linux-kernel - Re: [PATCH linux next] delaytop: add psi info to show system delay

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Message-ID: <6a4de937-f433-41c9-9c28-2f46070a3cbe@web.de>
Date: Sat, 12 Jul 2025 19:33:31 +0200
From: Markus Elfring <Markus.Elfring@....de>
To: Fan Yu <fan.yu9@....com.cn>, Jiang Kun <jiang.kun2@....com.cn>,
 Wang Yaxin <wang.yaxin@....com.cn>, linux-mm@...ck.org
Cc: LKML <linux-kernel@...r.kernel.org>, linux-doc@...r.kernel.org,
 Andrew Morton <akpm@...ux-foundation.org>,
 Balbir Singh <bsingharora@...il.com>, David Hildenbrand <david@...hat.com>,
 Peilin He <he.peilin@....com.cn>, tu.qiang35@....com.cn,
 Wang Yong <wang.yong12@....com.cn>, xu xin <xu.xin16@....com.cn>,
 Yang Yang <yang.yang29@....com.cn>, Yunkai Zhang <zhang.yunkai@....com.cn>,
 Yutan Qiu <qiu.yutan@....com.cn>
Subject: Re: [PATCH linux next] delaytop: add psi info to show system delay

> support showing whole delay of system by reading PSI,
> just like the first few lines of information output
> by the top command. the output of delaytop includes
…

You may occasionally put more than 53 characters into text lines
of such a change description.


…
> +++ b/tools/accounting/delaytop.c
…
> @@ -549,7 +659,29 @@ static void display_results(void)
>  	FILE *out = stdout;
> 
>  	fprintf(out, "\033[H\033[J");
> -
> +	/* PSI output (one-line, no cat style) */
> +	fprintf(out, "System Pressure Information: ");
> +	fprintf(out, "(avg10/avg60/avg300/total)\n");
> +	fprintf(out, "CPU:");
…

Under which circumstances would you care more also for file output failures?
https://cwe.mitre.org/data/definitions/252.html

Regards,
Markus