linux-kernel - Re: Possible netns creation and execution performance/scalability regression since v3.8 due to rcu callbacks being offloaded to multiple cpus

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Message-ID: <874mzrszlk.fsf@x220.int.ebiederm.org>
Date:	Wed, 11 Jun 2014 18:09:27 -0700
From:	ebiederm@...ssion.com (Eric W. Biederman)
To:	Rafael Tinoco <rafael.tinoco@...onical.com>
Cc:	Paul McKenney <paulmck@...ux.vnet.ibm.com>,
	Dave Chiluk <chiluk@...onical.com>,
	linux-kernel@...r.kernel.org, davem@...emloft.net,
	Christopher Arges <chris.j.arges@...onical.com>,
	Jay Vosburgh <jay.vosburgh@...onical.com>
Subject: Re: Possible netns creation and execution performance/scalability regression since v3.8 due to rcu callbacks being offloaded to multiple cpus

Rafael Tinoco <rafael.tinoco@...onical.com> writes:

> I'm getting a kernel panic with your patch:
>
> -- panic
> -- mount_block_root
> -- mount_root
> -- prepare_namespace
> -- kernel_init_freeable
>
> It is giving me an unknown block device for the same config file i
> used on other builds. Since my test is running on a kvm guest under a
> ramdisk, i'm still checking if there are any differences between this
> build and other ones but I think there aren't.
>
> Any chances that "prepare_namespace" might be breaking mount_root ?

My patch boots for me....

Eric
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