From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 50093C433F5 for ; Thu, 14 Oct 2021 18:27:14 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 2A83B61037 for ; Thu, 14 Oct 2021 18:27:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229964AbhJNS3S (ORCPT ); Thu, 14 Oct 2021 14:29:18 -0400 Received: from outgoing-auth-1.mit.edu ([18.9.28.11]:35996 "EHLO outgoing.mit.edu" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S229690AbhJNS3R (ORCPT ); Thu, 14 Oct 2021 14:29:17 -0400 Received: from cwcc.thunk.org (pool-72-74-133-215.bstnma.fios.verizon.net [72.74.133.215]) (authenticated bits=0) (User authenticated as tytso@ATHENA.MIT.EDU) by outgoing.mit.edu (8.14.7/8.12.4) with ESMTP id 19EIR8qO000389 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 14 Oct 2021 14:27:09 -0400 Received: by cwcc.thunk.org (Postfix, from userid 15806) id A205C15C00CA; Thu, 14 Oct 2021 14:27:08 -0400 (EDT) Date: Thu, 14 Oct 2021 14:27:08 -0400 From: "Theodore Ts'o" To: secret Cc: linux-kernel@vger.kernel.org Subject: Re: ???UNSURE??? Re: Unwanted activation of root-processes getting highly activated Message-ID: References: <202110141240.12172.andreas-stoewing@web.de> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <202110141240.12172.andreas-stoewing@web.de> Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 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