linux-kernel - Re: [RFC][PATCH v2 0/3] efi_pstore: avoid losing critical message

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Message-ID: <54552.1342903942@turing-police.cc.vt.edu>
Date:	Sat, 21 Jul 2012 16:52:22 -0400
From:	valdis.kletnieks@...edu
To:	Seiji Aguchi <seiji.aguchi@....com>
Cc:	"linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"Luck, Tony (tony.luck@...el.com)" <tony.luck@...el.com>,
	"mikew@...gle.com" <mikew@...gle.com>,
	"dzickus@...hat.com" <dzickus@...hat.com>,
	"Matthew Garrett (mjg@...hat.com)" <mjg@...hat.com>,
	"dle-develop@...ts.sourceforge.net" 
	<dle-develop@...ts.sourceforge.net>,
	Satoru Moriya <satoru.moriya@....com>
Subject: Re: [RFC][PATCH v2 0/3] efi_pstore: avoid losing critical message

On Thu, 19 Jul 2012 21:11:44 -0000, Seiji Aguchi said:

> [Solution]
>    To avoid losing a critical message, this patchset is based on a following concept.
>      - A basic policy is _not_ to overwrite existing entries.
>
>      - However, if kernel panics while a system is rebooting, a critical message
>        can't be saved by the policy above.
>        (In this case, panic message is critical.)

OK, system boots in "overwrite mode", and when done booting, we go into
"non-overwrite mode".  Makes sense to me.  Only part I'm missing is how/when/why
we leave overwrite mode - what makes the change, and how?

(If I missed an ioctl or /sys entry or something that userspace toggles to say "I'll
take care of it from here", please point me at it and I'll go re-read after I find
some more caffeine ;)

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