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

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Message-ID: <79489188-ba79-4f98-bca5-6c64c5f13b38@amd.com>
Date: Fri, 9 Jan 2026 16:53:42 +0530
From: Swapnil Sapkal <swapnil.sapkal@....com>
To: Namhyung Kim <namhyung@...nel.org>
CC: <peterz@...radead.org>, <mingo@...hat.com>, <acme@...nel.org>,
	<irogers@...gle.com>, <james.clark@....com>, <ravi.bangoria@....com>,
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	<linux-kernel@...r.kernel.org>, <linux-perf-users@...r.kernel.org>,
	<santosh.shukla@....com>, <sandipan.das@....com>
Subject: Re: [PATCH RESEND v4 01/11] perf: Add print_separator to util

Hello Namhyung,

On 03-01-2026 03:42, Namhyung Kim wrote:
> Hello,
> 
> Sorry for the delay and happy new year!
> 

No worries at all. Happy new year to you too!

> 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.
> 

Sure, I will update this in the next version.

--
Thanks and Regards,
Swapnil

> 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
>>