linux-kernel - Re: [PATCH 01/23 -v6] printk - dont wakeup klogd with interrupts disabled

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Message-ID: <Pine.LNX.4.58.0801260802330.16244@gandalf.stny.rr.com>
Date:	Sat, 26 Jan 2008 08:03:23 -0500 (EST)
From:	Steven Rostedt <rostedt@...dmis.org>
To:	Peter Zijlstra <a.p.zijlstra@...llo.nl>
cc:	LKML <linux-kernel@...r.kernel.org>, Ingo Molnar <mingo@...e.hu>,
	Linus Torvalds <torvalds@...ux-foundation.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Christoph Hellwig <hch@...radead.org>,
	Mathieu Desnoyers <mathieu.desnoyers@...ymtl.ca>,
	Gregory Haskins <ghaskins@...ell.com>,
	Arnaldo Carvalho de Melo <acme@...stprotocols.net>,
	Thomas Gleixner <tglx@...utronix.de>,
	Tim Bird <tim.bird@...sony.com>,
	Sam Ravnborg <sam@...nborg.org>,
	"Frank Ch. Eigler" <fche@...hat.com>,
	Jan Kiszka <jan.kiszka@...mens.com>,
	John Stultz <johnstul@...ibm.com>,
	Arjan van de Ven <arjan@...radead.org>,
	Pavel Machek <pavel@....cz>,
	Steven Rostedt <srostedt@...hat.com>
Subject: Re: [PATCH 01/23 -v6] printk - dont wakeup klogd with interrupts
 disabled


On Sat, 26 Jan 2008, Peter Zijlstra wrote:
>
> Right, while this might appear to be sound, I hate to point out that we
> only want to exclude it when current holds the rq->lock. This could lead
> to spuriously missing klogd wakeups because other cpus hold our
> rq->lock.

Hmm, good point. Not hard to solve ;-)

>
> Now, is this klogd thing only relevant for dumping stuff into the log,
> or also for writing stuff out to the serial line?

It's only responsible for the log (userland stuff).

-- Steve

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