linux-kernel - Re: ???UNSURE??? Re: Unwanted activation of root-processes getting highly activated

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Message-ID: <YWh2fO8/M82GxXZe@mit.edu>
Date:   Thu, 14 Oct 2021 14:27:08 -0400
From:   "Theodore Ts'o" <tytso@....edu>
To:     secret <andreas-stoewing@....de>
Cc:     linux-kernel@...r.kernel.org
Subject: Re: ???UNSURE??? Re: Unwanted activation of root-processes getting
 highly activated

On Thu, Oct 14, 2021 at 12:40:08PM +0000, secret wrote:
> Hi,
> Firejail must have caused the high activity.
> Whenever I stop it (process firejail), they lower to origin.

This is what I had been trying to tell you repeatedly.  Firejail
(firefox run in a sandbox/jail) is a browser which will do various
activities on behalf of whatever web pages that you visit.  Some of
these webpages may have javascript, or other web-based application
code which is causing a lot of file I/O.  So when visiting that web
page causes firefox to execute a lot of file I/O, on behalf of the web
site, in order to service the file I/O, the kernel will do that work
in the kernel threads that you seem to be objecting to having
activity.

However, those kernel threads being active when there is file I/O is
*normal*.  It is the system working as intended.  I don't know why you
would be objecting to those kernel threads being active, but if you
don't like it, don't do any file I/O, and if that means not using
firefox (or "firejail") to visit those web sites.

Regards,

					- Ted