linux-kernel - Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and waiter logic to load balance console writes

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Message-ID: <alpine.LRH.2.00.1804162214260.26111@gjva.wvxbf.pm>
Date:   Mon, 16 Apr 2018 22:17:17 +0200 (CEST)
From:   Jiri Kosina <jikos@...nel.org>
To:     Sasha Levin <Alexander.Levin@...rosoft.com>
cc:     Pavel Machek <pavel@....cz>,
        Linus Torvalds <torvalds@...ux-foundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Petr Mladek <pmladek@...e.com>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        Cong Wang <xiyou.wangcong@...il.com>,
        Dave Hansen <dave.hansen@...el.com>,
        Johannes Weiner <hannes@...xchg.org>,
        Mel Gorman <mgorman@...e.de>, Michal Hocko <mhocko@...nel.org>,
        Vlastimil Babka <vbabka@...e.cz>,
        Peter Zijlstra <peterz@...radead.org>, Jan Kara <jack@...e.cz>,
        Mathieu Desnoyers <mathieu.desnoyers@...icios.com>,
        Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp>,
        Byungchul Park <byungchul.park@....com>,
        Tejun Heo <tj@...nel.org>
Subject: Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and
 waiter logic to load balance console writes

On Mon, 16 Apr 2018, Sasha Levin wrote:

> So if a user is operating a nuclear power plant, and has 2 leds: green 
> one that says "All OK!" and a red one saying "NUCLEAR MELTDOWN!", and 
> once in a blue moon a race condition is causing the red one to go on and 
> cause panic in the little province he lives in, we should tell that user 
> to fuck off?
> 
> LEDs may not be critical for you, but they can be critical for someone
> else. Think of all the different users we have and the wildly different
> ways they use the kernel.

I am pretty sure that for almost every fix there is a person on a planet 
that'd rate it "critical". We can't really use this as an argument for 
inclusion of code into -stable, as that'd mean that -stable and Linus' 
tree would have to be basically the same.

-- 
Jiri Kosina
SUSE Labs