linux-kernel - Re: [PATCH RESEND v4 01/11] perf: Add print

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Message-ID: <aVhC40oJIx1cbfiJ@google.com>
Date: Fri, 2 Jan 2026 14:12:51 -0800
From: Namhyung Kim <namhyung@...nel.org>
To: Swapnil Sapkal <swapnil.sapkal@....com>
Cc: peterz@...radead.org, mingo@...hat.com, acme@...nel.org,
	irogers@...gle.com, james.clark@....com, ravi.bangoria@....com,
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	rostedt@...dmis.org, vincent.guittot@...aro.org,
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	santosh.shukla@....com, sandipan.das@....com
Subject: Re: [PATCH RESEND v4 01/11] perf: Add print_separator to util

Hello,

Sorry for the delay and happy new year!

On Tue, Sep 09, 2025 at 11:42:17AM +0000, Swapnil Sapkal wrote:
> Add print_separator to util.c and use it wherever necessary.
> 
> Signed-off-by: Swapnil Sapkal <swapnil.sapkal@....com>
> ---
>  tools/perf/builtin-kwork.c | 13 ++++---------
>  tools/perf/util/util.c     |  6 ++++++
>  tools/perf/util/util.h     |  2 ++
>  3 files changed, 12 insertions(+), 9 deletions(-)
> 
> diff --git a/tools/perf/builtin-kwork.c b/tools/perf/builtin-kwork.c
> index d2e08de5976d..842f59ff85ac 100644
> --- a/tools/perf/builtin-kwork.c
> +++ b/tools/perf/builtin-kwork.c
> @@ -1340,11 +1340,6 @@ static struct kwork_class *kwork_class_supported_list[KWORK_CLASS_MAX] = {
>  	[KWORK_CLASS_SCHED]     = &kwork_sched,
>  };
>  
> -static void print_separator(int len)
> -{
> -	printf(" %.*s\n", len, graph_dotted_line);
> -}
> -
>  static int report_print_work(struct perf_kwork *kwork, struct kwork_work *work)
>  {
>  	int ret = 0;
> @@ -1458,7 +1453,7 @@ static int report_print_header(struct perf_kwork *kwork)
>  	}
>  
>  	printf("\n");
> -	print_separator(ret);
> +	print_separator(ret, "", 0);
>  	return ret;
>  }
>  
> @@ -1633,7 +1628,7 @@ static void top_print_header(struct perf_kwork *kwork __maybe_unused)
>  		     PRINT_RUNTIME_HEADER_WIDTH + RPINT_DECIMAL_WIDTH, "RUNTIME",
>  		     PRINT_TASK_NAME_WIDTH, "COMMAND");
>  	printf("\n ");
> -	print_separator(ret);
> +	print_separator(ret, "", 0);
>  }
>  
>  static int top_print_work(struct perf_kwork *kwork __maybe_unused, struct kwork_work *work)
> @@ -1933,11 +1928,11 @@ static int perf_kwork__report(struct perf_kwork *kwork)
>  		}
>  		next = rb_next(next);
>  	}
> -	print_separator(ret);
> +	print_separator(ret, "", 0);
>  
>  	if (kwork->summary) {
>  		print_summary(kwork);
> -		print_separator(ret);
> +		print_separator(ret, "", 0);
>  	}
>  
>  	print_bad_events(kwork);
> diff --git a/tools/perf/util/util.c b/tools/perf/util/util.c
> index 0f031eb80b4c..1b91834e11de 100644
> --- a/tools/perf/util/util.c
> +++ b/tools/perf/util/util.c
> @@ -257,6 +257,12 @@ static int rm_rf_kcore_dir(const char *path)
>  	return 0;
>  }
>  
> +void print_separator(int pre_dash_cnt, const char *s, int post_dash_cnt)
> +{
> +	printf("%.*s%s%.*s\n", pre_dash_cnt, graph_dotted_line, s, post_dash_cnt,
> +	       graph_dotted_line);
> +}

I think it's better to keep the existing interface and add a new one
like print_separator2() for your case.  The old one can be implemented
on top of the new API.

Thanks,
Namhyung

> +
>  int rm_rf_perf_data(const char *path)
>  {
>  	const char *pat[] = {
> diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h
> index 3423778e39a5..de69384380c2 100644
> --- a/tools/perf/util/util.h
> +++ b/tools/perf/util/util.h
> @@ -48,6 +48,8 @@ bool sysctl__nmi_watchdog_enabled(void);
>  
>  int perf_tip(char **strp, const char *dirpath);
>  
> +void print_separator(int pre_dash_cnt, const char *s, int post_dash_cnt);
> +
>  #ifndef HAVE_SCHED_GETCPU_SUPPORT
>  int sched_getcpu(void);
>  #endif
> -- 
> 2.43.0
>