linux-kernel - Re: [PATCH linux-next] delayacct: improve the average delay precision of getdelay tool to microsecond

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Message-ID: <ZAAOa4nYSYQc48Lr@debian.me>
Date:   Thu, 2 Mar 2023 09:48:11 +0700
From:   Bagas Sanjaya <bagasdotme@...il.com>
To:     yang.yang29@....com.cn, akpm@...ux-foundation.org, david@...hat.com
Cc:     linux-kernel@...r.kernel.org, linux-mm@...ck.org,
        linux-doc@...r.kernel.org, wang.yong12@....com.cn
Subject: Re: [PATCH linux-next] delayacct: improve the average delay
 precision of getdelay tool to microsecond

On Mon, Feb 13, 2023 at 02:08:08PM +0800, yang.yang29@....com.cn wrote:
> From: Wang Yong <wang.yong12@....com.cn>
> 
> Improve the average delay precision of getdelay tool to microsecond.
> When using the getdelay tool, it is sometimes found that the average
> delay except CPU is not 0, but display is 0, because the precison is too
> low. For example, see delay average of SWAP below when using ZRAM.
> 
> print delayacct stats ON
> PID	32915
> CPU             count     real total  virtual total    delay total  delay average
>                339202     2793871936     9233585504        7951112          0.000ms
> IO              count    delay total  delay average
>                    41      419296904             10ms
> SWAP            count    delay total  delay average
>                242589     1045792384              0ms
> This wrong display is misleading, so improve the millisecond precision
> of the  average delay to microsecond just like CPU. Then user would
> get more accurate information of delay time.

I'm kinda confused. 0.000ms is same as 0ms, right?

And did you mean accuracy of delay average is to be same as CPU time?

-- 
An old man doll... just what I always wanted! - Clara

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