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

From: Steven Rostedt <rostedt@goodmis.org>
To: LKML <linux-kernel@vger.kernel.org>
Cc: akpm@linux-foundation.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>,
	Petr Mladek <pmladek@suse.com>,
	Sergey Senozhatsky <sergey.senozhatsky@gmail.com>,
	Vlastimil Babka <vbabka@suse.cz>,
	"yuwang.yuwang\"    <yuwang.yuwang@alibaba-inc.com>,
	Peter Zijlstra  <peterz@infradead.org>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Jan  Kara <jack@suse.cz>,
	Mathieu Desnoyers <mathieu.desnoyers@efficios.com>,
	 Tetsuo Handa   <penguin-kernel@I-love.SAKURA.ne.jp>,
	 rostedt@home.goodmis.org"@kvack.org
Subject: Re: [PATCH v4] printk: Add console owner and waiter logic to load balance console writes
Date: Wed, 8 Nov 2017 10:10:57 -0500	[thread overview]
Message-ID: <20171108101057.4e97247d@gandalf.local.home> (raw)
In-Reply-To: <20171108100321.5f3e05c8@gandalf.local.home>

On Wed, 8 Nov 2017 10:03:21 -0500
Steven Rostedt <rostedt@goodmis.org> wrote:

> +		/*
> +		 * If there is a waiter waiting for us, then pass the
> +		 * rest of the work load over to that waiter.
> +		 */
> +		if (waiter)
> +			break;
> +

And if we are worried about flushing on crashes, we could change this
to:

	if (waiter) {
		if (oops_in_progress)
			waiter = false;
		else
			break;
	}

And keep whoever is printing printing if a crash is happening.

-- Steve

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