linux-kernel - Re: [PATCH 1/7 v2] sched/fair: Filter false overloaded

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] [day] [month] [year] [list]

Message-ID: <Z2HNuK_Zyfc2zZ0L@fedora>
Date: Tue, 17 Dec 2024 19:15:12 +0000
From: Dhaval Giani <dhaval@...nis.ca>
To: Vincent Guittot <vincent.guittot@...aro.org>
Cc: mingo@...hat.com, peterz@...radead.org, juri.lelli@...hat.com, dietmar.eggemann@....com, rostedt@...dmis.org, bsegall@...gle.com, mgorman@...e.de, vschneid@...hat.com, lukasz.luba@....com, rafael.j.wysocki@...el.com, linux-kernel@...r.kernel.org, qyousef@...alina.io, hongyan.xia2@....com, pierre.gondois@....com, christian.loehle@....com, qperret@...gle.com
Subject: Re: [PATCH 1/7 v2] sched/fair: Filter false overloaded_group case for EAS

On Tue, Dec 17, 2024 at 05:07:14PM +0100, Vincent Guittot wrote:
> With EAS, a group should be set overloaded if at least 1 CPU in the group
> is overutilized bit it can happen that a CPU is fully utilized by tasks

typo - s/bit/but

> because of clamping the compute capacity of the CPU. In such case, the CPU
> is not overutilized and as a result should not be set overloaded as well.
> 
> group_overloaded being a higher priority than group_misfit, such group can
> be selected as the busiest group instead of a group with a mistfit task
> and prevents load_balance to select the CPU with the misfit task to pull
> the latter on a fitting CPU.
> 
> Signed-off-by: Vincent Guittot <vincent.guittot@...aro.org>
> Tested-by: Pierre Gondois <pierre.gondois@....com>