linux-kernel - RE: [RFC][PATCH] kmsg

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Message-ID: <987664A83D2D224EAE907B061CE93D530194487CA2@orsmsx505.amr.corp.intel.com>
Date:	Tue, 1 Feb 2011 11:46:46 -0800
From:	"Luck, Tony" <tony.luck@...el.com>
To:	Américo Wang <xiyou.wangcong@...il.com>,
	Seiji Aguchi <seiji.aguchi@....com>
CC:	"rdunlap@...otime.net" <rdunlap@...otime.net>,
	"Yu, Fenghua" <fenghua.yu@...el.com>,
	"tglx@...utronix.de" <tglx@...utronix.de>,
	"mingo@...hat.com" <mingo@...hat.com>,
	"hpa@...or.com" <hpa@...or.com>, "x86@...nel.org" <x86@...nel.org>,
	"tj@...nel.org" <tj@...nel.org>,
	"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>,
	"a.p.zijlstra@...llo.nl" <a.p.zijlstra@...llo.nl>,
	"arnd@...db.de" <arnd@...db.de>,
	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-ia64@...r.kernel.org" <linux-ia64@...r.kernel.org>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	"shiyer@...hat.com" <shiyer@...hat.com>,
	"pjones@...hat.com" <pjones@...hat.com>,
	Satoru Moriya <satoru.moriya@....com>
Subject: RE: [RFC][PATCH] kmsg_dumper for NVRAM

> This looks like what Tony wanted, pstore.

Yes - this looks like another means to the same end (making console log
Available after a crash).

I wonder whether you could use my pstore file system interface
for this ... you'd need to write a backend that used EFI variable
space to save the pieces of a console log, in much the same way
that I used ERST to stash the pieces.

This might be a bit messy - but I think that it would be
worth doing in order to provide a single user interface
to the kmsg_dump on different architectures, regardless
of the underlying storage method used.  I.e. the OS
vendors would just have to write startup scripts to glean
information from /dev/pstore and clear it by removing the
files there. Rather than having one set of scripts that
looks at EFI variables for machines that use that, a different
set for machines that have the sparc64 method of saving in
some special area of ram, and yet another set for a machine
that has some other motherboard magical non volatile storage
that hasn't been designed yet.

-Tony