linux-kernel - [RFC PATCH] watchdog: Adding softwatchdog

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Message-ID: <20210424102555.28203-1-peter.enderborg@sony.com>
Date:   Sat, 24 Apr 2021 12:25:54 +0200
From:   Peter Enderborg <peter.enderborg@...y.com>
To:     Wim Van Sebroeck <wim@...ux-watchdog.org>,
        Guenter Roeck <linux@...ck-us.net>,
        Andrew Morton <akpm@...ux-foundation.org>,
        <linux-watchdog@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-mm@...ck.org>, Shakeel Butt <shakeelb@...gle.com>
Subject: [RFC PATCH] watchdog: Adding softwatchdog

First it is not a new softdog.
This adds function that do other actions than a reboot. It intended to be
used to help userspace management and monitoring going but can
be used standalone too.

The idea is to use watchdog interface, instead of reboot, a timer
function do a softer action. In this case it is using oom_score_adj
to pick a task to kill. So this is assuming that watchdog kicker
is not respoding due to high memory pressure. A other usecase might
be a selecting a task from a UID or what ever is problematic,
it does not have to be a memory issue.
But core thing is to have other actions than hard reboot.

The patch need more works, but it can be tested as it is.