linux-kernel - Re: Mysterious CFQ crash and RCU

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Message-ID: <1306318636.9059.33.camel@t41.thuisdomein>
Date:	Wed, 25 May 2011 12:17:16 +0200
From:	Paul Bolle <pebolle@...cali.nl>
To:	paulmck@...ux.vnet.ibm.com
Cc:	Vivek Goyal <vgoyal@...hat.com>, Jens Axboe <jaxboe@...ionio.com>,
	linux kernel mailing list <linux-kernel@...r.kernel.org>
Subject: Re: Mysterious CFQ crash and RCU

> Polling is fine.  Please see attached for a script to poll at 15-second
> intervals.  Please also feel free to adjust, just tell me what you
> adjusted.

0) I have not yet tried this script, but I did have a look at it (to see
what's needed to run it).

1) All debugfs files it polls come from kernel/rcutree_trace.c. That
file is written as a module (and will only be built if
CONFIG_TREE_RCU_TRACE isn't "n"). But in init/Kconfig, the
TREE_RCU_TRACE config entry is set to "def_bool".

2) So shouldn't either the config entry be set to "tristate" or the
module support removed from kernel/rcutree_trace.c?

Paul Bolle

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