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: <20180409082246.34hgp3ymkfqke3a4@pathway.suse.cz>
Date:   Mon, 9 Apr 2018 10:22:46 +0200
From:   Petr Mladek <pmladek@...e.com>
To:     Sasha Levin <Alexander.Levin@...rosoft.com>
Cc:     "stable@...r.kernel.org" <stable@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "Steven Rostedt (VMware)" <rostedt@...dmis.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>,
        Linus Torvalds <torvalds@...ux-foundation.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 Mon 2018-04-09 00:19:53, Sasha Levin wrote:
> From: "Steven Rostedt (VMware)" <rostedt@...dmis.org>
> 
> [ Upstream commit dbdda842fe96f8932bae554f0adf463c27c42bc7 ]
> 
> This patch implements what I discussed in Kernel Summit. I added
> lockdep annotation (hopefully correctly), and it hasn't had any splats
> (since I fixed some bugs in the first iterations). It did catch
> problems when I had the owner covering too much. But now that the owner
> is only set when actively calling the consoles, lockdep has stayed
> quiet.

Same here. I do not thing that this is a material for stable backport.
More details can be found in my reply to the patch for 4.15, see
https://lkml.kernel.org/r/20180409081535.dq7p5bfnpvd3xk3t@pathway.suse.cz

Best Regards,
Petr

PS: I wonder how much time you give people to react before releasing
this. The number of autosel mails is increasing and I am involved
only in very small amount of them. I wonder if some other people
gets overwhelmed by this.