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

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20250713001942027bne2UhpkDuiSVPMxA3LZj@zte.com.cn>
Date: Sun, 13 Jul 2025 00:19:42 +0800 (CST)
From: <yang.yang29@....com.cn>
To: <wang.yaxin@....com.cn>, <fan.yu9@....com.cn>
Cc: <bsingharora@...il.com>, <akpm@...ux-foundation.org>, <david@...hat.com>,
        <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
        <linux-doc@...r.kernel.org>, <wang.yong12@....com.cn>,
        <he.peilin@....com.cn>, <tu.qiang35@....com.cn>,
        <qiu.yutan@....com.cn>, <zhang.yunkai@....com.cn>,
        <xu.xin16@....com.cn>, <jiang.kun2@....com.cn>
Subject: Re: [PATCH linux next] delaytop: add psi info to show system delay

> bash# ./delaytop
> System Pressure Information: (avg10/avg60/avg300/total)
> CPU: full: 0.0%/ 0.0%/ 0.0%/0 some: 0.1%/ 0.0%/ 0.0%/14216596
> Memory: full: 0.0%/ 0.0%/ 0.0%/34010659 some: 0.0%/ 0.0%/ 0.0%/35406492
> IO: full: 0.1%/ 0.0%/ 0.0%/51029453 some: 0.1%/ 0.0%/ 0.0%/55330465
> IRQ: full: 0.0%/ 0.0%/ 0.0%/0
I see the unit of PSI and task delay are different, they are microseconds
and milliseconds. We'd better keep the units aligned for better user
understanding.

And what about split the output of each delay into different lines just as
PSI, this help us to better compare the results of some and full.
bash# cat /proc/pressure/cpu 
some avg10=0.00 avg60=0.00 avg300=0.00 total=682581546
full avg10=0.00 avg60=0.00 avg300=0.00 total=0

For example:
bash# ./delaytop
System Pressure Information: (avg10/avg60/avg300/total)
CPU some: 0.1%/ 0.0%/ 0.0%/14216596
CPU full: 0.0%/ 0.0%/ 0.0%/0
Memory some: 0.0%/ 0.0%/ 0.0%/35406492
Memory full: 0.0%/ 0.0%/ 0.0%/34010659