linux-kernel - Re: [PATCH RT] fs: jbd2: pull your plug when waiting for space

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Message-ID: <20140310174718.GB6763@thunk.org>
Date:	Mon, 10 Mar 2014 13:47:18 -0400
From:	Theodore Ts'o <tytso@....edu>
To:	Mike Galbraith <bitbucket@...ine.de>
Cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	Steven Rostedt <rostedt@...dmis.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	linux-rt-users <linux-rt-users@...r.kernel.org>,
	tglx@...utronix.de
Subject: Re: [PATCH RT] fs: jbd2: pull your plug when waiting for space

On Fri, Feb 21, 2014 at 02:54:12PM +0100, Mike Galbraith wrote:
> 
> ext3: dbench1 queues a buffer, blocks on journal mutex, it's plug is not
> pulled.  dbench2 mutex owner is waiting for kjournald, who is waiting for
> the buffer queued by dbench1.  Game over.

Where is in ext3/4 are we calling some function which could end up
blocking on kjournald while we have the I/O queue plugged?  That
sounds suspicious and potentially wrong.

							- Ted
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