
> Fixes: b71f46a6a708 ("perf stat: Remove hard coded shadow metrics")
> 
> [1]: https://lore.kernel.org/all/20251111212206.631711-8-irogers@google.com/

Use a Link tag for links, but don't add them when they just point to the patch
you already have as a fixes tag.  Just refer to it as "The patch listed under
Fixes".
> 
> Signed-off-by: Yushan Wang <wangyushan12 at huawei.com>
> ---
>  tools/perf/util/stat-shadow.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/tools/perf/util/stat-shadow.c b/tools/perf/util/stat-shadow.c
> index 9c83f7d96caa..9439baf8002f 100644
> --- a/tools/perf/util/stat-shadow.c
> +++ b/tools/perf/util/stat-shadow.c
> @@ -319,8 +319,10 @@ void perf_stat__print_shadow_stats(struct perf_stat_config *config,
>  	void *ctxp = out->ctx;
>  	int num = 0;
>  
> -	if (config->iostat_run)
> +	if (config->iostat_run) {
>  		iostat_print_metric(config, evsel, out);
> +		num = 1;
> +	}
>  
>  	perf_stat__print_shadow_stats_metricgroup(config, evsel, aggr_idx,
>  						  &num, NULL, out);