linux-kernel - Re: [PATCH V3] kmsg_dump: Don't run on non-error paths by default

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Date:	Tue, 14 Feb 2012 19:23:00 +0000
From:	Matthew Garrett <mjg@...hat.com>
To:	akpm@...ux-foundation.org
Cc:	linux-kernel@...r.kernel.org, dzickus@...hat.com,
	vgoyal@...hat.com, seiji.aguchi@....com
Subject: Re: [PATCH V3] kmsg_dump: Don't run on non-error paths by default

On Fri, Feb 10, 2012 at 10:45:15AM -0500, Matthew Garrett wrote:
> Since 04c6862c055fb687c90d9652f32c11a063df15cf kmsg_dump() gets run on
> normal paths including poweroff and reboot. This is less than ideal given
> pstore implementations that can only represent single backtraces, since a
> reboot may overwrite a stored oops before it's been picked up by userspace.
> In addition, some pstore backends may have low performance and provide a
> significant delay in reboot as a result.
> 
> This patch adds a printk.always_kmsg_dump kernel parameter (which can also
> be changed from userspace). Without it, the code will only be run on
> failure paths rather than on normal paths. The option can be enabled in
> environments where there's a desire to attempt to audit whether or not
> a reboot was cleanly requested or not.

Anyone? Whose tree should this go through?

-- 
Matthew Garrett | mjg59@...f.ucam.org
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