linux-kernel - Re: [patch 11/29] lockup_detector: Remove park_in

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Message-ID: <20170904121050.dsqbh3efmkteu3qj@hirez.programming.kicks-ass.net>
Date:   Mon, 4 Sep 2017 14:10:50 +0200
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ulrich Obergfell <uobergfe@...hat.com>
Cc:     Thomas Gleixner <tglx@...utronix.de>,
        LKML <linux-kernel@...r.kernel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Borislav Petkov <bp@...en8.de>,
        Sebastian Siewior <bigeasy@...utronix.de>,
        Nicholas Piggin <npiggin@...il.com>,
        Don Zickus <dzickus@...hat.com>,
        Chris Metcalf <cmetcalf@...lanox.com>
Subject: Re: [patch 11/29] lockup_detector: Remove park_in_progress hackery

On Mon, Sep 04, 2017 at 01:09:06PM +0200, Ulrich Obergfell wrote:

> - A thread hogs CPU N (soft lockup) so that watchdog/N is unable to run.
> - A user re-configures 'watchdog_thresh' on the fly. The reconfiguration
>   requires parking/unparking of all watchdog threads.

This is where you fail, its silly to require parking for
reconfiguration.