linux-kernel - Re: [PATCH v4] printk: Add console owner and waiter logic to load balance console writes

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Message-ID: <20171214143412.frjrq4lykjahlqq6@pathway.suse.cz>
Date:   Thu, 14 Dec 2017 15:34:12 +0100
From:   Petr Mladek <pmladek@...e.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
        Byungchul Park <byungchul.park@....com>,
        LKML <linux-kernel@...r.kernel.org>, akpm@...ux-foundation.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>,
        Sergey Senozhatsky <sergey.senozhatsky@...il.com>,
        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>,
        rostedt@...e.goodmis.org, kernel-team@....com
Subject: Re: [PATCH v4] printk: Add console owner and waiter logic to load
 balance console writes

On Tue 2017-12-12 14:27:10, Steven Rostedt wrote:
> On Tue, 12 Dec 2017 14:39:21 +0900
> Sergey Senozhatsky <sergey.senozhatsky.work@...il.com> wrote:
> 
> > p.s.
> > frankly, I don't see any "locking issues" in Steven's patch.
> 
> Should I push out another revision of mine?

I am going to to give some more testing v4 within next few days.
If it works well, I think that it would need just some cosmetic
changes.

For example, it would be nice to somehow encapsulate
the handshake-related code into few helpers. I believe that
it might help us to understand and maintain it. Both
vprintk_emit() and console_unlock() were too long already
before.

Best Regards,
Petr