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From: Sasha Levin <Alexander.Levin@microsoft.com>
Subject: Re: [PATCH AUTOSEL for 4.14 015/161] printk: Add console owner and
 waiter logic to load balance console writes
Date: Tue, 17 Apr 2018 18:28:27 +0000
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To: Jan Kara <jack@suse.cz>
Cc: Pavel Machek <pavel@ucw.cz>, Steven Rostedt <rostedt@goodmis.org>, Linus Torvalds <torvalds@linux-foundation.org>, Petr Mladek <pmladek@suse.com>, "stable@vger.kernel.org" <stable@vger.kernel.org>, "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>, "akpm@linux-foundation.org" <akpm@linux-foundation.org>, "linux-mm@kvack.org" <linux-mm@kvack.org>, Cong Wang <xiyou.wangcong@gmail.com>, Dave Hansen <dave.hansen@intel.com>, Johannes Weiner <hannes@cmpxchg.org>, Mel Gorman <mgorman@suse.de>, Michal Hocko <mhocko@kernel.org>, Vlastimil Babka <vbabka@suse.cz>, Peter Zijlstra <peterz@infradead.org>, Mathieu Desnoyers <mathieu.desnoyers@efficios.com>, Tetsuo Handa <penguin-kernel@i-love.sakura.ne.jp>, Byungchul Park <byungchul.park@lge.com>, Tejun Heo <tj@kernel.org>

On Tue, Apr 17, 2018 at 07:57:54PM +0200, Jan Kara wrote:
>Actually I was careful enough to include only commits that got merged as
>part of the stable process into 4.14.x but got later reverted in 4.14.y.
>That's where the 0.4% number came from. So I believe all of those cases
>(13 in absolute numbers) were user visible regressions during the stable
>process.

I looked at them, and there are 2 things in play here:

 - Quite a few of those reverts are because of the PTI work. I'm not
   sure how we treat it, but yes - it skews statistics here.
 - 2 of them were reverts for device tree changes for a device that
   didn't exist in 4.14, and shouldn't have had any user visible
   changes.=