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: <20180416163952.GA8740@amd>
Date:   Mon, 16 Apr 2018 18:39:53 +0200
From:   Pavel Machek <pavel@....cz>
To:     Sasha Levin <Alexander.Levin@...rosoft.com>
Cc:     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>
Subject: Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and
 waiter logic to load balance console writes

On Mon 2018-04-16 16:28:00, Sasha Levin wrote:
> On Mon, Apr 16, 2018 at 12:20:19PM -0400, Steven Rostedt wrote:
> >On Mon, 16 Apr 2018 18:06:08 +0200
> >Pavel Machek <pavel@....cz> wrote:
> >
> >> That means you want to ignore not-so-serious bugs, because benefit of
> >> fixing them is lower than risk of the regressions. I believe bugs that
> >> do not bother anyone should _not_ be fixed in stable.
> >>
> >> That was case of the LED patch. Yes, the commit fixed bug, but it
> >> introduced regressions that were fixed by subsequent patches.
> >
> >I agree. I would disagree that the patch this thread is on should go to
> >stable. What's the point of stable if it introduces regressions by
> >backporting bug fixes for non major bugs.
> 
> One such reason is that users will then hit the regression when they
> upgrade to the next -stable version anyways.

Well, yes, testing is required when moving from 4.14 to 4.15. But
testing should not be required when moving from 4.14.5 to 4.14.6.

> >Every fix I make I consider labeling it for stable. The ones I don't, I
> >feel the bug fix is not worth the risk of added regressions.
> >
> >I worry that people will get lazy and stop marking commits for stable
> >(or even thinking about it) because they know that there's a bot that
> >will pull it for them. That thought crossed my mind. Why do I want to
> >label anything stable if a bot will probably catch it. Then I could
> >just wait till the bot posts it before I even think about stable.
> 
> People are already "lazy". You are actually an exception for marking your
> commits.
> 
> Yes, folks will chime in with "sure, I mark my patches too!", but if you
> look at the entire committer pool in the kernel you'll see that most
> don't bother with this to begin with.

So you take everything and put it into stable? I don't think that's a
solution.

If you are worried about people not putting enough "Stable: " tags in
their commits, perhaps you can write them emails "hey, I think this
should go to stable, do you agree"? You should get people marking
their commits themselves pretty quickly...
									
									Pavel

-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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