linux-kernel - Re: [RFC PATCH 0/7] sched: cpufreq: Remove magic margins

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] [thread-next>] [day] [month] [year] [list]

Message-ID: <20230907132906.GG10955@noisy.programming.kicks-ass.net>
Date:   Thu, 7 Sep 2023 15:29:06 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Lukasz Luba <lukasz.luba@....com>
Cc:     Qais Yousef <qyousef@...alina.io>, linux-kernel@...r.kernel.org,
        linux-pm@...r.kernel.org, "Rafael J. Wysocki" <rafael@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Dietmar Eggemann <dietmar.eggemann@....com>,
        Vincent Guittot <vincent.guittot@...aro.org>,
        Viresh Kumar <viresh.kumar@...aro.org>
Subject: Re: [RFC PATCH 0/7] sched: cpufreq: Remove magic margins

On Thu, Sep 07, 2023 at 02:06:15PM +0100, Lukasz Luba wrote:

> > Many extentions to the periodic task model are possible, including
> > things like average runtime with bursts etc.. all have their trade-offs.
> 
> Was that maybe proposed somewhere on LKML (the other models)?

RT literatur mostly methinks. Replacing WCET with a statistical model of
sorts is not uncommon, the argument goes that not everybody will have
their worst case at the same time and lows and highs can commonly cancel
out and this way we can cram a little more on the system.

Typically this is proposed in the context of soft-realtime systems.