linux-kernel - Re: [patch] add kdump_after

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Message-ID: <20070814085324.GB19512@suse.de>
Date:	Tue, 14 Aug 2007 10:53:24 +0200
From:	Bernhard Walle <bwalle@...e.de>
To:	Takenori Nagano <t-nagano@...jp.nec.com>
Cc:	vgoyal@...ibm.com, Keith Owens <kaos@....com>,
	"Eric W. Biederman" <ebiederm@...ssion.com>,
	k-miyoshi@...jp.nec.com, kexec@...ts.infradead.org,
	linux-kernel@...r.kernel.org,
	Andrew Morton <akpm@...ux-foundation.org>
Subject: Re: [patch] add kdump_after_notifier

* Takenori Nagano <t-nagano@...jp.nec.com> [2007-08-14 10:48]:
> Bernhard Walle wrote:
> > * Takenori Nagano <t-nagano@...jp.nec.com> [2007-08-14 10:34]:
> >> Vivek Goyal wrote:
> >>> On Fri, Aug 03, 2007 at 02:05:47PM +1000, Keith Owens wrote:
> >>>
> >>>
> >>> To sum up, couple of options come to mind.
> >>>
> >>> - Register all the RAS tools on die notifier and panic
> >>>   notifier lists with fairly high priority. Export list
> >>>   of RAS tools to user space and allow users to decide the
> >>>   order of execution and priority of RAS tools.
> >>>
> >>> - Create a separate RAS tool notifier list (ras_tool_notifer_list).
> >>>   All the RAS tools register on this list. This list gets priority
> >>>   over die or panic notifier list. User decides the oder of execution
> >>>   of RAS tools. 
> >>>
> >>>   Here assumption is that above list will not be exported to modules.
> >>>   All the RAS tools will be in kernel and they always get a priority
> >>>   to inspect an event.
> >>>
> >>> What do others think?
> >> Very good idea. But there is a problem how to give default priority to RAS tools.
> >>
> >> How about priority changeable notifier_list? User can change list order
> >> dynamically if they want. Of course, we have to give highest priority to kdump
> >> by default. It is very useful for users who want to use some RAS tools.
> > 
> > I think that was the idea of the first “-” (“export list of RAS tools
> > to user space”).
> 
> Ah, sorry.
> 
> I think first idea is very good. How export the list? (sysfs? procfs?)

I think sysfs would be a good solution, e.g. assigning each RAS tool a
priority from 0 to 100 or something like this.


Thanks,
   Bernhard
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