linux-kernel - Re: power-off delay/hang due to commit 6d25be57 (mainline)

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]

Date:   Mon, 04 Jan 2021 16:38:43 +0100
From:   Stephen Berman <stephen.berman@....net>
To:     "Rafael J. Wysocki" <rjw@...ysocki.net>
Cc:     Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        Zhang Rui <rui.zhang@...el.com>,
        Robert Moore <robert.moore@...el.com>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Len Brown <lenb@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Peter Zijlstra <peterz@...radead.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        "open list:ACPI COMPONENT ARCHITECTURE (ACPICA)" <devel@...ica.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>
Subject: Re: power-off delay/hang due to commit 6d25be57 (mainline)

On Thu, 31 Dec 2020 21:46:11 +0100 "Rafael J. Wysocki" <rjw@...ysocki.net> wrote:

> ATM, I'm tempted to do something like the patch below (with the rationale
> that it shouldn't be necessary to read the temperature right after updating
> the trip points if polling is in use, because the next update through polling
> will cause it to be read anyway and it will trigger trip point actions as
> needed).
>
> Stephen, can you give it a go, please?

On Sat, 02 Jan 2021 12:03:17 +0100 "Rafael J. Wysocki" <rjw@...ysocki.net> wrote:

> There is one more way to address this, probably better: instead of checking the
> temperature right away in acpi_thermal_notify(), queue that on acpi_thermal_pm_queue
> and so only if another thermal check is not pending.
>
> This way there will be at most one temperature check coming from
> acpi_thermal_notify() queued up at any time which should prevent the
> build-up of work items from taking place.
>
> So something like this:

Thanks for the patches.  I'll try them as soon as I can.

Steve Berman