Subject: Re: Mysterious CFQ crash and RCU
From: Paul Bolle <pebolle@tiscali.nl>
To: paulmck@linux.vnet.ibm.com
Cc: Vivek Goyal <vgoyal@redhat.com>, Jens Axboe <jaxboe@fusionio.com>,
        linux kernel mailing list <linux-kernel@vger.kernel.org>
Date: Wed, 25 May 2011 12:17:16 +0200
In-Reply-To: <20110523153848.GC2310@linux.vnet.ibm.com>
References: <20110519222404.GG12600@redhat.com>
	 <20110521210013.GJ2271@linux.vnet.ibm.com>
	 <20110523152141.GB4019@redhat.com>
	 <20110523153848.GC2310@linux.vnet.ibm.com>
Content-Type: text/plain; charset="UTF-8"
Content-Transfer-Encoding: 7bit
Message-ID: <1306318636.9059.33.camel@t41.thuisdomein>
Mime-Version: 1.0
Sender: linux-kernel-owner@vger.kernel.org
Content-Length: 869
Lines: 23

> 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

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/