How to stop logging in dmesg (kernel ring buffer)?

[Girish Bopaiah]

Hi All,

The below code fills up the log file  dmesg 

drivers/usb/host/ehci-q.c  (qh_completions())

ehci_dbg(ehci,

  "detected XactErr len %zu/%zu retry %d\n",

  qtd->length - QTD_LENGTH(token), qtd->length, qh->xacterrs);

The problem is,  it fills up the swlog .

 

My log levels are as below

cat /proc/sys/kernel/printk

4       3       1       4

 

The severity in code is ehci_dbg which is debug(7)

 

May I know why still the logs are printed in swlog/dmesg?

How to stop it from printing in swlog ?

 

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Regards,
Girish

[Anil Kumar Pugalia]

Console log level is to decide whether to print on console or not. Everything will always go to the ring buffer.

Regards
Anil

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Girish Bopaiah wrote on 01/06/22 10:24 pm:

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[Girish Bopaiah]

Is there a way to stop logging to the ring buffer?  

Some logging we need only for debugging purpose and not all the time 

That is, can user control logging ?

Right now I used printk_once  to avoid ring buffer getting full.

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Regards,
Girish

[Anil Kumar Pugalia]

That is one way. One other thing you can do is use dynamic printing, which prints only when enabled.

Regards
Anil

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Girish Bopaiah wrote on 07/06/22 9:56 am:

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[Girish Bopaiah]

Thank you Sir.

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Regards,
Girish