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: <20180419150954.GC2341@sasha-vm>
Date:   Thu, 19 Apr 2018 15:09:56 +0000
From:   Sasha Levin <Alexander.Levin@...rosoft.com>
To:     Thomas Backlund <tmb@...eia.org>
CC:     Greg KH <gregkh@...uxfoundation.org>,
        Steven Rostedt <rostedt@...dmis.org>,
        Linus Torvalds <torvalds@...ux-foundation.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>, Pavel Machek <pavel@....cz>
Subject: Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and
 waiter logic to load balance console writes

On Thu, Apr 19, 2018 at 06:04:26PM +0300, Thomas Backlund wrote:
>Den 19.04.2018 kl. 16:59, skrev Greg KH:
>>Anyway, we are trying not to do this, but it does, and will,
>>occasionally happen.  Look, we just did that for one platform for
>>4.9.94!  And the key to all of this is good testing, which we are now
>>doing, and hopefully you are also doing as well.
>
>Yeah, but having to test stuff with known breakages is no fun, so we 
>try to avoid that

Known breakages are easier to deal with than unknown ones :)

I think that that "bug compatability" is basically a policy on *which*
regressions you'll see vs *if* you'll see a regression.

We'll never pull in a commit that introduces a bug but doesn't fix
another one, right? So if you have to deal with a regression anyway,
might as well deal with a regression that is also seen on mainline, so
that when you upgrade your stable kernel you'll keep the same set of
regressions to deal with.